BNF - Chapter 8 - Immune system and malignant disease Flashcards
(256 cards)
Which immunosuppressant drugs have a role in the management of inflammatory bowel disease?
- Azathiopurine
- Ciclosporin
- Mercaptopurine
- Methotrexate
Other than chronic inflammatory diseases when else are immunosuppressants used?
They are used to suppress rejection in organ transplant recipients and to treat a variety of chronic inflammatory and autoimmune diseases.
What may modification of tissue reactions caused by corticosteroids and other immunosuppressants result in?
The rapid spread of infection
What do antiproliferative drugs do?
Antiproliferative agents, also known as antimetabolites, inhibit cell-cycle pathways to limit T- and B-cell proliferation and thereby reducing the cytotoxic response directed toward the cardiac allograft.
Give a list of some antiproliferative immunosuppressants?
- Azathioprine
-Mercaptopurine - ## Mycophenolate mofetil
What is azathioprine metabolised to?
Mercaptopurine
When azathioprine is given with allopurinol should the dose stay the same?
Doses should be reduced when allopurinol is given concurrently
Which has a more selective mode of action - mycophenolate or azathioprine?
Mycophenolate
Are the corticosteroids immunosuppressants?
Yes they are powerful immunosuppressants
They are used to prevent organ transplant rejection, and in high dose to treat rejection episodes
What inhibitor is ciclosporin?
Calcineurin inhibitor
Is ciclosporin an immunosuppressant?
Yes - it is a potent immunosuppressant which is virtually non-myelotoxic but markedly nephrotoxic
Name another calcineurin inhibitor?
Tacrolimus;
Although not chemically related to ciclosporin it has a similar mode of action and side effects
Is the incidence of neurotoxicity greater with ciclosporin or tacrolimus?
It is greater with tacrolimus than with ciclosporin
Name a non-calcineurin inhibiting immunosuppressant licensed for renal transplantation?
Sirolimus
What is myelosuppression?
Suppression of the immune system
Azathioprine is an immunosuppressant metabolised to?
Mercaptopurine
What are some hypersensitivity reactions of azathioprine?
- malaise
- dizziness
- Vomiting
- Diarrhoea
- Fever
- Myalgia
- rash
- hypotension
- renal dysfunction
What should patients do if they experience any of these hypersensitivity reactions?
Withdraw treatment immediately
What blood disorders can azathioprine cause?
Neutropenia and thrombocytopenia
Neutropenia is dose-dependent
What does the management of neutropenia and thrombocytopenia induced by azathioprine require?
Careful monitoring and dose adjustment
What symptom is common in the early stages of treatment with azathioprine?
- Nausea is common and usually resolves in a few weeks without changing the dose.
With azathioprine how can moderate nausea be managed?
By using divided daily doses, taking doses after food, prescribing antiemetics or temporarily reducing the dose
What pre-screening treatment is important with azathioprine?
The enzyme thiopurine methyltransferase (TPMT) which metabolises thiopurine drugs (azathioprine, mercaptopurine, etc.)
What risk is increased in patients with reduced activity of the enzyme TPMT?
Increases the risk of myelosuppression in patients with reduced activity of this enzyme (TPMT), thus TPMT activity should be measured before starting treatment