Start with the pattern, not the product
Male-pattern hair loss usually develops gradually, often with recession at the temples or thinning at the crown. Sudden shedding, patchy loss, an inflamed scalp or hair loss with fatigue and weight change may point to a different cause and deserves assessment before treatment.
Finasteride reduces the conversion of testosterone to dihydrotestosterone (DHT), a hormone involved in shrinking susceptible hair follicles. It is intended to slow further loss and may improve growth for some men. It cannot restore a follicle that is no longer active, and a result is never guaranteed.
Results are measured in months
Hair grows slowly, so early progress is easy to misjudge. Consistent photographs in the same light are more useful than checking in the mirror every day. If treatment helps, the benefit generally needs ongoing use; hair loss may resume after stopping.
Topical minoxidil works differently and may be considered alone or alongside another approach. It can cause temporary shedding when started and must be used as directed. A prescriber can explain which option fits your pattern, preferences and medical history.
The safety conversation matters
Finasteride can cause sexual side effects such as reduced libido or difficulty getting an erection. The MHRA also warns about depression and suicidal thoughts, and notes that sexual dysfunction has sometimes persisted after treatment stopped. Tell the prescriber about any history of depression or suicidal thoughts before starting.
If you develop depression or suicidal thoughts while taking finasteride 1 mg for hair loss, stop taking it and contact a doctor promptly. Discuss sexual side effects with your prescriber. Always read the patient information leaflet supplied with the medicine.
Sources
This guide is for general information. It cannot diagnose you or confirm that a medicine is safe for you. A clinician must assess your individual health and medicines. Call 999 in an emergency or contact NHS 111 for urgent advice.