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Why have I been started on this medicine? Azathioprine (AZAT) and mercaptopurine (MP) are two related medications used to control the immune defence system. Many inflammatory bowel disease (IBD) patients have been safely using them since the 1970s. Elion and Hitchings developed AZAT and MP in 1950s, going on to share the 1988 Nobel prize in Medicine. In Crohn’s and ulcerative colitis, the gastrointestinal immune system is often overactive. Decreasing this overactivity can help to prevent  intestinal bleeding, loose motions, pain and other complications.

How long will I need to take it to feel better? These drugs usually work slowly. Results (ie. decreasing or getting off prednisone, good pain-relief or healing the bowel, fistula or abscess) happen usually by 2-6 months, so make sure to take your pills every day as directed and don’t give up too early. Some get better faster (20% at 2 weeks) and others take longer (6 -12 months). AZAT/MP is usually given for up to 5 years and beyond if it is working. In one study 95%, 69% and 55% stayed better after 1, 3 and 5 years respectively. There is a common temptation to stop AZAT/MP if you feel well. However, if you do, you are likely to flare within 1-5 years after stopping and you may need surgery. Talk with your doctor first.

What dose will I take? Your doctor will tell you your target dose. It depends on your weight (AZAT: 2.5mg per kg & MP: 1.5mg per kg). Usually 25-50mg daily is started for two weeks. If you feel well and 2 sets of blood tests are good, you jump to the target dose (eg. if you are 70kg: MP 25mg for 2 weeks then 75mg daily; or AZAT 50mg for 2 weeks then 150mg daily). It is taken either once or twice a day, with or after food. Smaller doses are rarely worth taking.

What options do I have if it doesn’t work? AZAT/MP can only work if you take them. Sticking with the regimen as prescribed, especially if you feel well, is called “compliance” or “adherence.”  It can be one of the hardest parts of living with a chronic illness but it is one of the most critical factors to staying well with Crohn’s and colitis. One study had 70% get better and stay better if they took AZAT/MP as prescribed. On the other hand, your chance of benefiting from AZAT/MP may be only 1 in 2 or 1 in 3 (50% got better taking only sugar pills), so if you have taken the tablets as prescribed for a good 6 months and they are not working for you or serious side effects are a problem, talk to your doctor about another treatment  such as  methotrexate, a biological, a new research drug or surgery.

What are the possible side effects? Like with all drugs including placebos, a few (about 5%) get unwanted side effects, which usually improve as your body adjusts to the new medicine. Very rare potentially life-threatening reactions can occur. These effects usually go away on stopping the drug or lowering the dose. Allergy effects 2-4% in the first few weeks include fever, rash, sore joints; 3% may get abdominal pain from pancreatitis. Loss of appetite, nausea, vomiting, diarrhoea, headache, fatigue, infections, liver 0.3% or bone marrow 4% effects may occur. Severe infections (1.8%) are uncommon including chickenpox, shingles, measles and pneumonia; short viral infections are not uncommon.

How will I be monitored for the side effects?  Problems usually occur in the few weeks but can occur later. Blood tests (to check the bone marrow and liver) will be carried out regularly until a stable dose has been reached (usually weekly for 4 weeks, then monthly for 3 months and then once every three months). Learn to follow these results yourself and you can usually be sent the blood results.

Will I need to take any special precautions while on azathioprine or 6-MP? Provided you don’t smoke, there is no strong evidence of increase cancer risk. Some cancers may be prevented. Taking AZAT or MP for years may increase your sun sensitivity. So, be careful in the sun, use sunscreen and get annual skin checks to help prevent skin cancer. Make sure to keep up to date with pap smears. A rare blood cancer (lymphoma) may be slightly increased (2-5x increase from general very low risk of 1-1/2000 per year). Be careful with certain vaccinations. You must never be given “live vaccines” such as rubella (German measles), VZV, yellow fever and BCG while on AZAT/MP. Talk with your doctor about getting these “live vaccines” before you start AZAT/MP and check your immunity to VZV and HBV. Flu vaccines and pneumovax are safe and recommended.

What if I get a sick on AZAT/MP? Close monitoring with your doctor helps pick up early problems. If fever, rash, sore joints or throat, bruising occurs, stop AZAT/MP until a blood test (FBC) or doctors review. Stop the drug also if blood tests are very abnormal (WBC < 3, Neutrophils < 1.5, Platelets < 150, ALT >90) and seek an urgent doctor review. See below chart. Report immediately any infections. If you have not had chicken pox, and come into contact with it or shingles, you should see your doctor quickly (within 4 days), as you may need special treatment. Don’t panic if you are the 5% who get side effects. Often with some care, under close supervision, AZAT/MP can be continued. Here you might go into remission for years after a switch from MP to AZAT or from AZAT to MP or a “desensitisation” eg. 1/8th a tablet, increasing by ¼- 1/8th of a tablet every three days until the target dose. Other reactions may respond to combining a lower dose with allopurinol.

Does AZAT/MP affect fertility, pregnancy, breastfeeding? A baby has its best start if the mother is well. Growing numbers of women safely achieve normal pregnancies, births and healthy breastfed babies on AZAT/MP. If you plan a family, or become pregnant while taking AZAT/MP, you will have to discuss the risks and benefits with your doctor and make your own balanced decision. The risk of stopping AZAT/MP may be higher than staying on it. It may help to get your IBD under control for 3 months before trying to conceive. Ensure smoking cessation, adequate B6, zinc and folate. Your doctor may recommend higher folate supplementation. AZAT/MP has not been shown to affect fertility. On breastfeeding, ask your doctor about half breast/formula feeding as it requires special care with help from an interested paediatrician or lactation consultant.  In couples with miscarriage, men may consider switching to another medication, only if they have stable, inactive IBD.

Can I take other medicines at the same time? You should always tell any doctor or pharmacist treating you that you are on azathioprine/mercaptopurine. Some drugs don’t mix well. These include allopurinol (taken to prevent gout), warfarin (taken to stop the blood clotting), frusemide and ACE inhibitors. Be careful with over-the-counter drugs and some herbal remedies. However, most drugs can safely be taken with AZAT/MP. Ask your doctor about safe alcohol drinking.

Where can I find out more about azathioprine/mercaptopurine? If you want to know more about, or if you are worried about your treatment, you should speak to your doctor or pharmacist. This information sheet does not list all of the possible side effects. For more details, look at the drug information sheet which comes in the box insert. Be reassured that, while reading about rare side effects may increase anxiety, with a little care and low risk, these drugs have helped transform the lives of many people with Crohn’s and colitis.

When should I contact my doctor?  Contact your doctor or our IBD clinic in the following situations:

If you want to change your dose or stop the medicine.

If you have severe side effects.

If you are going to take any new medication or preparation.

If you are in contact with anyone who has chickenpox or shingles and you are not already immune.

If you develop any kind of infection, unusual bruising or bleeding.

If you want to start a family, become pregnant or if you want to breastfeed.

 

Monitoring guidelines for you and your doctor:

Bone marrow suppression (WC < 3.5 occurs up to 10%)

consider drugs interactions eg. 5-ASAs may increase neutropenia risk)

Mild (WCC 2.5-3.5): reduce AZAT/MP dose 25% and repeat FBC regularly to confirm improvement;

Moderate (WCC 1.5 – 2.5): stop AZAT/MP 1 week, & consider restarting at 50% dose with weekly FBC;

Severe (WCC < 1.5, lymphocytes <0.5 or neutrophils<1): withdraw treatment. If patient has fever admit for intravenous antibiotics and consider G-CSF.

Liver changes: consider other causes of increased ALT including drug interactions, viral illnesses, alcohol

ALT levels < 3x ULN (upper limit of normal) (ALT< 90 in 15% patients): observe as they usually resolve

ALT 3 – 10 x ULN: reduce dose by 50%, and repeat ALT in one month (if occurs at low dose specialist may consider checking metabolites eg. 6TG/6MMP, splitting dose or adding allopurinol 100mg)

ALT > 10 x greater than normal: stop drug until signs of ALT normal. Then attempt to slowly advance the dose of 6MP to the highest appropriate dose that does not cause ALT elevation.

Adult (>18yrs) Vaccine Recommendations for IBD Patients on Immunosuppression

Vaccines recommended per routine guidelines, regardless of immunosuppression
Influenza (trivalent inactivated vaccine) first 2 doses 0, 4 week then annual
Tetanus (as part of dT or dTpa) every 10 years
HPV (quadrivalent vaccine against types 6, 11, 16, and 18)

Vaccines recommended per routine guidelines, ideally before initiation of immunosuppression
Pneumococcus (PPSV23) every 5 years
Pertussis (as part of dTpa)
Contraindicated vaccines (within 1 month of steroids)
Live, attenuated influenza (intranasal vaccine)
Varicella zoster vaccine
Herpes zoster (live zoster vaccine)
Yellow fever vaccine
Measles-mumps-rubella vaccine
Typhoid live oral vaccine
Smallpox vaccine
Tuberculosis BCG vaccine
Polio live oral vaccine
Anthrax vaccineSpecial risk groups

Hepatitis A (single-antigen vaccine or hepatitis A and B combination vaccine “Twinrix”)

Hepatitis B vaccine (H-B-Vax II – 20ug dialysis formulation) standard or accelerated 0, 1, 2 months if 5-12 month titre <100IU/L give 4th dose)

Meningococcus (MCV4 or MPSV-4) authorised not recommended

DTap=combination vaccination against diphtheria, acellular pertussis and tetanus; HPV=human papillomavirus; MCV4=quadrivalent meningococcal vaccine; MPSV-4=quadrivalent meningococcal polysaccharide vaccine; PCV13=13-valent pneumococcal conjugate vaccine; PPSV23=23-valent pneumococcal polysaccharide vaccine

Click here for further Australian guidelines