Immunosuppressants Flashcards
What are immunosuppressants?
Suppresses or prevents the immune response
What are immunosuppressants used for?
Transplant rejection
Inflammatory disease
What are the antiproloferative immunosuppressants?
Azathioprine
Mercaptopurine
Mycophenolate mofetil
What are the other immunosuppressants?
Ciclosporin
Tacrolimus
Corticosteroids
Can you have vaccines when on immunosuppressants?
Yes, but not live vaccines
What is the mechanism of action of azathioprine and mercaptopurine?
Mercaptopurine inhibits purine metabolism therefore DNA, RNA and protein synthesis
Azathioprine is metabolised to mercaptopurine
What are the side effects of azathioprine and mercaptopurine?
Hypersensitivity reactions - stop immediately
Bone marrow suppression - pre treatment screening for thiopurine methyl transferase
What are the interactions for azathioprine/mercaptopurine?
Allopurinol - toxicity, inhibits metabolism of purines
What is the mechanism of action of mycophenolate mofetil?
Metabolised to mycophenolic acid
What are the side effects of mycophenolate mofetil?
Hypogammaglobinaemia - recurrent infections
Bronchiectasis - respiratory symptoms
Bone marrow suppression
Can mycophenolate mofetil be used in pregnancy?
NO - genotoxic and teratogenic
Women - 2 methods of effective contraception until 6 weeks after discontinuing
Men - use condoms until 90 days after discontinuing
What is the mechanism of action of tacrolimus?
Calcineurin inhibitor
What are the side effects of tacrolimus?
Heart - cardiomyopathy Kidney - nephropathy Liver - hepatotoxicity Bone marrow - blood dyscrasias Blood - hypertension, hyperglycaemia, hyperkalaemia, hyperuricaemia Neurotoxicity - headaches and tremors Eye disorders - blurred vision, photophobia Skin - rashes
What are the counselling points for tacrolimus?
Avoid sunlight
Avoid high potassium and grapefruit juice
Driving may be affected
What is the MHRA warning for tacrolimus?
Maintain on same brand of oral tacrolimus