Cyclosporine: what it treats, how to take it, side effects
Last updated September 3, 2026.
Cyclosporine (brand names Neoral, Sandimmune, Gengraf) is a powerful immunosuppressant that prevents organ transplant rejection and treats severe psoriasis and rheumatoid arthritis. It works, and it demands respect: blood tests, blood-pressure checks, and a long interaction list are part of the treatment.
What does it treat?
In transplant patients it prevents the immune system from attacking the new kidney, liver, or heart. In modified formulations it treats severe plaque psoriasis that has not responded to other therapy and severe active rheumatoid arthritis. It suppresses immunity; that is the mechanism and the risk in one sentence.
How do you take it?
Cyclosporine (modified, i.e., Neoral/Gengraf) is usually taken twice a day, at the same times daily, on a consistent schedule relative to meals. Consistency is not fussiness: absorption varies, and transplant doses are tuned to blood levels drawn just before the morning dose. Never switch between modified and non-modified brands without your prescriber, because they are not interchangeable milligram for milligram. Avoid grapefruit and grapefruit juice entirely, since they raise drug levels. Missed dose: take it when remembered unless the next dose is near; never double up. Expect regular monitoring of kidney function, blood pressure, potassium, and drug levels.
Side effects to know
- Common: tremor, headache, extra hair growth, gum overgrowth, nausea, diarrhea, high blood pressure, and raised potassium.
- Serious: kidney damage (dose- and duration-related, and the main reason for monitoring), serious infections, lymphoma and other cancers including skin cancer, severe high blood pressure, and seizures at high levels. Sun protection matters because of the skin-cancer risk.
Who should not take it?
For psoriasis and RA uses, it should be avoided with abnormal kidney function, uncontrolled high blood pressure, or cancer. Live vaccines are off the table while immunosuppressed. The interaction list is long: many antibiotics, antifungals, seizure drugs, statins, and St. John's wort change levels dangerously, so every new medicine, prescription or not, gets checked first. Pregnancy requires specialist weighing of real risks against real need.
When is it an emergency?
Call 911 for a seizure, sudden severe headache with vision change, fainting, or signs of severe infection like high fever with confusion. Facial swelling or trouble breathing after a dose also means 911. Pymander's escalation routing is built and tested specifically for this class of decision; see the safety architecture working paper.
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Common questions
Why so many blood tests?
Because the safe window is narrow and personal. Too little drug and the transplant rejects or the psoriasis returns; too much and kidneys, blood pressure, and nerves take damage. Trough levels before the morning dose, plus kidney function, potassium, and blood pressure, are how the dose stays in your window.
Why no grapefruit?
Grapefruit blocks the enzyme that breaks cyclosporine down, so levels climb unpredictably toward toxicity. This is not a small effect, and it lasts a day or more after the fruit or juice, so the advice is total avoidance for the whole course, not spacing.
Neoral vs Sandimmune: are they the same?
Same drug, different absorption. Neoral and Gengraf are "modified" formulations with more consistent bioavailability; Sandimmune is not modified. They are not interchangeable milligram for milligram, and switches between them require prescriber-managed dose and level checks. Always refill the exact product prescribed.
Does cyclosporine raise cancer risk?
It raises the risk of lymphoma and skin cancers, roughly in proportion to how much and how long immunity is suppressed. The practical responses are sun protection (sunscreen, clothing, skin checks) and reporting new lumps, changing moles, or persistent fevers rather than watching them.
What vaccines can I get on cyclosporine?
Inactivated vaccines, including flu and COVID shots, are fine and encouraged. Live vaccines (like MMR, varicella, and the nasal flu spray) are avoided because a suppressed immune system may not control the weakened virus. Sort vaccines before starting when possible.
Why does it cause hair growth and gum changes?
Nobody fully knows, but both are classic, harmless-in-themselves effects: increased hair growth on the face and body, and gum overgrowth that good brushing and dental cleanings keep in check. Both reverse after stopping. Gum swelling that bleeds or overgrows teeth gets a dental referral.