Telehealth sites offer a long menu of prescription hair loss treatments, but the options aren't equally proven. Exactly one prescription medication is FDA-approved for pattern hair loss — oral finasteride, for men. Everything else a provider might prescribe is off-label or compounded. That doesn't make those options wrong, but it changes how much confidence the evidence supports.
Here's a clear-eyed guide to the prescription options, what each is approved for, and what the studies actually show.
First, a Note on the Non-Prescription Workhorse
Before the prescription list: topical minoxidil, the other FDA-approved hair loss medication, doesn't require a prescription at all. It's approved for both men and women and is the standard first treatment for female pattern hair loss. If you haven't tried it, it's often the logical — and cheapest — starting point, alone or alongside a prescription option.
1. Oral Finasteride — FDA-Approved (Men Only)
Status: The only prescription medication FDA-approved for androgenetic alopecia, indicated for men only.
How it works: A daily 1 mg tablet that blocks the enzyme converting testosterone to DHT — the hormone that miniaturizes genetically susceptible follicles.
The evidence: In trials, improvement appeared as early as three months, and five-year data showed continued advantage over placebo. Reviews report reduced loss in most men and some regrowth in about two-thirds.
What to weigh: A small percentage of men in trials reported decreased libido, erectile dysfunction, or ejaculation problems — usually reversible after stopping, though persistent cases have been reported. Women who are or may become pregnant must not take finasteride or handle crushed or broken tablets, because it can cause abnormalities in a male fetus.
2. Oral Minoxidil — Off-Label
Status: FDA-approved for severe high blood pressure; prescribed off-label at low doses for hair loss.
How it works: Stimulates follicles systemically, the same way the topical version works on the scalp.
The evidence: A 2024 randomized trial in men found 5 mg daily performed about as well as 5% topical minoxidil over 24 weeks, with good tolerability. It's a reasonable option for people who can't stand the topical routine.
What to weigh: Possible unwanted hair growth elsewhere on the body, fluid retention, and heart-rate effects — which is why it needs clinician supervision rather than self-dosing.
3. Topical Finasteride (Often Combined With Minoxidil) — Compounded, Not Approved
Status: Not FDA-approved in any topical form; sold as compounded sprays and solutions.
The evidence: Some studies suggest efficacy comparable to the oral tablet. But the FDA has alerted clinicians and consumers that topical finasteride is absorbed into the bloodstream and has been associated with the same side effects as the pill — so "topical" should not be read as "side-effect-free."
What to weigh: Compounded products also carry transfer risk: the FDA notes applied product can inadvertently expose others, including pregnant women.
4. Spironolactone — Off-Label (Women)
Status: A blood-pressure medication prescribed off-label for female pattern hair loss, particularly when androgen excess is suspected.
The evidence: Dermatology references report improvement in a meaningful minority of women — one study of 166 women found about 42% reported mild improvement and 31% increased thickness. Modest, but useful when minoxidil alone isn't enough.
What to weigh: It can raise potassium levels, so clinicians may monitor blood work, and it is not appropriate during pregnancy. It's not used for hair loss in men.
5. Dutasteride — Off-Label
Status: A stronger DHT-blocker approved for enlarged prostate, prescribed off-label for hair loss.
The evidence: Comparative studies suggest it's at least as effective as finasteride, possibly more. The trade-off is a similar side-effect profile with less long-term hair-loss-specific safety data, since it never went through FDA approval for this use.
The Timeline — and the Catch — for All of Them
- Months 1–2: Possible temporary shedding as follicles cycle into new growth
- Months 3–6: Earliest visible improvement in studies
- Months 6–12: The fair window for judging whether a medication works for you
The catch applies across the board: these are maintenance medications. Stop taking them and the benefit reverses — with finasteride, shedding typically resumes within weeks and regrown hair is lost within about a year. Budget for ongoing use, not a one-time fix.
Bottom Line
For men, oral finasteride has the strongest approval status and evidence, often paired with minoxidil. For women, topical minoxidil comes first, with spironolactone as an off-label addition some clinicians use. Off-label and compounded options can be legitimate tools, but they ride on thinner evidence — a distinction worth understanding before paying a premium for them. A licensed clinician should confirm the cause of your hair loss and help match you to the option that fits your health history.
Sources used for medical context
- FDA prescribing information for finasteride (Propecia) for approval status, trial results, side effects, and pregnancy warnings.
- NIH StatPearls: 5-Alpha-Reductase Inhibitors for finasteride and dutasteride evidence and discontinuation effects.
- JAMA Dermatology: oral vs topical minoxidil randomized trial for oral minoxidil's off-label evidence in men.
- American Academy of Dermatology: Hair loss diagnosis and treatment for spironolactone data and treatment timelines.
- FDA alert on compounded topical finasteride for systemic absorption and exposure-transfer risks.
