Finasteride 1 mg for Hair Loss: Dosage, Cost, and What to Expect
Medically reviewed by [Reviewer Name, MD] | Last reviewed: August 2026 | Editorial policy | Dosage hub
Finasteride 1 mg is the FDA-approved dose for the treatment of male androgenetic alopecia (AGA — male pattern hair loss). Sold under the brand name Propecia (Merck) and widely available as generic finasteride 1 mg, it is taken as one 1 mg tablet once daily. The drug received FDA approval for AGA in December 1997 based on two pivotal 12-month, double-blind, placebo-controlled trials (Kaufman et al., 1998) plus a 5-year long-term extension study.
Key Dosage Facts
| Parameter | Details |
|---|---|
| Approved dose | 1 mg orally once daily |
| Administration | With or without food |
| Indication | Male androgenetic alopecia (not approved for women) |
| Minimum duration before response assessment | 12 months of continuous daily use |
| Duration of treatment | Indefinite (benefit reverses within 6–12 months of stopping) |
| Brand name | Propecia (Merck) |
| Generic availability | Yes — widely available; therapeutically equivalent |
| Approximate monthly cost (generic) | $15–$35 (varies by pharmacy and insurance) |
| Approximate monthly cost (brand Propecia) | $70–$120 |
Generic Finasteride vs. Propecia: Is Generic Equivalent?
Yes. Generic finasteride 1 mg has the same active ingredient, dose, and bioavailability as brand-name Propecia. The FDA requires generic manufacturers to demonstrate bioequivalence to the reference drug. For most men, switching from Propecia to generic finasteride produces no change in clinical effect. Saving $50–$100/month using generic is clinically well-supported.
What to Expect After Starting 1 mg
- Months 1–3: No visible improvement; possible initial shedding; DHT suppression established by day 7
- Months 3–6: Hair loss rate slows or stops in most responders
- Months 6–12: Visible improvement in density and hair caliber for approximately 48–66% of men (by investigator assessment)
- Months 12–24: Peak response; continued gradual improvement in some men
- Long-term: Maintained benefit with continuous use; documented over 10 years (Rossi et al., 2011)
See the full finasteride results timeline.
Monitoring
- Standardized photographs at baseline and 12 months — the most practical way to document progress
- PSA baseline recommended before starting finasteride so future PSA values can be properly interpreted (finasteride reduces PSA ~50%)
- No routine blood tests are required during finasteride 1 mg treatment in otherwise healthy men
Related: Finasteride 5 mg for BPH | Dosage hub | Results timeline
Sources
- Kaufman KD, et al. “Finasteride in the treatment of men with androgenetic alopecia.” J Am Acad Dermatol. 1998;39(4):578–589.
- Merck & Co. Propecia (finasteride 1 mg) US Prescribing Information. Revised 2022.