Women still capable of childbearing should not use or handle crushed Propecia tablets. Propecia can cause birth defects in male fetuses.
Propecia belongs to the group of medicines called enzyme inhibitors. It is used to treat urinary problems caused by enlargement of the prostate. Propecia may decrease the severity of symptoms in men with very enlarged prostates and mild to moderate symptoms. Propecia may also reduce the chance that surgery will be needed.
Propecia blocks an enzyme called 5-alpha-reductase, which is necessary to change testosterone to another hormone that causes the prostate to grow. As a result, the size of the prostate is decreased. Propecia is also used to stimulate hair growth. If hair growth occurs, it is usually after about 3 months of use, and lasts only as long as the Propecia is taken. Any new hair will be lost within 1 year after Propecia is stopped.
Be sure to tell your doctor of any allergies you have whether it is to medication or food, preservatives, or dyes. Also, tell your doctor of any other medications you are taking, including vitamins and supplements, and any medical conditions you may have.
It is very important that you take this medicine exactly as your doctor tells you to. If you miss a dose of this medicine, take it as soon as you remember, unless it is almost time for your next dose. Do NOT double doses.
Tell your doctor as soon as possible if any of the following side effects occur: breast enlargement and tenderness; skin rash; or swelling of lips.
PROPECIA (finasteride), a synthetic 4-azasteroid compound, is a specific inhibitor of steroid Type II 5a-reductase, an intracellular enzyme that converts the androgen testosterone into 5a-dihydrotestosterone (DHT). Finasteride is 4-azaandrost-1-ene-17-carboxamide,N- (1,1-dimethylethyl)-3-oxo-, (5a,17b)-. The empirical formula of finasteride is C23H36N2O2 and its molecular weight is 372.55. PROPECIA tablets for oral administration are film-coated tablets that contain 1 mg of finasteride and the following inactive ingredients: lactose monohydrate, microcrystalline cellulose, pregelatinized starch, sodium starch glycolate, hydroxypropyl methylcellulose, hydroxypropyl cellulose LF, titanium dioxide, magnesium stearate, talc, docusate sodium, yellow ferric oxide, and red ferric oxide.
Propecia has the following structural formula: