Topical finasteride is a medication used to treat male and female pattern hair loss by blocking the conversion of testosterone into dihydrotestosterone (DHT), which can weaken hair follicles
. It is available as a spray or gel and is typically applied once or twice a day
. Some common side effects of topical finasteride include:
- Irritation, itching, or burning sensation at the application site
- Lightheadedness or redness where the solution is applied
- Decreased libido (sex drive)
- Erectile dysfunction
- Ejaculation problems/reduced semen volume
- Dizziness
- Allergic reactions (skin rash, itching, shortness of breath)
- Swelling in the face, eyelids, hands, or feet
More rare side effects reported in some topical finasteride studies include presyncope, conjunctivitis, headache, and oropharyngeal pain
. The side effects of topical finasteride are generally localized to the application site, such as scalp pruritus, burning sensation, irritation, contact dermatitis, and erythema
. Topical finasteride is often combined with topical minoxidil, as they work in different ways and can enhance each other's effectiveness
. However, it is essential to consult with a dermatologist or healthcare provider before starting any hair loss treatment, including topical finasteride
