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Cyclosporine is for eczema or psoriasis that is out of control, when we need it calm in weeks, not months. Nothing else we prescribe works this fast.
It comes on a short leash — blood pressure and kidney tests before we start and all the way through, a year of continuous use as the outside limit, an exit planned before the first capsule. Bring every medicine, supplement and herbal product, because the interaction list is long, and grapefruit is on it.
— Dr. Schwarz, Board Certified Dermatologist
Key Facts
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| Also called | Neoral, Sandimmune, Gengraf, ciclosporin |
| Drug class | Calcineurin inhibitor, an oral immunosuppressant |
| Taken as | Capsule or oral liquid, usually twice a day |
| Typical course | Short. Often 8 to 16 weeks, with about one year as the outer limit of continuous use |
| Time to work | Itch often settles within 2 weeks, clear skin improvement by 4 to 6 weeks |
| Monitoring | Blood pressure and kidney blood tests before starting and throughout |
| Prescription only | Yes |
What It Is
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Cyclosporine is a pill that damps down part of the immune system. It came from a soil fungus, developed in the 1970s and 1980s to stop organ transplant rejection, still its largest use. In skin it is used for severe disease that creams and light treatment have not controlled: severe psoriasis, severe eczema, chronic hives that antihistamines do not touch, pyoderma gangrenosum, and some blistering diseases. It is licensed in the United States for severe psoriasis; eczema use is off-label there and licensed in many other countries. It is a rescue drug. It buys control quickly while a slower, safer long-term treatment gets going.
How It Works
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Cyclosporine blocks an enzyme called calcineurin inside T cells, the cells that drive psoriasis and eczema. Calcineurin is the switch that lets an activated T cell turn on its inflammatory genes, above all interleukin-2. Block the switch and the cell cannot call in reinforcements; the cascade stalls.
It acts early in the cascade and is not selective. Blocking one step near the top is why it works fast and across many diseases. It is also why infections are more likely, why skin cancer risk rises with long use, and why it is not left running for years.
Here is where Cyclosporine acts in the skin, and what the others do instead.
About Cyclosporine
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Skin basics
Cyclosporine works on the immune signal throughout the body, not just where the rash is. That is what makes it powerful in widespread disease, and why it needs monitoring. Switches T cells off broadly and works within weeks, which is why it is used to break a severe flare. Blood pressure and kidneys limit how long anyone stays on it.
Cyclosporine arrives from the inside, carried to the skin by the blood, rather than crossing the barrier from outside. That is why it works everywhere at once, and why it needs monitoring.
In a plaque, skin cells travel from the bottom of the epidermis to the surface in four to six days instead of a month, and pile up as scale. This slows them back down, so the plaque thins.
The outer film of dead cells and oil. It holds water in and keeps irritants out, and it is thinner than a sheet of paper. Almost every dry, itchy, stinging skin problem starts here.
The outer layer, and the only one anything in a jar reaches. It renews itself constantly: a cell made at the bottom takes about a month to reach the surface and flake off. Most of what a skincare product does, it does here.
The living layer underneath, holding the blood vessels, the nerves and the collagen. It is where lasting change happens and it is hard to reach: most of what is sold for the skin never gets this far.
What It Treats
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Not the Best For
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Forms
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Cyclosporine comes as capsules and an oral liquid, and one distinction matters more than the brand name.
Modified cyclosporine (Neoral, Gengraf) is an emulsion the gut absorbs far more reliably. Non-modified cyclosporine (Sandimmune) is the original formula and absorbed less predictably. They are not interchangeable milligram for milligram, and dermatology dosing is written around the modified form. If the pharmacy hands you a different-looking box, check the type has not changed.
The liquid is for people who cannot swallow capsules or need smaller dose steps.
Strengths
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The daily dose comes from body weight, built from a few fixed capsule sizes, so most people take more than one at a time.
Dose
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The dose is set by body weight, then adjusted by blood pressure and kidney tests, not by how the skin looks.
How to Take It
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When to take it: Twice a day, about 12 hours apart, at the same times daily. Be consistent about food: always with meals or always without, because switching changes absorption. Swallow capsules whole and leave them in the foil until you take them. On the liquid, mix it with orange or apple juice in a glass cup, stir and drink it straight away, then rinse the cup with more juice and drink that too. Never use grapefruit juice.
If you miss a dose: Take it when you remember unless the next dose is close, then skip it. Never take two at once. Tell the prescriber if you miss more than a dose or two, or vomit soon after taking it, because the dose is built around your blood level.
What to Expect
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Side Effects
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It works faster than almost anything else, and the trade-off is blood pressure, kidneys and infection risk. That is why courses are kept short and the blood tests are not optional.
Common — expected, and they settle
- Higher blood pressure Common enough to check at every visit.
- Tingling in the hands and feet Often early on.
- Tremor A fine shake, usually in the hands.
- Gum swelling Brushing and flossing well helps.
- More hair on the face and body
- Headache and nausea Easier with food.
Tell your doctor — worth a call, not an emergency
- Blood pressure that keeps climbing
- Swelling in the ankles or less urine Can point to the kidneys.
- An infection that lingers
- Rising creatinine or potassium From your routine blood tests.
- A new lump or a changing mole Skin cancer risk rises with long use.
- Any new medicine or supplement Cyclosporine interacts with a long list, grapefruit included.
Stop and get care
- Fever with shaking chills or feeling very ill: Infection needs treating fast on this drug.
- Severe headache with confusion or a seizure
- Barely passing urine
What to Avoid
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- Grapefruit, grapefruit juice, pomelo and Seville oranges: They block the enzyme that clears cyclosporine, so blood levels rise unpredictably. The one food restriction that genuinely matters.
- St John's wort The opposite: it clears the drug faster, so it can stop working with no warning.
- Potassium supplements and salt substitutes Cyclosporine already raises potassium, and these add to it.
- Anti-inflammatory painkillers Ibuprofen and naproxen strain the same part of the kidney cyclosporine does. Ask which painkiller to use instead.
- Sun, tanning beds and UV phototherapy Skin cancer risk rises on cyclosporine, especially after a lot of PUVA. Sunscreen and covering up matter more than usual.
- Live vaccines Usually avoided while the immune system is suppressed. Check before any travel vaccine or nasal flu vaccine.
- Stopping or restarting on your own The monitoring is built around your blood level, so changes belong with the prescriber.
Monitoring
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Cyclosporine is monitored more closely than any other skin drug, and that monitoring is why it can be used at all. Blood pressure is measured at every visit, often at home. Kidney function is checked by blood test, twice before starting for a reliable baseline, then every couple of weeks for a month or two, then monthly once the dose is steady. The same draws cover potassium, magnesium, uric acid, liver enzymes, blood counts and cholesterol. Drug blood levels are routine in transplant care, not usually needed at dermatology doses.
Two numbers drive the decisions. A rise in creatinine of about a quarter above your baseline, confirmed on a repeat test, means dropping the dose; about half means stopping. New high blood pressure means lowering the dose or adding a blood pressure medicine, and the choice matters: diltiazem and verapamil push levels up, amlodipine does not.
The interaction list is long. Drugs that raise levels include the azole antifungals, clarithromycin and erythromycin, and some HIV and hepatitis C medicines. Drugs that lower it include rifampin, phenytoin, carbamazepine and St John's wort. It also raises statin levels, so that dose is often reduced, and it interacts with colchicine, digoxin, methotrexate and potassium-sparing water tablets. Bring every prescription, supplement and herbal product to the first visit.
The time limit is the point of all this. Kidney damage builds with continuous use and part of it can be permanent, so guidelines cap continuous treatment at about a year and most dermatology courses are far shorter. Long or repeated use also raises the risk of skin cancer, lymphoma and serious infection, so skin checks continue afterward.
If You Stop
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There is no withdrawal syndrome, but the dose steps down over a few weeks rather than stopping outright, because stopping abruptly brings the disease back faster. Relapse is expected. Eczema and psoriasis return within weeks to a few months unless something else is running, so the taper is timed around the next treatment: a biologic, methotrexate, phototherapy or a strong topical routine. Most side effects reverse. Extra hair growth fades, gum swelling settles, tingling and headaches go quickly, blood pressure returns toward baseline. Kidney function often recovers after a short course, but some loss can persist after long or repeated ones — the main argument for short courses.
Cost
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Generic capsules are cheap next to biologics, part of why the drug is still used. Branded versions cost more without working better. The visible cost is not the whole cost. Repeated blood tests, blood pressure checks and appointments add up, and none are optional. It is cheaper per month than a biologic but taken for only a few months, so the comparison depends on what comes after. Insurance generally covers it for severe psoriasis. Eczema coverage varies more in the United States, where that use is off-label.
Ask Your Doctor
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How It Compares
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Myths
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- "It is chemotherapy." It is not. It does not kill dividing cells. It blocks one signal inside immune T cells, a different mechanism with a different side effect profile. Monitoring is still close, but for blood pressure and kidneys.
- "If it is working, I can just stay on it." The limit is not whether it works. It is what continuous use does to the kidneys and blood pressure, plus the rising risk of skin cancer and infection. Hence the exit planned from the start.
- "Herbal supplements are safe because they are natural." St John's wort can drop cyclosporine levels enough for the disease to come back, and grapefruit and related fruits push levels up. Supplements and teas belong on the list you show the prescriber.
- "The blood tests are just paperwork." Rising blood pressure and falling kidney function cause no symptoms until advanced. The tests are the only way to catch either early.
Questions Patients Ask
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How quickly will it work?
Faster than anything else for these conditions. Itch improves within days, clearing by four to six weeks.
How long can I stay on it?
Most courses run months. Guidelines cap continuous use at about one year, because kidney effects build and some can be permanent.
Why do I need my blood pressure checked so often?
It raises blood pressure in a meaningful share of people, and that causes no symptoms. Catching it early usually means lowering the dose rather than stopping.
Can I drink grapefruit juice?
No. Grapefruit, pomelo and Seville oranges block the enzyme that clears it, so levels rise unpredictably. Other citrus is fine.
Why is hair growing where it did not before, and why are my gums sore?
Both are dose-related. Not dangerous, usually better if the dose comes down, and gone after stopping.
Will my skin flare again when I stop?
Usually, within weeks to a few months, unless another treatment is running. Planning that before the taper is the point of the short course.
References
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- Davis DMR, Drucker AM, Alikhan A, et al. Guidelines of care for the management of atopic dermatitis in adults with phototherapy and systemic therapies. Journal of the American Academy of Dermatology. 2024. — Journal of the American Academy of Dermatology, 2024
- Chu AWL, Wong MM, Rayner DG, et al. Systemic treatments for atopic dermatitis (eczema): Systematic review and network meta-analysis of randomized trials. The Journal of allergy and clinical immunology. 2023. — The Journal of allergy and clinical immunology, 2023
- Rüegg L, Pluma A, Hamroun S, et al. EULAR recommendations for use of antirheumatic drugs in reproduction, pregnancy, and lactation: 2024 update. Annals of the rheumatic diseases. 2025. — Annals of the rheumatic diseases, 2025
- Chu AWL, Oykhman P, Chu X, et al. Comparative efficacy and safety of biologics and systemic immunomodulatory treatments for chronic urticaria: Systematic review and network meta-analysis. The Journal of allergy and clinical immunology. 2025. — The Journal of allergy and clinical immunology, 2025
- Kaur M, Diaz MJ, Anthony M, et al. Treatments for Pyoderma Gangrenosum: A Systematic Review and Single-Arm Meta-Analysis of Systemic Therapies. International wound journal. 2025. — International wound journal, 2025
- Mateos-Haro M, Novoa-Candia M, Sánchez Vanegas G, et al. Treatments for alopecia areata: a network meta-analysis. The Cochrane database of systematic reviews. 2023. — The Cochrane database of systematic reviews, 2023