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Glossary5α-reductase

enzyme converting testosterone into potent dihydrotestosterone (DHT)

5α-reductase is an enzyme that converts testosterone into dihydrotestosterone (DHT), a more potent androgen hormone. This enzyme plays a significant role in various biological processes, including the development of male characteristics and the regulation of hair growth. Inhibitors of 5α-reductase, such as finasteride, are commonly used to treat conditions like male pattern baldness and benign prostatic hyperplasia.

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Chemical Mechanism of the Covalent Modification of 5-Alpha-Reductases by Finasteride as Probed by Secondary Tritium Isotope Effects

research Chemical Mechanism of the Covalent Modification of 5-Alpha-Reductases by Finasteride as Probed by Secondary Tritium Isotope Effects

12 citations, March 1995 in “Journal of the American Chemical Society”

Finasteride modifies 5-alpha-reductases through a two-step process, affecting inhibitor potency and possibly causing side effects.

research Species Differences in Prostatic Steroid 5α-Reductases of Rat, Dog, and Human

193 citations, August 1985 in “Endocrinology”

Different animals have unique versions of the enzyme that changes testosterone into another hormone, which is important for creating effective treatments for prostate and hair loss conditions.

Pharmacokinetic Parameters and Mechanisms of Inhibition of Rat Type 1 and 2 Steroid 5α-Reductases: Determinants for Different In Vivo Activities of GI198745 and Finasteride in the Rat

research Pharmacokinetic Parameters and Mechanisms of Inhibition of Rat Type 1 and 2 Steroid 5α-Reductases: Determinants for Different In Vivo Activities of GI198745 and Finasteride in the Rat

22 citations, October 2001 in “Biochemical Pharmacology”

GI198745 is more potent and longer-lasting than finasteride, potentially better for treating hair loss.

research Synthesis and Activity of 8-Substituted Benzo[c]quinolizin-3-ones as Dual Inhibitors of Human 5α-Reductases 1 and 2

9 citations, November 2004 in “Bioorganic & Medicinal Chemistry Letters”

New compounds were made that effectively block enzymes related to prostate issues and hair loss.

research 5α-Reductases in Human Physiology: An Unfolding Story

44 citations, July 2012 in “Endocrine Practice”

We need to learn more about 5α-reductases and neuroactive steroids to safely make drugs targeting these enzymes.

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community What Works to Restore Hairloss for Cis-Males? Not Much

in Treatment 18 upvotes 4 years ago

Hair regrowth treatments for cis-males include Minoxidil, Finasteride, and RU58841. Estrogen and testosterone blockers can help restore hair loss but may not suit everyone.

community Finasteride affects both 5a reductase and 5b reductase

7 upvotes 5 years ago

Finasteride not only inactivates the 5a reductase enzyme but also affects the 5b reductase enzyme in a dose-dependent manner, which can impact sexual behavior and brain activity. The user experienced significant hair regrowth and side effects on 1mg of finasteride, which diminished after reducing the dose to 0.5mg, leading to no side effects and further hair improvement.

community From the research study: "Dihydrotestosterone and the concept of 5a-reductase inhibition in human benign prostatic hyperplasia" - G. Bartsch, R.S. Rittmaster, H. Klocker (2002) in the "World Journal of Urology".

in Research/Science 23 upvotes 2 years ago

Dutasteride is a stronger 5AR inhibitor than finasteride and can significantly lower DHT levels. Reduced doses of dutasteride may lower side effects.

community A repository of links to current scientific research and findings into the nature of and relating to side-effects for Finasteride/Dutasteride/5a-reductase inhibitors.

in Finasteride 17 upvotes 5 years ago

Finasteride and dutasteride, used for hair loss, can cause sexual dysfunction, depression, and suicidal thoughts, with some effects persisting after stopping. The post stresses the importance of being aware of these risks.

community Massive study on finasteride side effects released

in Finasteride/Dutasteride 83 upvotes 1 year ago

The release of a study on 5a-reductase inhibitors (finasteride and dutasteride) which showed an increased risk of depression, dementia, decreased libido, and reduced semen load as potential side effects; discussion around other forms of hair loss treatments such as topical minoxidil, RU58841, or opting to accept baldness; and advice to consider professional help for deeper issues related to hair loss.

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