
Propecia is a steroid reductase inhibitor. It works by reducing the amount of the hormone dihydrotestosterone (DHT) in the body. This may block certain types of hair loss in men. Treating certain types of male pattern hair loss (androgenic alopecia) in men. The propecia study represents the longest reported controlled observations in men with MPHL, and showed that long term treatment with propecia led to significant and durable improvements. And treatment with propecia for 5 years led to sustained protection against further visible hair loss in nearly all (90%) of men, 65% of men taking propecia had increased hair counts after 5 years - none of the men taking placebo showed any increase. By comparison, 75% of the men in the placebo group showed further visible hair loss. Finally, the men taking propecia felt more satisfied with their appearance than men taking placebo. The study also showed that the long term use of propecia in men with MPHL is not associated with an increase in the incidence of adverse experiences, or any new safety concerns.
Do not use propecia if you are allergic to any ingredient in Propecia or you are pregnant or may become pregnant Contact your doctor or health care provider right away if any of these apply to you.
Some medical conditions may interact with Propecia . Tell your doctor or pharmacist if you have any medical conditions, especially if any of the following apply to you:
- if you are planning to become pregnant or are breast-feeding
- if you are taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement
- if you have allergies to medicines, foods, or other substances
- if you have a narrowing or blockage in the urinary tract, prostate cancer, or trouble urinating
- if you have a history of abnormal liver function tests or liver problems
Some medicines may interact with Propecia . However, no specific interactions with Propecia are known at this time.
Ask your health care provider if Propecia may interact with other medicines that you take. Check with your health care provider before you start, stop, or change the dose of any medicine.
Use Propecia as directed by your doctor. Check the label on the medicine for exact dosing instructions.
- An extra patient leaflet is available with Propecia . Talk to your pharmacist if you have questions about this information
- Take Propecia by mouth with or without food.
- Continue to take Propecia even if you notice improvement of your symptoms. Do not miss any doses.
- Taking Propecia at the same time each day will help your remember to take it.
- If you miss a dose of Propecia , skip the missed dose and go back to your regular dosing schedule. Do not take 2 doses at once.
The 5 year study was an extension of the original propecia clinical studies. At the end of the original study, 1,215 of the 1,553 men taking part stayed on for up to four more years, in four, one year extension studies.
In the original one year study half the men were taking propecia, and half were taking placebo (a dummy pill). Neither group knew which they were taking, real or dummy. At the end of the first year, the two groups were divided again. Half of the group that had been taking placebo for 1 year was put onto propecia, and half stayed on placebo. And the same happened to the group that had been taking genuine propecia for a year - half went on to placebo, and half stayed on propecia.
All the men stayed taking whatever they had been assigned for the next four years, except for the group who were switched from propecia to placebo, who were switched back onto propecia at the end of year 3.

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