Ciclosporin: 4 Skin Conditions It Treats And What To Expect
Ciclosporin is an immunosuppressant used short-term for severe skin conditions like eczema and psoriasis, with careful monitoring required for side effects.
What is ciclosporin?
Ciclosporin, also known as cyclosporine or cyclosporin A, is a potent immunosuppressant medication derived from the fungus Beauveria nivea (formerly Tolypocladium inflatum). It belongs to the class of calcineurin inhibitors and works by selectively inhibiting T-lymphocyte activation, thereby suppressing cell-mediated immune responses without broadly affecting humoral immunity. This mechanism makes it particularly valuable in dermatology for treating severe, inflammatory skin conditions that do not respond to conventional therapies.
Originally discovered in the 1970s, ciclosporin revolutionized organ transplantation by preventing graft rejection. In dermatology, it is approved for short-term use (typically up to 1 year) in conditions like severe atopic dermatitis and psoriasis. Microemulsified formulations, such as Neoral® and Sandimmun® Neoral®, improve bioavailability and reduce variability in absorption compared to older oil-based versions like Sandimmun®.
The drug is lipophilic, poorly water-soluble, and primarily metabolized by hepatic cytochrome P450 3A4 enzymes. It binds to cyclophilin inside T-cells, forming a complex that inhibits calcineurin, preventing the dephosphorylation and nuclear translocation of nuclear factor of activated T-cells (NFAT). This blocks interleukin-2 (IL-2) production and T-cell proliferation, effectively dampening inflammatory cascades in the skin.
Who is ciclosporin used for?
Ciclosporin is indicated for adults and children over 16 years with severe, refractory skin diseases. Primary dermatological uses include:
- Severe atopic dermatitis (eczema): For patients unresponsive to topical corticosteroids or where systemic steroids are contraindicated.
- Severe plaque psoriasis: Especially widespread or pustular forms not controlled by other therapies.
- Other indications: Pyoderma gangrenosum, severe urticaria, mastocytosis, and certain cases of lupus erythematosus or scleroderma.
It is a second- or third-line agent due to its side effect profile, reserved for short courses when benefits outweigh risks. In children under 16, use is off-label but supported by evidence for refractory eczema.
What does ciclosporin treat?
In dermatology, ciclosporin is highly effective for immune-mediated inflammatory disorders:
| Condition | Response Rate | Typical Duration |
|---|---|---|
| Severe atopic dermatitis | 60-80% clear/almost clear in 2-6 weeks | 3-6 months, max 1 year |
| Plaque psoriasis | 60-90% PASI improvement in 12-16 weeks | Continuous up to 1 year |
| Pustular/generalised psoriasis | Rapid clearance (1-2 weeks) | Short-term |
| Pyoderma gangrenosum | 50-70% healing | Variable |
Response is rapid, often within 2 weeks, but relapse is common upon discontinuation, necessitating gradual tapering. Long-term data show sustained efficacy with intermittent dosing in some psoriasis patients.
How is ciclosporin given?
Ciclosporin is administered orally as capsules or solution, or intravenously for acute severe cases. Dosing is individualised based on body weight, blood levels, and response.
- Adults (psoriasis): 2.5 mg/kg/day, divided BID; max 5 mg/kg/day.
- Adults (atopic dermatitis): Start 2.5-5 mg/kg/day; reduce to 2-3 mg/kg/day for maintenance.
- Children: 3-5 mg/kg/day, with close monitoring.
Blood trough levels should be maintained at 50-150 ng/mL (microemulsified) or 100-200 ng/mL (non-modified). Take consistently with or without food; avoid grapefruit juice, which inhibits metabolism.
What are the side effects of ciclosporin?
Ciclosporin carries significant risks, dose-dependent and increasing with treatment duration. Common effects include:
- Renal toxicity: Reduced glomerular filtration rate (GFR), hypertension (30-50% of patients).
- Hypertrichosis: Excessive hair growth (up to 88% in males, 100% in females; reversible in 3-7 months post-discontinuation).
- Gingival hypertrophy: Gum overgrowth (3-25%).
- Cutaneous: Acne (82%), oily skin, psoriasis follicularis.
- Systemic: Headache, tremor, nausea, fatigue, increased lipids.
Serious risks: Malignancy (skin cancer, lymphoma), infections, seizures, hepatotoxicity. Photosensitivity increases skin cancer risk; avoid UV therapy.
How is ciclosporin monitored?
Rigorous monitoring is essential:
| Baseline | Ongoing (weekly then monthly) | Frequency |
|---|---|---|
| BP, renal function (Cr, GFR), LFTs, lipids, FBC, urinalysis, BP | Blood levels, BP, Cr, lipids | Pre-treatment, then 2-weekly x3, monthly |
| Malignancy screen, viral serology (HBV/HCV) | Skin exam for cancer | 3-6 monthly |
Discontinue if Cr rises >30% above baseline, uncontrolled HTN, or malignancy.
Precautions when using ciclosporin
- Contraindicated in uncontrolled HTN, renal impairment, malignancy, pregnancy.
- Drug interactions: CYP3A4 inhibitors (ketoconazole), inducers (rifampicin).
- Sun protection mandatory; avoid live vaccines.
- Taper slowly to prevent rebound.
Alternatives to ciclosporin
Other immunosuppressants: Methotrexate, azathioprine, mycophenolate, biologics (dupilumab for eczema, secukinumab for psoriasis).
Frequently asked questions (FAQs) about ciclosporin
Q: How quickly does ciclosporin work for eczema?
A: Significant improvement often within 2 weeks; 60-80% achieve clear/almost clear skin by 6 weeks.
Q: Does hair growth from ciclosporin go away?
A: Yes, hypertrichosis reverses in 3-7 months after stopping.
Q: Can ciclosporin cause kidney damage?
A: Yes, renal toxicity is common; requires monitoring and is often reversible with dose reduction.
Q: Is ciclosporin safe long-term?
A: No, limited to 1 year due to cumulative risks; intermittent use possible in select cases.
Q: What diet restrictions with ciclosporin?
A: Avoid grapefruit; consistent food timing; low-salt for HTN.
References
- Cyclosporine (oral route) — Mayo Clinic. 2023-10-01. https://www.mayoclinic.org/drugs-supplements/cyclosporine-oral-route/description/drg-20075815
- Cosmetically Disfiguring Side Effects of Cyclosporine — PMC – NIH. 2012-05-28. https://pmc.ncbi.nlm.nih.gov/articles/PMC3358945/
- Ciclosporin — National Eczema Society. 2024-01-15. https://eczema.org/information-and-advice/treatments-for-eczema/ciclosporin/
- Ciclosporin (cyclosporin) — DermNet NZ. 2025-03-12. https://dermnetnz.org/topics/ciclosporin
- Cyclosporine — MedlinePlus. 2024-07-20. https://medlineplus.gov/druginfo/meds/a601207.html
- Cyclosporine Capsules: Uses & Side Effects — Cleveland Clinic. 2024-11-05. https://my.clevelandclinic.org/health/drugs/19532-neoral-or-gengraf-cyclosporine-oral-capsule
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