Rogaine and Propecia
Rogaine (minoxidil) and Propecia (finasteride) are two drugs approved of by the FDA for the treatment hair loss. Both of these drugs were originally developed for use in the treatment of serious illnesses: minoxidil for high blood pressure; finasteride for benign prostate enlargement (BPH).
Rogaine is a topical solution sprayed or massaged into the thinning areas of the scalp. The scientists at Upjohn Pharmaceutical who developed this drug are not exactly sure how it works, but they have some theories.
One theory is that because the drug is a vasodilator it might dilate the blood vessels in the scalp thereby increasing circulation to the hair follicles. Other drugs, also vasodilators, do the same thing, but these drugs don't halt hair loss or grow new hair. So there must be some additional active ingredient in Rogaine that promotes stabilization or regrowth of hair.
Another theory is that Rogaine might have a stimulating effect on skin cells in the scalp thereby allowing the hair follicles to grow back to a size that may produce a healthy hair, a terminal hair.
And the third theory, the most likely one, is that Rogaine might have a beneficial effect on the hair cycle, keeping the follicles longer in the growing stage and perhaps shorter in the resting stage. This would give the hair a chance to grow longer and thicker.
The other drug Propecia was developed by Merck & Company. It's a pill. It's taken orally. Scientists at Merck say that this drug works by slowing down the conversion of testosterone into the more potent hormone DHT. It does this by partially neutralizing the enzyme 5-alpha reductase, the enzyme that catalyzes the conversion. Studies done by Merck indicate that patients receiving a pill with 1 mg of finasteride each day decreased the DHT in scalp tissue by almost 60 percent. DHT shortens the growing stage of the hair cycle and possibly harms areas within the follicle causing them to shrink (miniaturize). Read my article - DHT: the full story - for a detailed look at the benefits and the possible side effects of Propecia.
Both of these drugs are relatively safe, but if a person stops using them, all the benefits that have accrued from their use will disappear after a short time.
These drugs are effective in regrowing hair in the crown area of the head in approximately 35% of the people using them. (Effective meaning a moderate to dense growth of new terminal hair within one year.) There is no clear research yet that indicates that these drugs have much effect on the frontal hairline.
Rogaine can be used by both men and women; Propecia can be used by men only. A very small percentage of men on Propecia, perhaps one percent, will experience a lessening of the sex drive and a decrease in their ejaculate volume. These side effects will disappear once use of the drug is discontinued. (The hair that has been possibly regained will also disappear when the drug is discontinued.)
To summarize: Rogaine is a follicle stimulator, whereas Propecia a DHT inhibitor. Both of these drugs are legitimate, helpful drugs; there are perhaps hundreds of other drugs on the market that are completely useless.
Read my article - Dutasteride Evaluation - for an analysis of this new DHT inhibitor that blocks both type I and type II isoenzymes of 5-alpha reductase.
Possibly My Approach to hair loss--a regimen of scalp exercises--will help improve the effectiveness of these drugs. The medical term for one mode of treatment helping to increase the effectiveness of another mode is potentiation.