Propecia (Finasteride) is used to treat male pattern hair loss. Take one tablet daily or as directed by your doctor. This drug may be taken with or without meals. For maximum benefit, take Propecia regularly once a day. This drug usually must be taken regularly for 3 months for the benefits to be noticeable. Buy Propecia 5mg once treatment is stopped, any gain in hair quantity will be lost. Propecia prevents the conversion of testosterone to dihydrotestosterone (DHT) in the body. DHT is involved in the development of benign prostatic hyperplasia (BPH) and hair loss. This medication is used to treat symptoms of benign prostatic hyperplasia (BPH) in men with an enlarged prostate.