Acitretin is a second-generation systemic retinoid (active metabolite of etretinate) used for the treatment of severe psoriasis (including plaque, pustular, and erythrodermic types) that is unresponsive to conventional therapy. It is also used off-label for other keratinization disorders including lichen planus, pityriasis rubra pilaris, and ichthyosis. Unlike isotretinoin, acitretin does not significantly affect sebaceous gland function and is not used for acne.
Pregnancy, must not conceive for at least 3 years after discontinuation (teratogen; converted to etretinate with alcohol)
Breastfeeding
The bottom line
Evidence rating strong. Most-documented uses: effective for severe plaque, pustular, and erythrodermic psoriasis, enhances efficacy of phototherapy (puva, uvb) when combined, useful for disorders of keratinization. 10 sources indexed (1989–2024), with 4 interaction records on file.
The science
How it works, mechanistically.
Core mechanism
Binds to retinoic acid receptors (RAR) and retinoid X receptors (RXR), modulating gene expression involved in cell proliferation, differentiation, and keratinization. In psoriasis, it normalizes the accelerated epidermal proliferation, reduces keratinocyte hyperproliferation, and has anti-inflammatory and immunomodulatory effects. It inhibits IL-6, reduces neutrophil chemotaxis, and modulates T-cell function.
Class
Retinoid / Dermatologic
Absorption
Fat-soluble; take with food
Dosing
Dosing & protocol.
Common range
25-50 mg/day with the main meal; start at 25 mg/day and adjust based on response and tolerability (as prescribed by your physician)
Recommended form
Oral capsule; take with main meal to optimize absorption
Absorption is enhanced when taken with food, especially a fatty meal. Oral bioavailability ~60%. Important: if combined with alcohol, acitretin is converted to etretinate, which has an extremely long half-life (120 days), prolonging teratogenic risk.
Alcohol can convert acitretin back into etretinate, a much more lipophilic retinoid with a very long elimination time. This is especially dangerous for anyone who could become pregnant because it can extend teratogenic risk long after acitretin would otherwise clear. The concern is not solved by separating doses because ethanol changes acitretin metabolism systemically.
Recommendation: Do not drink alcohol while taking acitretin. If pregnancy is possible, avoid alcohol during treatment and for at least 2 months after stopping acitretin, and follow your prescriber's contraception and pregnancy-testing plan exactly. Tell your prescriber if you drank alcohol while on acitretin.
Acitretin is a systemic retinoid with vitamin A-like toxicity. Adding preformed vitamin A supplements can stack retinoid effects and increase the risk of headache, severe dry skin and mucosa, liver enzyme elevations, hypertriglyceridemia, bone symptoms, and teratogenicity. Risk is highest with high-dose vitamin A, cod liver oil, or multiple multivitamins.
Recommendation: Do not take vitamin A supplements, cod liver oil, or retinoid-containing products while on acitretin unless your dermatologist specifically directs it. Check multivitamin labels for retinol, retinyl palmitate, retinyl acetate, or vitamin A. Seek care promptly for severe headache, vision changes, jaundice, or pregnancy exposure.
Acitretin can raise triglycerides, and fish oil may help reduce retinoid-associated hypertriglyceridemia. Direct evidence is strongest for isotretinoin and etretinate, while acitretin is closely related to etretinate and is monitored for the same lipid problem. This is adjunctive lipid support and should not replace dose adjustment or prescription lipid therapy when triglycerides are high.
Recommendation: Fish oil is a reasonable option to discuss if triglycerides rise on acitretin. Continue fasting lipid monitoring and follow your dermatologist's plan for dose changes if levels become unsafe. Avoid very high fish oil doses if you have bleeding risk or take anticoagulants.
Concentrated fish oil may help manage triglyceride elevations during acitretin therapy. Evidence comes from systemic retinoid studies and acitretin guidelines emphasizing lipid monitoring rather than from a large acitretin-specific omega-3 trial. The combination is supportive when triglycerides are borderline or mildly elevated.
Recommendation: If your triglycerides rise while taking acitretin, ask whether a concentrated EPA/DHA product is appropriate. Continue fasting lipid checks and do not use fish oil to justify ignoring high triglycerides. Keep your dermatologist informed about the exact dose.
Wu MN, Zhou LJ, Zhou DM. Xiyanping injection combined with acitretin for psoriasis vulgaris: A systematic review and meta-analysis. Frontiers in pharmacology. 2022
Geng A, Pei T, Zhao X et al.. A Meta-analysis of Xiaoyin Granules Combined with Acitretin Capsule in the Treatment of Psoriasis Vulgaris. Computational and mathematical methods in medicine. 2022
Olsen EA, Weed WW, Meyer CJ et al.. A double-blind, placebo-controlled trial of acitretin for the treatment of psoriasis. Journal of the American Academy of Dermatology. 1989
Shim PJ, Quintos JL, Faraz K et al.. A report on the safety of acitretin use in patients with renal failure on haemodialysis. Clinical and experimental dermatology. 2024
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