What should you know about Propecia 1mg from Merck?

Propecia contains finasteride, which reduces conversion of testosterone to dihydrotestosterone. That hormone pathway contributes to follicle miniaturisation in [Male Pattern Hair Loss](/conditions/androgenetic-alopecia/). It does not treat every cause of [Hair Loss](/symptoms/hair-loss/) and is not a suitable self-diagnosis for a sudden shed, scalp inflammation, or [Frontal Fibrosing Alopecia](/conditions/frontal-fibrosing-alopecia/). Brand, manufacturer, and supply route can vary, so check the packaging and active ingredient with a pharmacist.

Have a clinician confirm the pattern of thinning before starting. Share your medicines, fertility plans, liver history, and any mood or sexual-health concerns. Take it exactly as prescribed and do not double a missed dose. Keep follow-up appointments so hair density, scalp findings, and side effects can be reviewed over time. Discuss [Finasteride Treatment](/treatments/hair-restoration/finasteride-therapy/) and alternatives such as [Topical Minoxidil](/treatments/hair-restoration/topical-minoxidil/) if oral treatment is unsuitable. Pregnant people should not handle crushed or broken tablets.

Contact the prescriber promptly for depressed mood, suicidal thoughts, breast lumps or discharge, allergic swelling, or troublesome sexual symptoms. Sudden patchy loss, scalp pain, scaling, or a rapidly changing [Receding Hairline](/symptoms/receding-hairline/) needs assessment because another diagnosis may be present. Never stop or restart a prescription based only on online product claims.

Ask whether your hair-loss pattern fits finasteride, how progress will be monitored, which side effects require a call, how pregnancy exposure is avoided, and what alternatives are available if you cannot continue.