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Finasteride (Generic Propecia/Proscar): Complete 2026 Guide to Hair Loss and BPH Treatment
Quick answer: Finasteride is the generic version of Propecia (1mg, hair loss) and Proscar (5mg, BPH), originally developed by Merck. FDA-approved in 1992 for BPH and 1997 for male pattern baldness, it works by blocking the enzyme that converts testosterone to DHT. In 2026, generic finasteride costs $5–$10 per month at Cost Plus Drugs and $15–$25 per month via telehealth. The FDA label documents a 2–4% sexual side effect rate, and the drug is strictly contraindicated for handling by pregnant women due to the risk of male fetus birth defects.
What Is Finasteride?
Finasteride is a 5-alpha-reductase inhibitor first FDA-approved on June 19, 1992, as Proscar (5mg) for benign prostatic hyperplasia (BPH), then again on December 22, 1997, as Propecia (1mg) for androgenetic alopecia (male pattern baldness). Both formulations contain the same active ingredient at different doses. Merck developed and originally marketed both brands; generic finasteride is now widely available and is the dominant prescription used by online hair-loss telehealth platforms.
Finasteride is the most studied oral hair-loss medication in history, with more than two decades of long-term safety and efficacy data. It is used together with topical minoxidil in many telehealth protocols and is the foundation of the “Big 3” hair-loss regimen recommended by dermatologists.
How Finasteride Works
Finasteride selectively inhibits type II 5-alpha-reductase, the enzyme responsible for converting testosterone into dihydrotestosterone (DHT). DHT is the androgen primarily responsible for miniaturizing hair follicles in genetically susceptible men, leading to the receding hairline and crown thinning characteristic of male pattern baldness. By reducing scalp DHT by approximately 60–70%, finasteride halts further follicular miniaturization and, in many men, allows partial regrowth over 6–12 months of consistent use.
For BPH, the same DHT reduction shrinks the prostate over 6–12 months, improving urinary flow and reducing the long-term risk of acute urinary retention and prostate surgery.
Dosing
- 1mg daily — FDA-approved dose for male pattern baldness (Propecia)
- 5mg daily — FDA-approved dose for BPH (Proscar)
- Off-label “quartering” — some telehealth providers prescribe 1.25mg (a quartered 5mg tablet) daily for hair loss to lower cost; clinical evidence suggests equivalent efficacy
Finasteride takes 3–6 months for visible hair-loss benefits to appear, with peak results at 12–24 months. Discontinuation reverses benefits within 6–12 months as DHT levels normalize.
Cost of Finasteride in 2026
- Cost Plus Drugs: $5–$10 per month for generic finasteride 1mg or 5mg
- Telehealth platforms (Hims, Keeps, Ro): $15–$25 per month including provider consultation and shipping
- Branded Propecia: $70–$110 per month at retail pharmacies (rarely necessary given bioequivalent generics)
For a head-to-head comparison of the two largest hair-loss telehealth services, see our Keeps vs. Hims comparison.
Safety, Side Effects, and YMYL Warnings
Sexual side effects
According to the FDA label for Propecia, sexual side effects occur in 2–4% of men taking finasteride 1mg daily. These include decreased libido, erectile dysfunction, and ejaculatory disorders. In Merck’s pivotal clinical trials, sexual side effects resolved in most men after discontinuation. A smaller subset of men report persistent sexual dysfunction after stopping the drug — a controversial syndrome sometimes called “post-finasteride syndrome.” The FDA added language regarding persistent symptoms to the label in 2012.
Pregnancy contraindication (CRITICAL)
Finasteride is strictly contraindicated for use by women who are or may become pregnant. Female household members must not handle crushed or broken finasteride tablets, as the drug can be absorbed through the skin and cause severe birth defects in a male fetus (specifically, abnormal development of external genitalia). Whole, uncoated tablets are considered safe to handle if intact, but any broken or crushed tablet must be avoided by pregnant women or women of childbearing potential.
Other risks
Finasteride may increase the risk of high-grade prostate cancer in older men taking the 5mg dose, per the FDA’s Reduction by Dutasteride of Prostate Cancer Events (REDUCE) and Prostate Cancer Prevention Trial (PCPT) findings — though overall prostate cancer incidence decreases. Mood changes, including depression and suicidal ideation, have been reported in post-marketing surveillance; men with a history of depression should discuss this with their prescriber.
Lab interference
Finasteride lowers PSA (prostate-specific antigen) levels by approximately 50%. Men over 40 taking finasteride should inform their primary care doctor and urologist so PSA results can be interpreted correctly (typically by doubling the result).
Finasteride in Telehealth Protocols
Most modern hair-loss telehealth services prescribe finasteride as the cornerstone of their protocols. Hims, Keeps, and Ro all offer finasteride monotherapy or combined with topical minoxidil. Some platforms also offer topical finasteride, which delivers the drug directly to the scalp with lower systemic absorption and a theoretically reduced (though not eliminated) risk of sexual side effects. Topical formulations are off-label and not FDA-approved as of 2026.
Frequently Asked Questions
How long does finasteride take to regrow hair?
Most men see hair-loss stabilization within 3–6 months and visible regrowth between 6 and 12 months of consistent daily use. Peak benefit is typically reached at 12–24 months.
What happens if I stop taking finasteride?
DHT levels return to baseline within weeks, and the hair gained or preserved on finasteride will gradually be lost over the following 6–12 months as the underlying genetic balding process resumes.
What is the sexual side effect rate of finasteride?
Per the FDA label for Propecia 1mg, sexual side effects (decreased libido, ED, ejaculatory disorders) occur in 2–4% of men. In clinical trials these typically resolved after discontinuation, though persistent symptoms have been reported in post-marketing surveillance.
Is finasteride safe for women?
Finasteride is contraindicated in women who are or may become pregnant. Pregnant women must not handle crushed or broken tablets due to the risk of male fetus birth defects. Some dermatologists prescribe finasteride off-label to postmenopausal women for female pattern hair loss, but this is not FDA-approved.
Can I take finasteride and minoxidil together?
Yes — combining oral finasteride with topical minoxidil is the most studied and effective non-surgical hair-loss regimen. The two drugs work via independent mechanisms (DHT reduction vs. follicular blood flow) and are routinely co-prescribed by dermatologists and telehealth providers.
Bottom Line
Finasteride remains the most evidence-backed oral treatment for male pattern baldness in 2026, with three decades of safety and efficacy data and a cost as low as $5–$10 per month at Cost Plus Drugs or $15–$25 per month via telehealth. The 2–4% sexual side effect rate and the absolute contraindication for handling by pregnant women are essential considerations before starting therapy. For most men with early to moderate hair loss, finasteride paired with topical minoxidil offers the best balance of efficacy, safety, and cost.
Explore more in our hair-loss treatment hub.