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azathioprine, tamoxifen) • All analgesics can be given before surgery - EXCEPT NSAID’S (see below) OMIT • ACE inhibitors (ramipril, enalapril, perindopril, captopril) • Angiotensin 2 antagonists (candesartan, losartan) o Both these drugs may drop the blood pressure during an anaesthetic. There has been a report of a patient who ingested a single overdose of 7.5 g of azathioprine. Genotypic testing of NUDT15 variants may be considered before initiating azathioprine therapy. In many instances the symptom resolved spontaneously despite continuing therapy.Reporting suspected adverse reactions after authorisation of the medicinal product is important. Each child was on maintenance treatment of 6-mercaptopurine and the dosage was calculated based on their body surface area. If no improvement occurs in the patient's condition within three months, consideration should be given to withdrawing azathioprine. By continuing to browse the site you are agreeing to our policy on the use of cookies. Serious side effects. Some patients experience nausea when first given azathioprine.
When suggestions are available use up and down arrows to review and ENTER to select. It is recommended that complete blood counts be repeated monthly or at least at intervals of no longer than 3 months.Liver function should be controlled regularly, especially in patients with hepatic dysfunction.Close monitoring of blood counts is required if azathioprine is given together with:About 10% of patients have thiopurine methyltransferase (TPMT) deficiency due to genetic polymorphism. x��Z�o�F� �?����(��nݦh{}(pi? They generally require dose reduction, particularly those being NUDT15 variant homozygotes (see section 4.2). If the film-coated tablet has to be halved, contact of the skin with tablet dust or the broken area must be avoided (see section 4.2 and 6.6).Allopurinol, oxipurinol and thiopurinol have an inhibitory effect on the metabolism of azathioprine by blocking the enzyme xanthinoxidase. The frequency of NUDT15 c.415C>T has an ethnic variability of approximately 10% in East Asians, 4% in Hispanics, 0.2% in Europeans and 0% in Africans. There are conflicting clinical reports of interactions, resulting in serious haematological abnormalities, between azathioprine and co-trimoxazole.There have been case reports suggesting that haematological abnormalities may develop due to the concomitant administration of azathioprine and ACE Inhibitors.It has been suggested that cimetidine and indomethacin may have myelosuppressive effects which may be enhanced by concomitant administration of azathioprine.Xanthine oxidase activity is inhibited by allopurinol, oxipurinol and thiopurinol which results in reduced conversion of biologically active 6-thioinosinic acid to biologically inactive 6-thiouric acid.
It is rapidly broken down in vivo into 6-MP and a methylnitroimidazole moiety. 4.5 Interaction with other medicinal products and other forms of interaction6.6 Special precautions for disposal and other handling9. Other information If your treatment ends and you have some tablets left over, return them to your pharmacist.
Special care should therefore be taken during co-administration of aminosalicylate derivatives, including sulphasalazine, which are inhibitors of the TPMT enzyme. Approximately 0.3% (1:300) of patients have two non-functional alleles (homozygous-deficient) of the TPMT gene and have little or no detectable enzyme activity. Active measures (such as the use of activated charcoal) may not be effective in the event of azathioprine overdose unless the procedure can be undertaken within 60 minutes of ingestion.Further management should be as clinically indicated or as recommended by the national poisons centre, where available.The value of dialysis in patients who have taken an overdose of azathioprine is not known, though azathioprine is partially dialysable.Pharmacotherapeutic group: Antineoplastic and Immunomodulating agents Azathioprine is an imidazole derivative of 6-mercaptopurine (6-MP). Serologic testing may be useful in determining previous exposure. It can take weeks or months before therapeutic effect is seen.The medicinal product may be given over the long term unless the patient cannot tolerate the preparation.In cases, such as rheumatoid arthritis and certain haematological conditions, the treatment can be stopped after a certain period without problems.Withdrawal of azathioprine should always be a gradual process performed under close monitoring.Halving of the film-coated tablet should be avoided unless needed for gradual withdrawal (see sections 4.4 and 6.6). This is usually checked in everyone before starting azathioprine. Airtight container However, the aetiology is not clearly established and high-dose corticosteroids may be implicated. • Pregnancy unless the benefits outweigh the risks (see section 4.6)There are potential dangers in the use of azathioprine film-coated tablets; they should therefore not be prescribed unless the patient can be adequately monitored for toxic effects throughout the duration of therapy.During the first eight weeks of treatment, a complete blood count, including platelet count must be performed at least once weekly. This problem could be exacerbated by co-administration with medicinal products that inhibit TPMT, such as olsalazine, mesalazine or sulfasalazine. These patients generally require dose reduction; particularly those being NUDT15 variant homozygotes (see section 4.4). With oral administration, nausea appears to be relieved by administering the tablets after meals.
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