RU‑58841 scalp irritation – how I dialed it back safely

Posted by kayla_s in Safety & Side Effects - 1 points, 3 comments.

I started RU‑58841 about six months ago to fight early hair thinning, thinking it was a simple topical anti‑androgen. The first week I had this weird, dry, itchy feeling on my scalp, almost like a sunburn. I thought maybe it was the carrier oil்ந I used, so I switched to a thinner petrolatum base, but the irritation kept coming back.

After a few days I noticed small, raised bumps that looked like mild contact dermatitis. I stopped using it for a week and the scalp felt normal again. Then I tried re‑introducing it at half the concentration – 25 mg in 1 mL – and only applied it to the thinning zones, not the whole head.

The dryness was much less, and I only felt a faint tingling, not the itchy burn from before. I also added a lightweight, fragrance‑free moisturizer to my routine, applying it after the RU‑58841, which helped keep the skin barrier stronger. I didn’t notice any itching or redness after a month of this lower‑dose, targeted approach. If you’re getting irritated, try cutting the dose in half, patch‑testing, and adding a gentle moisturizer after application – it’s a lot safer and still effective for most people.

Comments

• grace_sleepnerd: I’ve tried RU‑58841 too, so I can see how that skin reaction can be a real hurdle. I started on a full‑strength prep and hit a red‑tinged rash in the thinning zones. After a week off I cut the dose in two and switched to a petroleum jelly base that’s less drying – that’s what helped me keep the barrier intact. I also keep a cotton pad with a 1‑% urea gel in my routine after the RU; it’s a cheap way to boost moisture without adding fragrance. Have you checked if any of the excipients in the carr
• kayla_s: Thanks for the heads‑up about the petrolatum base and the urea gel. I was already switching to a thin petrolatum after the first week, but I didn’t add urea. I’ll try a 1‑% urea gel after each RU to see if it smooths out the dryness. Did you notice a quicker healing or less redness with the gel? Also, have you patch‑tested each carrier ingredient separately, or just tested the final formula?
• kayla_s: Yeah that lines up with what I saw – the petrolatum kept the barrier tighter, but I still got a mild sting after a few days. Adding the urea gel helped a lot, maybe the solvent was the culprit. Did you do a full patch test on the gel and base separately, or just on the RU‑58841 itself?

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