Methotrexate Injection USP 250mg/10ml Taj Pharma
- NAME OF THE MEDICINAL PRODUCT
Methotrexate 50mg/ 2ml Injection Taj Pharma
Methotrexate 250mg/ 10ml Injection Taj Pharma
Methotrexate 1000mg/ 10ml Injection Taj Pharma
- QUALITATIVE AND QUANTITATIVE COMPOSITION
Methotrexate 50mg/ 2ml Injection Taj Pharma
a) Each vial contains:
Methotrexate BP 25mg
Sodium chloride 0.490% w/v
Hydrochloric acid may be used as pH adjuster
Methotrexate 250mg/ 10ml Injection Taj Pharma
b) Each vial contains:
Methotrexate BP 25mg
Sodium chloride 0.490% w/v
Hydrochloric acid may be used as pH adjuster
Methotrexate 1000mg/ 10ml Injection Taj Pharma
c) Each vial contains:
Methotrexate BP 100mg
Sodium chloride 0.490% w/v
Hydrochloric acid may be used as pH adjuster
For excipients, see 6.1.
- PHARMACEUTICAL FORM
Solution for Injection
Vials containing a clear yellow solution
- CLINICAL PARTICULARS
4.1 Therapeutic indications
Methotrexate is indicated in the treatment of neoplastic disease, such as trophoblastic neoplasms and leukaemia, and the symptomatic treatment of severe recalcitrant disabling psoriasis which is not adequately responsive to other forms of therapy.
4.2 Posology and method of administration
Adults and children
Antineoplastic Chemotherapy
Methotrexate is active orally and parenterally. Methotrexate Injection may be given by the intramuscular, intravenous, intraarterial or intrathecal routes.
Note: Only the 50 mg/2 ml presentation should be used for the intrathecal route of administration to prevent accidental overdose.
Dosage is related to the patient’s body weight or surface area. Methotrexate has been used with beneficial effect in a wide variety of neoplastic diseases, alone and in combination with other cytotoxic agents.
Choriocarcinoma and Similar Trophoblastic Diseases
Methotrexate is administered orally or intramuscularly in doses of 15-30 mg daily for a 5 day course. Such courses may be repeated 3-5 times as required, with rest periods of one or more weeks interposed between courses until any manifesting toxic symptoms subside.
The effectiveness of therapy can be evaluated by 24 hours quantitative analysis of urinary chorionic gonadotrophin hormone (HCG). Combination therapy with other cytotoxic drugs, has also been reported as useful.
Hydatidiform mole may precede or be followed by choriocarcinoma, and methotrexate has been used in similar doses for the treatment of hydatidiform mole and chorioadenoma destruens
Breast Carcinoma
Prolonged cyclic combination with cyclophosphamide, methotrexate and fluorouracil has given good results when used as adjuvant treatment to radical mastectomy in primary breast cancer with positive axillary lymph nodes. Methotrexate dosage was 40 mg/m2intravenously on the first and eighth days.
Leukaemia
Acute granulocytic leukaemia is rare in children but common in adults and this form of leukaemia responds poorly to chemotherapy.
Methotrexate is not generally a drug of choice for induction of remission of lymphoblastic leukaemia. Oral methotrexate dosage 3.3 mg/m2 daily, and prednisolone 40-60 mg/m2 daily for 4-6 weeks has been used. After a remission is attained, methotrexate in a maintenance dosage of 20-30 mg/m2 orally or by intramuscular injection has been administered twice weekly. Twice weekly doses appear to be more effective than daily drug administration. Alternatively, 2.5 mg/kg has been administered intravenously every 14 days.
Meningeal Leukaemia
Some patients with leukaemia are subject to leukaemic invasions of the central nervous system and the CSF should be examined in all leukaemia patients.
Passage of methotrexate from blood to the cerebrospinal fluid is minimal and for adequate therapy the drug should be administered intrathecally. Methotrexate may be given in a prophylactic regimen in all cases of lymphocytic leukaemia. The dose of intrathecal Methotrexate is constant regardless of age or body surface area in patients over the age of 3 years of age, the maximum intrathecal dose should be 12 mg in such patients. Patients under the age of 3 years should be treated in accordance with combination chemotherapy protocols. The administration is at weekly intervals and is usually repeated until the cell count of cerebrospinal fluid returns to normal. At this point one additional dose is advised. Large doses may cause convulsions and untoward side effects may occur as with any intrathecal injection, and are commonly neurological in character.
Note: Only the 50 mg/2 ml presentation should be used for the intrathecal route of administration to prevent accidental overdose.
Lymphomas
In Burkitt’s Tumour, stages 1-2, methotrexate has prolonged remissions in some cases. Recommended dosage is 10-25 mg per day orally for 4 to 8 days. In stage 3, methotrexate is commonly given concomitantly with other antitumour agents. Treatment in all stages usually consists of several courses of the drug interposed with 7 to 10 day rest periods, and in stage 3 they respond to combined drug therapy with methotrexate given in doses of 0.625 mg to 2.5 mg/kg daily. Hodgkin’s disease responds poorly to methotrexate and to most types of chemotherapy.
Mycosis Fungoides
Therapy with methotrexate appears to produce clinical remissions in one half of the cases treated. Recommended dosage is usually 2.5 to 10 mg daily by mouth for weeks or months and dosage should be adjusted according to the patient’s response and haematological monitoring. Methotrexate has also been given intramuscularly in doses of 50 mg once weekly or 25 mg twice weekly.
Psoriasis Chemotherapy
Cases of severe uncontrolled psoriasis, unresponsive to conventional therapy, have responded to weekly single, oral, intramuscular or intravenous doses of 10-25 mg per week, and adjusted according to the patient’s response. An initial test dose one week prior to initiation of therapy is recommended to detect any idiosyncrasy. A suggested dose range is 5-10 mg.
An alternative dosage schedule consists of 2.5 to 5 mg of methotrexate administered orally at 12 hour intervals for 3 doses each week or at 8-hour intervals for 4 doses each week; weekly dosages should not exceed 30 mg.
A daily oral dosage schedule of 2 to 5 mg administered orally for 5 days followed by a rest period of at least 2 days may also be used. The daily dose should not exceed 6.25 mg.
The patient should be fully informed of the risks involved and the clinician should pay particular attention to the appearance of liver toxicity by carrying out liver function tests before starting methotrexate treatment, and repeating these at 2 to 4 month intervals during therapy. The aim of therapy should be to reduce the dose to the lowest possible level with the longest possible rest period. The use of methotrexate may permit the return to conventional topical therapy which should be encouraged.
Use in the elderly
Methotrexate should be used with extreme caution in elderly patients. A reduction in dosage should be considered.
4.3 Contraindications
Methotrexate is contraindicated in:
Patients with significantly impaired renal function.
Patients with significantly impaired hepatic function
Patients with pre-existing blood dyscrasias, such as significant marrow hypoplasia, leukopenia, thrombocytopenia or anaemia.
Patients with active infections.
Patients with overt or laboratory evidence of immunodeficiency syndrome(s).
Methotrexate is contraindicated in pregnancy.
Because of the potential for serious adverse reactions from methotrexate in breast fed infants, breast feeding is contraindicated in women taking methotrexate.
Patients with a known allergic hypersensitivity to methotrexate or any of the other ingredients should not receive methotrexate.
4.4 Special Warnings and precautions for use
WARNINGS
Methotrexate must be used only by physicians experienced in antimetabolite chemotherapy.
Because of the possibility of fatal or severe toxic reactions, the patient should be fully informed by the physician of the risks involved and be under his constant supervision.
Only the 50 mg/2 ml presentation Methotrexate 25 mg/ml Injection should be used for the intrathecal route of administration. Larger presentations are not suitable due to the risk of accidental overdose.
Acute or chronic interstitial pneumonitis, often associated with blood eosinophilia, may occur and deaths have been reported. Symptoms typically include dyspnoea, cough (especially a dry non-productive cough) thoracic pain and fever for which patients should be monitored at each follow-up visit. Patients should be informed of the risk of pneumonitis and advised to contact their doctor immediately should they develop persistent cough or dyspnoea.
Methotrexate should be withdrawn from patients with pulmonary symptoms and a thorough investigation should be made to exclude infection. If methotrexate induced lung disease is suspected treatment with corticosteroids should be initiated and treatment with methotrexate should not be restarted.
When a patient presents with pulmonary symptoms, the possibility of Pneumocystis carinii pneumonia should be considered.
Methotrexate has the potential for serious, sometimes fatal toxicity. The toxic effects may be related in frequency and severity to the dose or frequency of administration but have been seen at all doses. Because the toxic reactions can occur at any time during therapy, the patients have to be observed closely and must be informed of early signs and symptoms of toxicity.
Use caution when administering high-dose methotrexate to patients receiving proton pump inhibitor (PPI) therapy. Case reports and published population pharmacokinetic studies suggest that concomitant use of some PPIs, such as omeprazole, esomeprazole, and pantoprazole, with methotrexate (primarily at high dose), may elevate and prolong serum levels of methotrexate and/or its metabolite hydroxymethotrexate, possibly leading to methotrexate toxicities. In two of these cases, delayed methotrexate elimination was observed when high-dose methotrexate was co-administered with PPIs, but was not observed when methotrexate was co-administered with ranitidine. However, no formal drug interaction studies of methotrexate with ranitidine have been conducted.
Deaths have been reported with the use of methotrexate in the treatment of psoriasis.
In the treatment of psoriasis, methotrexate should be restricted to severe recalcitrant, disabling psoriasis which is not adequately responsive to other forms of therapy, but only when the diagnosis has been established by biopsy and/or after dermatological consultation.
- Full blood counts should be closely monitored before, during and after treatment. If a clinically significant drop in white-cell or platelet count develops, methotrexate should be withdrawn immediately. Patients should be advised to report all symptoms or signs suggestive of infection.
- Methotrexate may be hepatotoxic, particularly at high dosage or with prolonged therapy. Liver atrophy, necrosis, cirrhosis, fatty changes, and periportal fibrosis have been reported. Since changes may occur without previous signs of gastrointestinal or haematological toxicity, it is imperative that hepatic function be determined prior to initiation of treatment and monitored regularly throughout therapy. If substantial hepatic function abnormalities develop, methotrexate dosing should be suspended for at least 2 weeks. Special caution is indicated in the presence of pre-existing liver damage or impaired hepatic function. Concomitant use of other drugs with hepatotoxic potential (including alcohol) should be avoided.
- Methotrexate has been shown to be teratogenic; it has caused foetal death and/or congenital anomalies. Therefore it is not recommended in women of childbearing potential unless there is appropriate medical evidence that the benefits can be expected to outweigh the considered risks. Pregnant psoriatic patients should not receive methotrexate.
- Renal function should be closely monitored before, during and after treatment. Caution should be exercised if significant renal impairment is disclosed. Reduce dose of methotrexate in patients with renal impairment. High doses may cause the precipitation of methotrexate or its metabolites in the renal tubules. A high fluid throughput and alkalinisation of the urine to pH 6.5 – 7.0, by oral or intravenous administration of sodium bicarbonate (5 x 625 mg tablets every three hours) or acetazolamide (500 mg orally four times a day) is recommended as a preventative measure. Methotrexate is excreted primarily by the kidneys. Its use in the presence of impaired renal function may result in accumulation of toxic amounts or even additional renal damage.
- Diarrhoea and ulcerative stomatitis are frequent toxic effects and require interruption of therapy, otherwise haemorrhagic enteritis and death from intestinal perforation may occur.
- Methotrexate affects gametogenesis during the period of its administration and may result in decreased fertility which is thought to be reversible on discontinuation of therapy. Conception should be avoided during the period of methotrexate administration and for at least 6 months thereafter. Patients and their partners should be advised to this effect.
- Methotrexate has some immunosuppressive activity and immunological responses to concurrent vaccination may be decreased. The immunosuppressive effect of methotrexate should be taken into account when immune responses of patients are important or essential. Immunisation with live virus vaccines is generally not recommended.
- Pleural effusions and ascites should be drained prior to initiation of methotrexate therapy.
- Deaths have been reported with the use of methotrexate. Serious adverse reactions including deaths have been reported with concomitant administration of methotrexate (usually in high doses) along with some non-steroidal anti-inflammatory drugs (NSAIDs).
- Concomitant administration of folate antagonists such as trimethoprim/sulphamethoxazole has been reported to cause an acute megaloblastic pancytopenia in rare instances.
- Systemic toxicity may occur following intrathecal administration. Blood counts should be monitored closely.
- A chest X-ray is recommended prior to initiation of methotrexate therapy.
- If acute methotrexate toxicity occurs, patients may require folinic acid.
- Severe, occasionally fatal, cutaneous or sensitivity reactions (e.g., toxic epidermic necrolysis, Stevens-Johnson syndrome, exfoliative dermatitis, skin necrosis, erythema multiforme, vasculitis and extensive herpetiform skin eruptions) may occur after the administration of methotrexate and recovery ensured mostly after discontinuation of the therapy.
PRECAUTIONS
Methotrexate has a high potential toxicity, usually dose related, and should be used only by physicians experienced in antimetabolite chemotherapy, in patients under their constant supervision. The physician should be familiar with the various characteristics of the drug and its established clinical usage.
Before beginning methotrexate therapy or reinstituting methotrexate after a rest period, assessment of renal function, liver function and blood elements should be made by history, physical examination and laboratory tests.
It should be noted that intrathecal doses are transported into the cardiovascular system and may give rise to systemic toxicity. Systemic toxicity of methotrexate may also be enhanced in patients with renal dysfunction, ascites, or other effusions due to prolongation of serum half-life.
In rare cases, following intrathecal administration, a tumour lysis syndrome has been observed.
Carcinogenesis, mutagenesis, and impairment of fertility: Animal carcinogenicity studies have demonstrated methotrexate to be free of carcinogenic potential. Although methotrexate has been reported to cause chromosomal damage to animal somatic cells and bone marrow cells in humans, these effects are transient and reversible. In patients treated with methotrexate, evidence is insufficient to permit conclusive evaluation of any increased risk of neoplasia.
Methotrexate has been reported to cause impairment of fertility, oligospermia, menstrual dysfunction and amenorrhoea in humans, during and for a short period after cessation of therapy. In addition, methotrexate causes embryotoxicity, abortion and foetal defects in humans. Therefore the possible risks of effects on reproduction should be discussed with patients of childbearing potential (see ‘Warnings’).
Patients undergoing therapy should be subject to appropriate supervision so that signs or symptoms of possible toxic effects or adverse reactions may be detected and evaluated with minimal delay. Pretreatment and periodic haematological studies are essential to the use of methotrexate in chemotherapy because of its common effect of haematopoietic suppression. This may occur abruptly and on apparent safe dosage, and any profound drop in blood cell count indicates immediate stopping of the drug and appropriate therapy. In patients with malignant disease who have pre-existing bone marrow aplasia, leukopenia, thrombocytopenia or anaemia, methotrexate should be used with caution, if at all.
In general, the following laboratory tests are recommended as part of essential clinical evaluation and appropriate monitoring of patients chosen for or receiving methotrexate therapy: complete haemogram; haematocrit; urinalysis; renal function tests; liver function tests and chest X-ray.
The purpose is to determine any existing organ dysfunction or system impairment. The tests should be performed prior to therapy, at appropriate periods during therapy and after termination of therapy.
Liver biopsy may be considered after cumulative doses >1.5 g have been given, if hepatic impairment is suspected.
Methotrexate is bound in part to serum albumin after absorption, and toxicity may be increased because of displacement by certain drugs such as salicylates, sulphonamides, phenytoin, and some antibacterials such as tetracycline, chloramphenicol and para-aminobenzoic acid. These drugs, especially salicylates and sulphonamides, whether antibacterial, hypoglycaemic or diuretic, should not be given concurrently until the significance of these findings is established.
Vitamin preparations containing folic acid or its derivatives may alter response to methotrexate.
Methotrexate should be used with extreme caution in the presence of infection, peptic ulcer, ulcerative colitis, debility, and in extreme youth and old age. If profound leukopenia occurs during therapy, bacterial infection may occur or become a threat. Cessation of the drug and appropriate antibiotic therapy is usually indicated. In severe bone marrow depression, blood or platelet transfusions may be necessary.
Since it is reported that methotrexate may have an immunosuppressive action, this factor must be taken into consideration in evaluating the use of the drug where immune responses in a patient may be important or essential.
In all instances where the use of methotrexate is considered for chemotherapy, the physician must evaluate the need and usefulness of the drug against the risks of toxic effects or adverse reactions. Most such adverse reactions are reversible if detected early. When such effects or reactions do occur, the drug should be reduced in dosage or discontinued and appropriate corrective measures should be taken according to the clinical judgement of the physician. Reinstitution of methotrexate therapy should be carried out with caution, with adequate consideration of further need for the drug and alertness as to the possible recurrence of toxicity.
Methotrexate given concomitantly with radiotherapy may increase the risk of soft tissue necrosis and osteonecrosis.
4.5 Interaction with other medicinal products and other forms of interaction
Methotrexate is extensively protein bound and may be displaced by certain drugs such as salicylates, hypoglycaemics, diuretics, sulphonamides, diphenylhydantoins, tetracyclines, chloramphenicol and p-aminobenzoic acid, and the acidic anti-inflammatory agents, so causing a potential for increased toxicity when used concurrently.
Concomitant use of other drugs with nephrotoxic or hepatotoxic potential (including alcohol) should be avoided.
Vitamin preparations containing folic acid or its derivatives may decrease the effectiveness of methotrexate.
Caution should be used when NSAIDs and salicylates are administered concomitantly with methotrexate. These drugs have been reported to reduce the tubular secretion of methotrexate and thereby may enhance its toxicity. Concomitant use of NSAIDs and salicylates has been associated with fatal methotrexate toxicity.
However, patients using constant dosage regimens of NSAIDs have received concurrent doses of methotrexate without problems observed.
Treatment with more than one DMARD in various regimens is being tried but there is little evidence available to assess benefit. A meta-analysis of 5 different combinations of DMARDs demonstrated that although efficacy might be greater than single DMARDs, toxicity was also increased.
Renal tubular transport is also diminished by probenecid and penicillins; use of these with methotrexate should be carefully monitored.
A potential interaction may exist between methotrexate and proton-pump inhibitors (e.g. omeprazole, pantoprazole). Omeprazole may inhibit methotrexate clearance resulting in potentially toxic methotrexate levels.
Severe bone marrow depression has been reported following the concurrent use of methotrexate and co-trimoxazole or trimethoprim. Concurrent use should probably be avoided.
The use of nitrous oxide anaesthesia potentiates the effect of methotrexate on folate metabolism, yielding increased toxicity such as severe unpredictable myelosuppression, stomatitis and neurotoxicity. Severe neurotoxicity has particularly been reported with intrathecal administration of methotrexate following nitrous oxide anaesthesia.
An increased risk of hepatitis has been reported following the use of methotrexate and the acitretin metabolite, etretinate. Consequently, the concomitant use of methotrexate and acitretin should be avoided.
Methotrexate may increase the bioavailability of mercaptopurine by interference with first-pass metabolism.
Concomitant application of methotrexate and theophylline can reduce theophylline clearance.
4.6 Pregnancy and lactation
Abortion, foetal death, and/or congenital anomalies have occurred in pregnant women receiving methotrexate, especially during the first trimester of pregnancy. Methotrexate is contraindicated in the management of psoriasis or rheumatoid arthritis in pregnant women. Women of childbearing potential should not receive methotrexate until pregnancy is excluded. For the management of psoriasis or rheumatoid arthritis, methotrexate therapy in women should be started immediately following a menstrual period and appropriate measures should be taken in men or women to avoid conception during and for at least 6 months following cessation of methotrexate therapy.
Both men and women receiving methotrexate should be informed of the potential risk of adverse effects on reproduction. Women of childbearing potential should be fully informed of the potential hazard to the foetus should they become pregnant during methotrexate therapy. In cancer chemotherapy, methotrexate should not be used in pregnant women or women of childbearing potential who might become pregnant unless the potential benefits to the mother outweigh the possible risks to the foetus.
Defective oogenesis or spermatogenesis, transient oligospermia, menstrual dysfunction, and infertility have been reported in patients receiving methotrexate.
Methotrexate is distributed into breast milk. Because of the potential for serious adverse reactions to methotrexate in nursing infants, a decision should be made whether to discontinue nursing or the drug, taking into account the importance of the drug to the woman.
4.7 Effects on ability to drive and use machines
Not applicable
4.8 Undesirable Effects
The most common adverse reactions include ulcerative stomatitis, leukopenia, nausea and abdominal distress. Although very rare, anaphylactic reactions to methotrexate have occurred. Others reported are malaise, undue fatigue, chills and fever, dizziness and decreased resistance to infection. In general, the incidence and severity of side effects are considered to be dose-related. Adverse reactions as reported for the various systems are as follows:
Skin: Severe, occasionally fatal, dermatologic reactions including erythema multiforme, Stevens-Johnson syndrome, skin necrosis, exfoliative dermatitis, epidermal necrolysis. Erythematous rashes, pruritus, urticaria, dermatitis, photosensitivity, pigmentary changes, alopecia, ecchymosis, telangiectasia, acne, furunculosis. Lesions of psoriasis may be aggravated by concomitant exposure to ultraviolet radiation. Skin ulceration in psoriatic patients and rarely painful erosion of psoriatic plaques have been reported. The recall phenomenon has been reported in both radiation and solar damaged skin.
Blood: Bone marrow depression, leukopenia, thrombocytopenia, anaemia hypogammaglobulinaemia, haemorrhage from various sites, septicaemia.
Alimentary System: Gingivitis, pharyngitis, stomatitis, mucostitis, anorexia, vomiting, diarrhoea, haematemesis, melaena, gastrointestinal ulceration and bleeding, pancreatitis, enteritis, hepatic toxicity resulting in active liver atrophy, necrosis, fatty metamorphosis, periportal fibrosis, or hepatic cirrhosis. In rare cases the effect of methotrexate on the intestinal mucosa has led to malabsorption or toxic megacolon.
Hepatic: Hepatic toxicity resulting in significant elevations of liver enzymes, acute liver atrophy, necrosis, fatty metamorphosis, hepatitis, periportal fibrosis, or cirrhosis or death may occur, usually following chronic administration.
Urogenital System: Renal failure, azotaemia, cystitis, haematuria, defective oogenesis or spermatogenesis, transient oligospermia, menstrual dysfunction, infertility, abortion, foetal defects, severe nephropathy. Vaginitis, vaginal ulcers, cystitis, haematuria and nephropathy have also been reported.
Pulmonary System: Acute or chronic interstitial pneumonitis, often associated with blood eosinophilia, may occur and deaths have been reported (see Section 4.4 Special warnings and special precautions for use). Acute pulmonary oedema has also been reported after oral and intrathecal use. Pulmonary fibrosis is rare. A syndrome consisting of pleuritic pain and pleural thickening has been reported following high doses.
Central Nervous System: Headaches, drowsiness, blurred vision, aphasia, cognitive disorder, hemiparesis and convulsions have occurred possibly related to haemorrhage or to complications from intraarterial catheterization. Convulsion, paresis, Guillain-Barre syndrome and increased cerebrospinal fluid pressure have followed intrathecal administration.
Other reactions related to, or attributed to the use of methotrexate such as pneumonitis, metabolic changes, precipitation of diabetes, osteoporotic effects, abnormal changes in tissue cells and even sudden death have been reported.
There have been reports of leukoencephalopathy following intravenous methotrexate in high doses, or low doses following cranial-spinal radiation.
Cardiac disorders: Pericarditis, pericardial effusion
Ear disorders: Tinnitus
Eye disorders: Conjunctivitis
Infections and infestations: Opportunistic infections (sometimes fatal e.g. fatal sepsis) have also been reported in patients receiving methotrexate therapy for neoplastic and non-neoplastic diseases, Pneumocystis carinii pneumonia being the most common. Other reported infections include, pneumonia, nocardiosis, histoplasmosis, cryptococcosis, Herpes Zoster, Herpes Simplex, hepatitis and cytomegalovirus infection, including cytomegaloviral pneumonia.
Musculoskeletal and connective tissue disorders: Arthralgia/myalgia
Psychiatric disorders: Mood altered
Vascular disorder: Vasculitis, hypotension, thromboembolic events (e.g. thrombophlebitis, pulmonary embolism, arterial, cerebral, deep vein or retinal vein thrombosis).
Adverse reactions following intrathecal methotrexate are generally classified into three groups, acute, subacute, and chronic. The acute form is a chemical arachnoiditis manifested by headache, back or shoulder pain, nuchal rigidity, and fever. The subacute form may include paresis, usually transient, paraplegia, nerve palsies, and cerebellar dysfunction. The chronic form is a leukoencephalopathy manifested by irritability, confusion, ataxia, spasticity, occasionally convulsions, dementia, somnolence, coma, and rarely, death. There is evidence that the combined use of cranial radiation and intrathecal methotrexate increases the incidence of leukoencephalopathy.
Additional reactions related to or attributed to the use of methotrexate such as osteoporosis, abnormal (usually ‘megaloblastic’) red cell morphology, precipitation of diabetes, other metabolic changes, and sudden death have been reported.
4.9 Overdose
Calcium folinate (calcium leucovorin) is a potent agent for neutralizing the immediate toxic effects of methotrexate on the haematopoietic system. Where large doses or overdoses are given, calcium folinate may be administered by intravenous infusion in doses up to 75 mg within 12 hours, followed by 12 mg intramuscularly every 6 hours for 4 doses. Where average doses of methotrexate appear to have an adverse effect 6-12 mg of calcium folinate may be given intramuscularly every 6 hours for 4 doses. In general, where overdosage is suspected, the dose of calcium folinate should be equal to or higher than, the offending dose of methotrexate and should be administered as soon as possible; preferably within the first hour and certainly within 4 hours after which it may not be effective.
Other supporting therapy such as blood transfusion and renal dialysis may be required. Effective clearance of methotrexate has been reported with acute, intermittent haemodialysis using a high flux dialyser.
- PHARMACOLOGICAL PROPERTIES
5.1 Pharmacodynamic properties
Methotrexate is an antimetabolite which acts principally by competitively inhibiting the enzyme, dihydrofolate reductase. In the process of DNA synthesis and cellular replication, folic acid must be reduced to tetrahydrofolic acid by this enzyme, and inhibition by methotrexate interferes with tissue cell reproduction. Actively proliferating tissues such as malignant cells are generally more sensitive to this effect of methotrexate. It also inhibits antibody synthesis.
Methotrexate also has immunosuppressive activity, in part possibly as a result of inhibition of lymphocyte multiplication. The mechanism(s) of action in the management of rheumatoid arthritis of the drug is not known, although suggested mechanisms have included immunosuppressive and/or anti-inflammatory effect.
5.2 Pharmacokinetic properties
In doses of 0.1 mg (of methotrexate) per kg, methotrexate is completely absorbed from the gastrointestinal tract; larger oral doses may be incompletely absorbed. Peak serum concentrations are achieved within 0.5 – 2 hours following intravenous, intramuscular or intraarterial administration. Serum concentrations following oral administration of methotrexate may be slightly lower than those following intravenous injection.
Methotrexate is actively transported across cell membranes. The drug is widely distributed into body tissues with highest concentrations in the kidneys, gall bladder, spleen, liver and skin. Methotrexate is retained for several weeks in the kidneys and for months in the liver. Sustained serum concentrations and tissue accumulation may result from repeated daily doses. Methotrexate crosses the placental barrier and is distributed into breast milk. Approximately 50% of the drug in the blood is bound to serum proteins.
In one study, methotrexate had a serum half-life of 2-4 hours following intramuscular administration. Following oral doses of 0.06 mg/kg or more, the drug had a serum half-life of 2-4 hours, but the serum half-life was reported to be increased to 8-10 hours when oral doses of 0.037 mg/kg were given.
Methotrexate does not appear to be appreciably metabolised. The drug is excreted primarily by the kidneys via glomerular filtration and active transport. Small amounts are excreted in the faeces, probably via the bile. Methotrexate has a biphasic excretion pattern. If methotrexate excretion is impaired accumulation will occur more rapidly in patients with impaired renal function. In addition, simultaneous administration of other weak organic acids such as salicylates may suppress methotrexate clearance.
5.3 Preclinical safety data
Not applicable.
- PHARMACEUTICAL PARTICULARS
6.1 List of excipients
Sodium chloride, sodium hydroxide and Water for Injections
6.2 Incompatibilities
Immediate precipitation or turbidity results when combined with certain concentrations of droperidol, heparin sodium, metoclopramide hydrochloride, ranitidine hydrochloride in syringe.
6.3 Shelf life
As packaged for sale – 2 years
After dilution – Chemical and physical in-use stability has been demonstrated in dextrose 5% and sodium chloride 0.9% infusion solutions for 30 days at 4°C in PVC containers when protected from light.
From a microbiological point of view the product should be used immediately. If not used immediately, in-use storage times and conditions prior to use are the responsibility of the user and would normally not be longer than 24 hours at 2-8°C, unless dilution has taken place in controlled and validated aseptic conditions.
6.4 Special precautions for storage
As packaged for sale –
For the 50 mg/2 ml, 250 mg/10 ml and 500 mg/20 ml presentations: Do not store above 25°C. Do not freeze. Keep container in the outer carton.
For the 1 g/40 ml presentation : Store at 2°C – 8°C. Keep container in the outer carton.
After dilution – see 6.3.
6.5 Nature and contents of container
50 mg/2 ml – Conventional or Onco-Tain Type I glass vial with rubber stopper, aluminium seal and plastic ‘flip-off’ top. Packs containing 5 vials.
6.6 Special precautions for disposal and other handling
Single use only. Discard any unused contents.
Onco-Vials should be used with an appropriate Faulding administration device
7)Manufactured in India By:
TAJ PHARMACEUTICALS LIMITED
at SURVEY NO.188/1 TO 189/1,190/1 TO 4,
ATHIYAWAD, DABHEL, DAMAN- 396210 (INDIA)
Methotrexate 50mg/ 2ml Injection Taj Pharma
Methotrexate 250mg/ 10ml Injection Taj Pharma
Methotrexate 1000mg/ 10ml Injection Taj Pharma
Package leaflet:
Information for the patient
Methotrexate 250mg/10ml Injection
Read all of this leaflet carefully before you start taking this medicine because it contains important information for you.
– Keep this leaflet. You may need to read it again.
– If you have any further questions, ask your doctor or pharmacist.
– This medicine has been prescribed for you only. Do not pass it on to others. It may harm them, even if their signs of illness are the same as yours.
– If you get any side effects, talk to your doctor or pharmacist. This includes any possible side effects not listed in this leaflet (see section 4).
What is in this leaflet
1. What Methotrexate Injection is and what it is used for
2. What you need to know before you take Methotrexate Injection
3. How to take Methotrexate Injection
4. Possible side effects
5. How to store Methotrexate Injection
6. Further Information
1.WHAT METHOTREXATE INJECTION IS AND WHAT IT IS USED FOR
Methotrexate Injection is an anti-metabolite medicine (medicine which affects how the body’s cells grow) and immunosuppressant (medicine which reduces the activity of the immune system).
Methotrexate is used in large doses (on its own or in combination with other medicines) to treat certain types of cancer such as breast cancer. In smaller doses it can be used to treat severe psoriasis (a skin disease with thickened patches of inflamed red skin, often covered by silvery scales), when it has not responded to other treatments.
- WHAT YOU NEED TO KNOW BEFORE YOU TAKE METHOTREXATE INJECTION
You will not be given Methotrexate Injection if
· you are allergic (hypersensitive) to Methotrexate or any of the other ingredients of Methotrexate Injection
· have significant kidney or liver problems
- have been told you have (or think you have) a blood disorder such as low levels of white blood cells, red blood cells (anaemia) or platelets
· have any infection
· your immune system is not working as well as it should
Tell your doctor if any of the above applies to you before this medicine is used.
Take special care with Methotrexate Injection if you
· have a stomach ulcer or ulcerative colitis (inflammation and ulceration of the gut)
· have an infection
· have mild kidney problems
· have a medical condition which causes a build up of fluid in the lining of your lungs or in your abdomen (the fluid will need to be drained before methotrexate treatment is started)
· are to have radiotherapy (risk of tissue and bone damage may be increased)
·are to have any vaccinations
Tell your doctor if any of the above applies to you before this medicine is used.
Special care will also be taken in children, the elderly and in those who are in poor physical condition.
Taking/using other medicines
Special care is needed if you are taking/using other medicines as some could interact with methotrexate, for example:
· non-steroidal anti-inflammatory medicines e.g. ibuprofen (medicines taken for pain relief)
· aspirin or similar medicines (known as salicylates)
· omeprazole, esomeprazole and pantoprazole (medicines used to reduce the production of stomach acid)
· diuretics (water tablets)
· medicines taken for diabetes (including insulin and tablets)
· antibiotics such as penicillins, sulphonamides, co-trimoxazole, trimethoprim, tetracycline, chloramphenicol and para-aminobenzoic acid
· phenytoin (medicine often used to treat epilepsy)
· vitamin supplements containing folic acid
· probenecid (medicine used to treat gout)
· nitrous oxide (used for general anaesthesia and pain relief). Nitrous oxide increases the effect of Methotrexate and can lead to an increase in some side effects (such as reduced number of blood cells and platelets and inflammation of mouth). Following injection into the spine it can have an effect on your nervous system
· retinoids, such as acitretin (a medicine used to treat psoriasis) or isotretinoin (used to treat severe acne)
· other drugs that may cause damage to your kidneys
· other drugs that may case damage to your liver
· live virus vaccines
· mercaptopurine (medicine used in the treatment of blood cell cancer)
· theophylline (medicine used in the treatment of asthma)
Please tell your doctor if you are taking or have recently taken any other medicines, including medicines obtained without a prescription.
Using Methotrexate Injection and drinking alcohol
Do not drink alcohol whilst being treated with Methotrexate as alcohol increases the risk of liver damage.
Pregnancy and breast-feeding
Tell your doctor if you are pregnant, trying to become pregnant or breast-feeding before this medicine is used.
This medicine must not be used during pregnancy.
Mothers should not breast-feed whilst treatment with methotrexate in ongoing.
Due to the risk of birth defects, conception should be avoided during methotrexate treatment and for at least 6 months after treatment is stopped.
Ask your doctor or pharmacist for advice before taking any medicine.
Driving and using machines
Do not drive or use machines if you experience any side effect (e.g. dizziness, drowsiness or blurred vision) which may lessen your ability to do so.
Important information about one of the ingredients of Methotrexate Injection
This medicinal product contains 0.2 mmol (4.5 mg) sodium per millilitre (ml) of solution. To be taken into consideration by patients on a low sodium diet.
- HOW TO TAKE METHOTREXATE INJECTION
This medicine may be given by injection into a vein (intravenous injection), into muscle (intramuscular injection), into an artery (intraarterial injection) or into the spine (intrathecal injection)*. It may also be given by infusion (drip) into a vein. It may be diluted before it is given.
* Of the presentations available (see section 6) only the 50 mg/2 ml is suitable for intrathecal injection.
Dose
Your doctor will work out the correct dose of Methotrexate Injection for you and how often it must be given.
The dose of medicine given to you will depend on the disease being treated, your medical condition, your age, your size and how well your kidneys are working.
Before treatment is started your doctor may carry out blood tests to check the levels of cells in your blood, and also to check how well your kidneys and liver are working. You may also have a chest X-ray. Further tests may also be done during and after treatment.
If you are given too much or too little Methotrexate Injection
This medicine will be given to you in a hospital, under the supervision of a doctor. It is unlikely that you will be given too much or too little, however, tell your doctor or nurse if you have any concerns.
4.POSSIBLE SIDE EFFECTS
Methotrexate is a very toxic medicine and patients have died, or become very ill, whilst being treated with it. During treatment you should watch for any side effects and report them to the doctor.
If any of the following happen, tell your doctor immediately:
· severe allergic reaction – you may experience a sudden itchy rash (hives), swelling of the hands, feet, ankles, face, lips, mouth or throat (which may cause difficulty in swallowing or breathing), and you may feel you are going to faint
· inflammation of the lung with breathlessness – you may develop a persistent cough, experience pain or difficulty breathing, or become breathless. This may be associated with changes in a particular type of white cell in your blood.
· symptoms of an infection e.g. fever, chills, achiness, sore throat
· unexpected bleeding e.g. bleeding gums, blood in the urine or in vomit, or the appearance of unexpected bruises or broken blood vessels (broken veins)
· black tarry stools
· a sore mouth, particularly if you have a number of ulcers or blisters inside of the mouth or on the tongue
· skin rashes or blistering to the surfaces of the eyes, nose, vagina or anus (back passage)
· diarrhea
· stroke/ weakness on one side of the body
· weakness in the legs that spreads to the upper limbs and the face, which may result· in paralysis
· abdominal pain, fatty stools, vomiting
· chest pain (which may be due to heart or lung problems)
These are serious side effects. You may need urgent medical attention.
If any of the following happen, tell your doctor as soon as possible:
· low blood pressure (you may feel faint)
· fits
· blurred vision
· dizziness
· difficulty/inability to talk
· muscle weakness
· you may feel the need to drink more than usual (diabetes)
· abnormally easily broken bones (osteoporosis)
· pain or redness of the blood vessels (vasculitis)
· itching or the appearance of lightened patches on the skin, bruises, boils
· increased sensitivity to sunlight
· acne
· yellowing of the skin and whites of the eyes (jaundice)
· pain in the stomach, loins or abdomen
· you may need to pass urine more often than normal, which may be painful (cystitis)
· headaches
· drowsiness
· generally feeling tired or unwell
· reduced appetite, feeling or being sick
· irregular periods in women (periods may stop completely)
· hair loss
· effects on learning and memory
· ringing in the ears
· joint and muscle pain
· blood clot which causes pain, swelling or redness (cerebral, deep vein, retinal
· vein or arterial vein) mood alterations
· inflammation of the lungs, which causes breathlessness, cough and raised temperature, pneumonia
· shingles (Herpes Zoster)
Some different side effects may occur following injection into the spine. These are
· headache
· back or shoulder pain
· difficulty with bending your head down
· fever
· temporary paralysis or weakness
· problems with a particular part of your brain, leading to shaking, abnormal balance or staggering.
· Irritability and confusion
· Stiffness
· Fits
· Confusion and loss of memory
· Sleepiness
· Coma
· Death
Methotrexate may lead to problems with your blood, liver and kidneys. Your doctor will take blood samples to check for these problems and may ask you to have an operation to have a small sample of you liver removed.
If any of the side effects gets serious, or if you notice any side effects not listed in this leaflet, please tell your doctor.
Effects on fertility
Treatment with methotrexate may reduce fertility in men and women. Fertility is thought to go back to normal after methotrexate treatment is stopped. Tell your doctor if you have concerns.
5.HOW TO STORE METHOTREXATE INJECTION
Keep out of the reach and sight of children
Expiry
This medicine must not be used after the expiry date which is stated on the vial label and carton after ‘EXP’. Where only a month and year is stated, the expiry date refers to the last day of that month.
Storage
The vials should be kept in the outer carton, in order to protect from light, and stored at, or below, 25°C. The vials should not be frozen. Unused portions of opened vials must not be stored for later use. Prepared infusions should be used immediately, however, if this is not possible they can, in certain circumstances, be stored for up to 30 days in a refrigerator provided they have been prepared in a way to exclude microbial contamination.
- FURTHER INFORMATION
What Methotrexate Injection contain
The active substance is methotrexate. Each millilitre (ml) of solution contains 25 milligrams (mg) of methotrexate.
The other ingredients are sodium chloride, sodium hydroxide and Water for Injections.
What Methotrexate Injection look like and contents of the pack
Methotrexate Injection is a clear, yellow solution for injection which comes in glass containers called vials.
It may be supplied in packs containing:
· 5 x 50 mg/2 ml vials
· 1 x 500 mg/20 ml vial
Not all packs may be marketed
7)Manufactured in India By:
TAJ PHARMACEUTICALS LIMITED
at SURVEY NO.188/1 TO 189/1,190/1 TO 4,
ATHIYAWAD, DABHEL, DAMAN- 396210 (INDIA)
