X
More than 60,000 patients use Brite
4.6 stars
Your health finally understandable with Brite
Enter email and you're done. No subscription, no credit card.
Search, tap and you're done. Over 3,400 medicines.
Check, remind, get an overview.
Sarah K., 34
I finally understand my therapy. The app reminds me, answers my questions — and I don't feel alone with it anymore.
Isotretinoin is the most effective acne medication of all and the only one that makes a lasting cure possible. About 80% of all adolescents have acne during puberty, and in a portion of them a severe, scarring form develops. Because of its strong harm to an unborn child, however, a legally mandated pregnancy prevention programme applies — one of the strictest safety requirements attached to any medication.
See more detail.gif)
Isotretinoin is strongly harmful to the unborn child. For women of childbearing potential, the pregnancy prevention programme applies without exception. With a suspicion of pregnancy, stop immediately. Therapy only under dermatological supervision. Last updated: May 2026.
Isotretinoin is the most effective medication against severe acne — and at the same time the one with the strictest safety profile. Below are the most important key facts for a quick orientation; the individual points are explained in detail in the following chapters.
| Property | Details |
|---|---|
| Active substance | Isotretinoin |
| Trade names | Aknenormin, Isoderm, Isotret, and others; formerly Roaccutane; numerous generics |
| ATC code | D10BA01 |
| Substance class | Retinoid (vitamin A derivative) for systemic acne treatment |
| Mechanism of action | Shrinking of the sebaceous glands and a drastic reduction of the sebum production (up to 90 %), anti-inflammatory, normalisation of the keratinisation |
| Intake | Orally as a capsule — always with a fatty meal for good absorption |
| Usual dosage | 0.3–0.5 mg per kg body weight/day, the goal: a cumulative total dose |
| Therapy duration | Mostly 6–9 months, until the individual target total dose is reached |
| Highest warning | Strongly harmful to the unborn child (teratogenic) — the pregnancy prevention programme is mandatory |
| No blood donation | During and 1 month after the therapy |
| Prescription | Only by dermatologists; prescription validity limited |
| Prescription status | Yes |
| Most important note | Gap-free contraception (in women of childbearing potential), monthly pregnancy tests, laboratory checks |
Isotretinoin is the most effective medication against severe acne — a derivative of vitamin A (a retinoid) that is taken in tablet form. It is the only acne medication that attacks all four formation factors of acne simultaneously and leads to a permanent healing in many patients. It was long known under the brand name Roaccutane; today there are numerous preparations (Aknenormin, Isoderm, and others).
Because of its enormous effectiveness, isotretinoin is a life-changing therapy for many people with severe, scarring acne — precisely because severe acne can have considerable physical (scars) and psychological (self-worth, social isolation) consequences. At the same time, isotretinoin is a highly potent medication with a considerable side-effect profile, which may only be used under specialist (dermatological) control.
By far the most important topic with isotretinoin is the strong harm to the unborn child (teratogenicity): an intake during pregnancy leads, with a high probability, to severe malformations. That is why a legally prescribed pregnancy prevention programme applies, which we explain in detail. This topic is not a marginal aspect, but the core of the safe use.
Isotretinoin is a retinoid and works through binding to retinoic acid receptors in the cells, which influence the gene activity. The special thing: it attacks all four main factors of acne formation simultaneously — no other acne medication can do that.
This comprehensive effect explains why isotretinoin is so effective and enables a permanent healing in many patients — even after stopping, the skin often stays clear long-term, because the sebaceous glands were lastingly shrunk.
Isotretinoin is absorbed clearly better when it is taken with a fatty meal — an important practical point. It is metabolised in the liver. After stopping, it is excreted relatively quickly — the harm to the unborn child, however, persists for some time, which is why the contraception must be continued even after the end of the therapy (see the safety programme).
The most important chapter of this article — because here it is about the avoidance of the most severe harm. Isotretinoin is strongly teratogenic (harmful to the unborn child): an intake during pregnancy leads, with a high probability, to severe malformations (brain, heart, face, ears) and miscarriages. Even small amounts are enough. That is why there is in the EU a legally prescribed pregnancy prevention programme (PPP) for women of childbearing potential.
The core points of the pregnancy prevention programme for women of childbearing potential can be structured by therapy phase:
| Phase | Measure | Note |
|---|---|---|
| 1 month BEFORE the start of therapy | Begin reliable contraception (at least 1, better 2 complementary methods) | An education conversation and a negative pregnancy test |
| Start of therapy | A negative pregnancy test under medical supervision | Written education and confirmation by the patient |
| During the entire therapy | Gap-free contraception + monthly pregnancy tests | Prescription valid only a few days, the dispensed amount limited |
| Until 1 month after the end of therapy | Continue contraception gap-free, a final pregnancy test | The harm to the unborn child still persists |
| During + 1 month after the therapy | No blood donation | Blood could be transferred to a pregnant woman |
| In general | Never pass on to others | Above all not to women of childbearing age |
There are also notes for men: although no relevant teratogenic amount is transferred via the sperm, the doctor's instructions and the prohibition on passing on the medication should nevertheless be observed. The pregnancy prevention programme is not a bureaucratic obstacle, but an essential protection — its consistent adherence is the precondition for the safe use of this very effective medication.
Isotretinoin is not a first-choice remedy, but is used specifically with severe or therapy-resistant forms:
The indication setting and the entire therapy belong in dermatological hands — in Germany isotretinoin is prescribed and supervised by dermatologists.
The dosage is based on the body weight and is set individually. An important concept is the cumulative total dose — the total amount reached over the entire therapy, which is decisive for the long-term success:
Isotretinoin is exceptionally effective — it is the only acne medication that enables a permanent healing. In the majority of patients, the acne heals largely under a complete therapy, and in many the skin stays clear long-term even after stopping.
Course of the effect: at the start a temporary worsening can occur (a separate chapter). The clear improvement mostly sets in after 1 to 2 months and increases further over the therapy. The full result often shows only towards the end or after the conclusion of the therapy — even after stopping the skin often improves further.
Relapses: in a part of the patients, the acne comes back fully or partly after the therapy — above all when the cumulative total dose was not reached or in very young patients. In these cases a second treatment cycle can be considered. Reaching the individual target total dose is the most important factor for a permanent healing.
Since isotretinoin reduces the sebum production drastically, drying-out signs almost always occur — they are the most common and most characteristic side effects and are well treatable:
These side effects are unpleasant, but manageable and completely reversible after the end of therapy. Consistent skincare (a separate chapter) makes the therapy clearly more bearable. Important: during the therapy, no cosmetic skin treatments such as dermabrasion, laser, or waxing — the skin is too sensitive (a risk of scars and wound-healing disorders).
Rarer and more serious: severe skin reactions, severe liver damage, a clear rise of the blood lipids (with a pancreatitis risk), pseudotumour cerebri (a benign rise of intracranial pressure — above all in combination with tetracyclines such as doxycycline, therefore avoid this combination). These are caught through the regular checks and education about warning signs.
An important and controversially discussed topic. For years there have been reports of depressive moods, mood swings, and in rare cases suicidal thoughts under isotretinoin. The scientific data situation on the causal connection is not clear — severe acne itself is a known risk factor for depression, and many studies even show an improvement of mental health through the successful acne treatment.
What that means practically: independently of the question of causality, caution and attention are required. The product information expressly points to the possible risk.
