RU 58841 (PSK-3841) is a specific androgen receptor antagonist developed to promote hair regrowth. It acts as an investigational drug targeted for androgenic alopecia, commonly known as male pattern baldness (MPB).
Chemical Applications
Beyond research in androgen receptor activity, 4-[3-(4-Hydroxybutyl)-4,4-dimethyl-2,5-dioxo-1-imidazolidinyl]-2-(trifluoromethyl)benzonitrile serves as an essential intermediate in pharmaceutical chemical synthesis.
Mechanism of Action vs. Finasteride
As a topical anti-androgen, RU58841 works differently than Finasteride:
Finasteride: Acts directly on 5α-reductase, inhibiting the conversion of testosterone into DHT and reducing overall systemic DHT levels.
RU58841: Competitively blocks the receptor contact between dihydrotestosterone (DHT) and hair follicles. It does not directly reduce DHT production in the body, but prevents DHT binding at the local follicle level.
First-Aid & Handling Instructions
Inhalation
If inhaled, immediately move the patient to an area with fresh air. Ensure comfortable breathing.
Skin Contact
Remove contaminated clothing. Thoroughly rinse affected skin area with soap and plenty of water. Seek medical attention if irritation or discomfort occurs.
Reported Side Effects & Observations
RU58841 is applied to the scalp and absorbed by hair follicles. Theoretically, topical agents may enter systemic circulation. While primate research demonstrated no systemic side effects under topical application, anecdotal user reports note potential symptoms including:
RU-58841 is an investigational topical androgen receptor antagonist primary studied for treating androgenetic alopecia (male pattern baldness) and serving as an intermediate in chemical synthesis.
2. How does RU-58841 differ from Finasteride?
Finasteride inhibits the 5α-reductase enzyme to lower systemic DHT production. RU-58841 blocks local DHT binding directly at hair follicle receptors without altering overall DHT levels in the body.
3. How should RU-58841 powder be stored?
It should be sealed in a dry environment and kept in a freezer at temperatures under -20°C to preserve stability.
4. What is the physical form and appearance of RU-58841?
RU-58841 is supplied as a white powder packaged in PE bags combined with protective aluminum bags.
5. What first-aid steps should be taken upon skin exposure?
Remove contaminated clothing immediately, wash the affected skin thoroughly with soap and water, and seek medical attention if discomfort persists.
6. Are systemic side effects common with RU-58841?
Topical studies in primates showed no systemic side effects. However, individual reports mention possible reactions such as localized skin irritation, headaches, or mild androgenic side effects.
