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Evan Francis
Edited By: Evan Francis
Updated: 14/04/2022
Status: Checked

The article is for informational purposes and is compiled in accordance with official instructions.


Finasteride is a popular 5-alpha reductase inhibitor, best known by the brand names Proscar and Propecia. Both are manufactured by Merck. Although similar in action, the two finasteride products were developed for different reasons. Proscar first came on the market in 1992 to treat prostate hyperplasia or enlargement. Then in 1997, finasteride would be released under the brand name Propecia to combat male pattern baldness. Although the two common finasteride products are similar, Propecia is much stronger and contains almost five times as much finasteride as Propecia.

In addition to its original uses, finasteride has found welcome acceptance among some anabolic steroid users in recent years in an effort to combat androgenic side effects. Androgenic side effects can occur in many anabolic steroids, but in many the overall androgenic effects are not strong enough to cause concern. In addition, androgenic side effects are highly dependent on genetics; some men, even those who have received high doses of steroids associated with strong androgenicity, will not fall victim to related side effects. Genetics do matter when considering androgenic effects, body response and metabolism of androgen dihydrotestosterone (DHT).

Functions and features of finasteride

Finasteride is officially classified as a type II 5-alpha reductase inhibitor. The human body contains two types of reductase enzymes: type I and type II, with type II being responsible for about 2/3 of all dihydrotestosterone circulating in the body. Type II enzyme is mainly found in the skull and prostate gland, and to some extent in the skin. By introducing a type II 5-alpha reductase inhibitor such as finasteride, we now inhibit the ability of the 5-alpha reductase enzyme to metabolise certain hormones. In the case of finasteride, the hormone we are trying to suppress is DHT.

The effects of finasteride

The effects of finasteride are specifically designed to inhibit the reduction of testosterone to dihydrotestosterone, which occurs due to the metabolism of the testosterone hormone by the 5-alpha reductase enzyme. When we inhibit DHT, it can protect against hair loss. DHT has the ability to destroy hair follicles, but when finasteride is present, it can reverse the problem or rather prevent it. High levels of DHT can also lead to prostate enlargement, which is much more worrying than hair loss. The effects of finasteride are so strong on the prostate gland. Data has shown that 6 months of finasteride therapy can significantly even reduce prostate enlargement completely.

As we study the effects of finasteride, we need to look at them a little differently by looking at its use with anabolic steroids. Many anabolic steroids are already based on DHT; Steroids such as oxymetholone (anadrolone), metenolone (primobolan) and stanozolol (winstrol) are anabolic steroids derived from DHT. The 5-alpha reductase enzyme has nothing to metabolise, and consequently nothing to inhibit a related inhibitor such as finasteride. Then we have testosterone-derived anabolic steroids, and this is where finasteride's effects could prove useful for anabolic steroid users. However, this would only apply to certain testosterone-derived anabolic steroids, in particular testosterone (all forms), methyltestosterone (methandrene) and fluoxymesterone (halotestin).

When high testosterone levels are present in the body, the amount of the hormone which is metabolised by the 5-alpha reductase enzyme increases, and consequently a greater accumulation of DHT is possible. This may contribute to the development of androgenic effects, which can be counteracted with finasteride. It can protect against hair loss and prostate enlargement, but for hair loss it is only a benefit for those who are predisposed to male pattern baldness. If you are not predisposed, hair loss is impossible. If you are predisposed, at some point you will lose your hair no matter what you do, but high levels of DHT can accelerate the process. Using finasteride in this capacity can also help with acne, which sometimes occurs due to a strong androgenic atmosphere. However, again we are only talking about those who are genetically susceptible.

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Finasteride. Frequent questions
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This description is a simplified author's version from the site The description was created on the basis of information that is submitted in the official instructions for use from the drug itself.

Before buying and applying drugs of this active substance, it is necessary to consult with the doctor or sports trainer and get recommendations for use, as well as carefully read the instruction that was supplied in a drug packaging.

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