Propecia prevents the conversion of testosterone to dihydrotestosterone (DHT) in the body.
Propecia is used for the treatment of male pattern hair loss on the vertex and the anterior mid-scalp area. Male pattern hair loss is a common condition in which men experience thinning of the hair on the scalp. Often, this results in a receding hairline and/or balding on the top of the head. Propecia is for use by men only and should not be used by women or children.

The health and medical information provided here is for general purposes only and is not a substitute for the expertise and judgment of your physician, or other health care professional. It should not be understood to indicate that the use of this medicine is safe, appropriate or effective for you. Always consult your health care professional before using this, or any other, drug.

Propecia should never be taken by a woman or a child. Finasteride can be absorbed through the skin, and women or children should not be permitted to handle Propecia tablets.

Before taking Propecia, tell your doctor if you have ever had an allergic reaction to finasteride, or to a similar medicine called dutasteride (Avodart).

Although Propecia is not for use by women, this medication can cause birth defects if a woman is exposed to it during pregnancy. Propecia tablets should not be handled by a woman who is pregnant or who may become pregnant. Propecia tablets are coated and will prevent contact with the active ingredient during normal handling, provided that the tablets are not broken or crushed. If a woman accidentally comes into contact with this medication from a broken or crushed tablet, wash the area with soap and water right away. Call your doctor at once if you notice any breast lumps, pain, nipple discharge, or other breast changes. These may be signs of male breast cancer.

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat. Call your doctor at once if you notice any breast lumps, pain, nipple discharge, or other breast changes. These may be signs of male breast cancer.

Less serious Propecia side effects may include:

feeling like you might pass out;

swelling in your hands or feet;

pain in the testicles;

impotence, loss of interest in sex, or trouble having an orgasm;

abnormal ejaculation;

swelling or tenderness in your breasts;

dizziness, weakness;

headache;

runny nose; or

skin rash.

Take Propecia exactly as prescribed by your doctor. Do not take it in larger amounts or for longer than recommended. Follow the directions on your prescription label.

Take this medicine with a full glass of water.

Propecia can be taken with or without food.

It is important to use Propecia regularly to get the most benefit. You may need to take Propecia daily for three months or more before you see a benefit. Propecia can only work over the long term if you continue taking it. If the drug has not worked for you in twelve months, further treatment is unlikely to be of benefit. If you stop taking Propecia, you will likely lose the hair you have gained within 12 months of stopping treatment. You should discuss this with your doctor. Store Propecia at room temperature away from moisture, heat, and light. Keep the bottle tightly closed when not in use.