Bicalutamide for Thinning Hair in Women: What to Know About This Off-Label Pill

Female pattern hair loss, a gradual widening of the part and thinning over the crown, often speeds up around menopause. When minoxidil and spironolactone aren’t enough, some dermatologists now prescribe bicalutamide. Here is what’s known.

What it is

Bicalutamide blocks the effects of androgens, hormones that can shrink hair follicles in people who are prone to pattern hair loss. Its FDA approval is for advanced prostate cancer.¹ Using it for hair loss is off-label.

The U.S. label goes further: it says bicalutamide has no indication for women and should not be used in women, partly because it can harm a pregnancy.¹ That doesn’t stop prescribers from using it off-label after menopause, but you should know the label’s position.

What the hair research shows

A 2023 review of treatments for pattern hair loss summarized the evidence:²

• In a retrospective study of 17 women given 50 mg daily or every other day for 24 weeks, 57% had significant regrowth, and 12.5% had mildly raised liver enzymes.²
• A retrospective review of 316 women found it was generally well tolerated.²
• Doses used for hair are usually lower than for cancer, from 12.5 to 50 mg several times a week.²

These are small studies that looked back at records, not randomized trials against placebo. The review describes bicalutamide as better tolerated than flutamide, an older medicine in the same class.²

The liver warning

The label reports cases of severe liver injury, including deaths, mostly within the first three to four months. In prostate cancer trials, about 1% stopped because of hepatitis or sharply raised liver enzymes.¹ The label calls for liver blood tests before starting, regularly for the first four months and periodically after that.¹ Allergic reactions, including swelling, have also been reported.¹

Cost

In the review, a month of bicalutamide 50 mg averaged about $126 at retail, compared with about $16 for spironolactone 25 mg.² Lower hair-loss doses may cost less.

Questions to ask

1. Why bicalutamide over minoxidil or spironolactone for me?
2. What dose, and how often?
3. What’s the liver testing schedule, and who will follow up?
4. How long before we judge whether it’s working?

Our guides to oral minoxidil, spironolactone, finasteride for women and why hair thins compare other options.

Try: “My dermatologist suggested bicalutamide. Can you explain why it’s off-label for women, and how we’ll monitor my liver?”

Hair, Everywhere includes a Hair Check and a monthly Hair Log. Use them to track photos of your part, lab dates and any side effects. See the book.