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How long does Alitretinoin take to work?

Updated Sep 7, 20262 min readAnswer
On this pageShort answer What to expect while alitretinoin works Common questions Related questions Sources
Short answer

**Alitretinoin works slowly: expect the first visible changes after roughly 4 to 8 weeks of consistent use, with a fuller response often taking 12 weeks or more.**

The timeline depends on which form you are using. In the US, alitretinoin is available as a 0.1% topical gel applied to skin lesions of Kaposi sarcoma, and lesions may keep improving for as long as you continue treatment. Oral alitretinoin, used in the UK and some other countries for severe chronic hand eczema, is given in courses of about 12 to 24 weeks and is not FDA approved in the US. Skin irritation, redness, and peeling at the treated area often appear in the first two weeks, before any improvement, which can make the medicine feel like it is not working. Applying it on schedule, protecting treated skin from sun, and taking photos every two weeks make real progress much easier to judge.

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What to expect while alitretinoin works

1Give it 12 weeks:Judge the topical gel over about three months of consistent use rather than week to week.
2Track with photos:Take pictures of the same lesions in the same light every two weeks so slow change is visible.
3Expect irritation first:Redness, peeling, and itching at the treated area are common early and are not a sign the drug failed.
4Adjust the schedule, not the amount:If irritation is heavy, ask your clinician about applying less often instead of stopping or piling on more gel.
5Avoid pregnancy:Retinoids cause birth defects, so use reliable contraception and tell your clinician right away if you could be pregnant.
6Call sooner if lesions worsen:New spreading lesions, severe blistering, swelling, or pain need a clinician visit rather than more waiting.

Common questions

How long does Alitretinoin take to work?

Alitretinoin is a retinoid, and retinoids change skin gradually. The US product is a 0.1% topical gel for cutaneous lesions of Kaposi sarcoma, applied two to four times a day and continued for as long as you are getting benefit. Some lesions begin to flatten or fade within a few weeks; others need 8 to 14 weeks of steady use. Oral alitretinoin for severe chronic hand eczema is prescribed in the UK and elsewhere in courses lasting about 12 to 24 weeks, but it is not approved in the US. Irritation at the application site commonly arrives before improvement does. Alitretinoin can cause birth defects, so pregnancy must be avoided during treatment.

About this page. Written and maintained by the Pymander Health team. Last updated September 7, 2026.

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