A Model for the Turnover of Dihydrotestosterone in the Presence of the Irreversible 5α-Reductase Inhibitors GI198745 and Finasteride

FCE 28260 (PNU 156765), an under-explored 5α-reductase inhibitor, showcases promising results in research by Giudici et al., outperforming well-known treatments like Finasteride in reducing the conversion of testosterone to DHT. Its superior efficacy, demonstrated through lower IC50 values in both natural and human recombinant enzyme studies, suggests it could offer more effective management of DHT-related conditions. Additionally, its lower molecular weight hints at better potential for topical application, potentially offering advantages in treating conditions such as androgenic alopecia. Despite its potential, it has not advanced in development, possibly due to financial limitations, leaving its therapeutic prospects and side effect profile largely unexplored.

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

Finasteride is the most effective treatment for reducing DHT and addressing hair loss compared to fish oil and saw palmetto. Topical treatments like RU58841 and minoxidil are also discussed, but finasteride remains the most effective option.

The conversation discusses the use of 5-alpha-reductase inhibitors like finasteride and dutasteride for hair loss in transgender women, particularly in relation to testosterone suppression. The original poster has been using dutasteride and is considering stopping it due to undetectable testosterone levels.

Despite using 5% minoxidil, 0.1% finasteride, and other treatments like microneedling, MK-677, and Cialis, hair loss continues with high testosterone and DHT levels. Considering oral dutasteride but concerned about further increasing testosterone levels.

Topical androgen receptor antagonists may not be necessary if 5-AR inhibitors like finasteride or dutasteride effectively reduce DHT levels. Combining a 5-AR inhibitor with a topical androgen antagonist could potentially enhance treatment, but oral use of androgen antagonists is too risky due to severe side effects.