This information is for research and educational purposes only. No medical recommendations. Products are not approved for human use. For health questions, consult a doctor.

Lexicon

Skin, hair & anti-aging

Isotretinoin

The strongest treatment for severe acne - highly effective, but with a strict safety profile.

1 min read 0 sources Titration Updated June 2026
Class
Retinoid (vitamin A derivative, oral)
Use
Oral, 1x per day with fat
Half-life
about 10-20 hours
Status
Prescription, teratogenic

Getting started

Typical dosing (research context)

Per-day figures in mg, oral, with a fatty meal. Strictly contraindicated in pregnancy.

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What is Isotretinoin?

Isotretinoin (13-cis-retinoic acid) is an oral vitamin A derivative and the most effective treatment for severe, treatment-resistant acne. It can clear acne durably but has a strict safety profile - above all it is strongly harmful to a fetus.

This information is for research and educational purposes only. No medical advice.

How it works

Isotretinoin drastically shrinks the sebaceous glands and lowers sebum production, normalizes follicle keratinization and acts anti-inflammatory. It thus targets all the key acne mechanisms at once.

Use and dosing

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Important warning

Isotretinoin is strongly teratogenic - absolutely contraindicated in pregnancy as it causes severe birth defects. Reliable contraception before, during and after use is mandatory. This substance belongs strictly under medical supervision.

Side effects

  • Very common: dry skin, lips and eyes, sensitive skin.
  • Muscle and joint aches, headaches.
  • Rise in liver values and blood lipids - monitoring needed.
  • Rarely low mood; teratogenic (see warning).

Storage

Store dry and cool, protected from light. Out of reach of children.

Evidence

Sources

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In the shop

Isotretinoin in the catalog

Sizes, prices and availability for research use. Straight from the lexicon to the product page.

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