Can isotretinoin cause hair loss? What UK patients should know

Amit Goyal

4 minutes ago

5 min read

Yes, isotretinoin can cause hair thinning or increased shedding, but this is uncommon and is usually mild and temporary. UK patient information says hair should return to normal after treatment ends. New shedding should still be discussed with your prescriber because isotretinoin is only one of several possible causes, and you should not reduce the dose or stop treatment without individual advice.

Editorial illustration of a patient noticing hair shedding while discussing isotretinoin side effects with a clinician

How common is hair loss with isotretinoin?

The UK Roaccutane patient leaflet classifies hair loss (alopecia) as a rare side effect, meaning it may affect up to 1 in 1,000 people taking that product. The British Association of Dermatologists (BAD) also lists hair loss as a possible effect and describes it as usually mild and temporary.[1][2]

Research estimates vary because studies have used different doses and definitions. A 2022 systematic review found limited evidence suggesting more reports with higher daily doses, but better studies were needed. It cannot predict an individual patient’s risk.[3]

What might isotretinoin-related shedding look like?

Medicine-related shedding often resembles telogen effluvium. More hairs than usual move into the resting phase of the hair cycle, then shed later. You may notice:

more hair in the shower, brush or on the pillow;
reduced ponytail thickness or overall volume; or
fairly even thinning across the scalp rather than one smooth bald patch.

Shedding may become noticeable around three months after a trigger. That trigger could be a medicine, illness, major stress, weight loss, restrictive dieting, iron deficiency, thyroid disease or hormonal change.[4]

Patchy loss, a receding patterned hairline, broken hairs, scalp redness or scale may have another cause and deserve examination.

What should I do if my hair starts shedding?

Contact the team prescribing your isotretinoin, particularly if the change is obvious, persistent or worrying. It helps to record:

when the shedding began and whether it is getting worse;
your current dose and any recent dose changes;
recent illness, surgery, weight loss or major stress;
changes in diet, periods or contraception;
all medicines and supplements; and
whether close relatives have patterned hair thinning.

Photographs of the parting, temples and hairline in consistent lighting can help. Blood tests are not automatic, but checks for iron deficiency, thyroid problems or other concerns may be appropriate.

Do not change the dose, take capsules on alternate days or stop treatment yourself. A prescriber may advise observation, investigation, dose adjustment or stopping treatment after considering acne control, severity and other explanations.

Will my hair grow back after isotretinoin?

In most reported cases, shedding is temporary. BAD and the UK patient leaflet say hair should return to normal after treatment finishes.[1][2] Recovery is not immediate because hair grows in cycles.

With telogen effluvium, the shedding phase commonly lasts three to six months. New growth then begins, but restoring previous volume and length can take several more months.[4] A delay after the medicine is changed or stopped does not necessarily mean the loss is permanent.

Arrange assessment if shedding persists, becomes severe or is accompanied by scalp symptoms. Another condition may have begun around the same time.

Can hair care or supplements prevent shedding?

No shampoo or supplement is proven to prevent isotretinoin-related hair loss. Sensible measures can reduce breakage:

use a gentle shampoo and conditioner that suit your scalp;
avoid repeatedly bleaching, chemically straightening or applying high heat;
keep tight braids, extensions and tight ponytails to a minimum;
eat a balanced diet with adequate protein and iron; and
avoid rapid weight-loss diets during treatment.

Do not start vitamin A supplements. UK product information says they must not be taken alongside isotretinoin because of vitamin A toxicity risk.[5] Show any “hair, skin and nails” product to your pharmacist or prescriber first.

Do not start biotin automatically either: evidence for routine use is limited, and high doses can interfere with blood tests. Minoxidil may suit some diagnosed hair-loss conditions but is not a universal solution for temporary shedding.

When should I seek prompt medical advice?

Contact your prescriber promptly if you develop:

rapid or extensive hair loss;
clearly defined bald patches;
painful, inflamed, crusted or scarred areas of scalp;
loss of eyebrows or eyelashes;
hair loss with marked fatigue, weight change or other new symptoms; or
distress that is affecting your mood or daily life.

Hair loss alone is not usually an emergency. Follow your treatment team and packet leaflet. Seek urgent help for a severe allergic reaction, serious mental-health symptoms, persistent severe headache with visual change, or yellowing of the skin or eyes.[1][2]

Suspected side effects can also be reported through the MHRA Yellow Card scheme. A report does not prove that the medicine caused the symptom, but it helps regulators monitor safety patterns.[6]

Does hair loss mean isotretinoin is unsuitable for me?

Not necessarily. Isotretinoin is reserved for severe acne that has not responded adequately to standard treatment, especially where permanent scarring is a risk. Benefits and risks must be reviewed together.

UK safeguards were updated on 22 January 2026. The lead prescriber must have systemic-retinoid expertise, confirm clinical indication, provide information and continue required monitoring. Pregnancy-prevention, mental-health and sexual-function safeguards remain in place.[7]

Frequently asked questions

Does a higher dose definitely cause more hair loss?

No. Limited studies suggest a possible association, but the evidence is not strong enough to predict who will be affected. Never alter the dose without the prescriber.

Should I count the hairs I lose each day?

Usually not. Daily counts are difficult to interpret and can increase anxiety. Consistent photographs and a short symptom timeline are often more useful.

Can isotretinoin cause permanent baldness?

UK patient information describes the usual effect as temporary. Persistent or patterned loss should be assessed for other causes.

Should I stop treatment before a hair-loss appointment?

Do not stop solely to test whether shedding improves. Contact the prescribing team so that acne severity, treatment progress and the hair change can be considered together.

Taking the next step

If you are considering isotretinoin, the first step is an acne assessment—not a request for a prescription. If you already take it and notice shedding, contact your prescribing team. Read mySkinDoc’s guide to isotretinoin side effects or explore its doctor-led acne and isotretinoin pathway. Isotretinoin is not suitable for everyone, and consultation does not guarantee a prescription.