What side effects are possible?

Written by Dr. Christian Drerup
Updated on 22 May 2026
Side effects are possible and depend on the active ingredient and the dosage form. A brief overview:
- Topically applied minoxidil can irritate the scalp, for example with itching, redness or dryness.
- Orally taken active ingredients act throughout the body and can have systemic side effects, for example sexual dysfunction with finasteride.
Which side effects are relevant to your therapy is listed in the package leaflet of the respective medicine. Before a prescription is issued, the doctor checks your information for contraindications. If symptoms occur, discuss them early with your doctor so that the therapy can be adjusted.
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