DHT and MPHL
Men with MPHL have elevated levels of DHT in their balding scalps. Scientists believe DHT contributes to the progressive shrinking of hair follicles and a decrease in the number of visible hairs.
DHT is a substance in the scalp that can shrink the hair follicle until it no longer produces visible hair. Scientists believe DHT and family history are key factors in hair loss. PROPECIA blocks the formulation of DHT in the scalp. Learn more about how PROPECIA works.
DHT is a substance in the scalp that can shrink the hair follicle until it no longer produces visible hair. Scientists believe DHT and family history are key factors in hair loss. PROPECIA blocks the formulation of DHT in the scalp. Learn more about how PROPECIA works.
This requires Flash to play. Click here to download.
Other causes of hair loss
- Illness
- Major surgery
- Disease
- Medications
- Alopecia areata
Talk to your doctor. He or she may determine the cause of your hair loss and recommend medical treatment.
PROPECIA was developed to treat mild to moderate male pattern hair loss on the vertex (top of head) and anterior mid-scalp area (middle front of head) in MEN ONLY. There is not sufficient evidence that PROPECIA works for receding hairlines at the temples.

PROPECIA is for the treatment of male pattern hair loss in MEN ONLY and should NOT be used by women or children.
In clinical studies for PROPECIA, a small number of men experienced certain sexual side effects, such as less desire for sex, difficulty in achieving an erection, or a decrease in the amount of semen. Each of these side effects occurred in less than 2% of men and went away in men who stopped taking PROPECIA because of them.
You may need to take PROPECIA daily for 3 months or more before you see a benefit from taking PROPECIA. If PROPECIA has not worked for you within 12 months, further treatment is unlikely to be of benefit.
PROPECIA is for the treatment of male pattern hair loss in MEN ONLY and should NOT be used by women or children.
In clinical studies for PROPECIA, a small number of men experienced certain sexual side effects, such as less desire for sex, difficulty in achieving an erection, or a decrease in the amount of semen. Each of these side effects occurred in less than 2% of men and went away in men who stopped taking PROPECIA because of them.
You may need to take PROPECIA daily for 3 months or more before you see a benefit from taking PROPECIA. If PROPECIA has not worked for you within 12 months, further treatment is unlikely to be of benefit.
PROPECIA can only work over the long term if you continue taking it. If you stop taking PROPECIA, you will likely lose any hair you have gained within 12 months of stopping treatment.
Know the facts. PROPECIA is available by prescription only, so the best thing to do is talk with your doctor.
You are encouraged to report negative side effects of prescription drugs to the FDA.
Visit www.fda.gov/medwatch, or call 1-800-FDA-1088.
PROPECIA and Helping make hair loss history are registered trademarks of Merck Sharp & Dohme Corp. a subsidiary of Merck & Co., Inc.
20951234(2)-04/10-PRP
You are encouraged to report negative side effects of prescription drugs to the FDA.
Visit www.fda.gov/medwatch, or call 1-800-FDA-1088.
PROPECIA and Helping make hair loss history are registered trademarks of Merck Sharp & Dohme Corp. a subsidiary of Merck & Co., Inc.
20951234(2)-04/10-PRP
