Minoxidil vs Finasteride for Androgenetic Alopecia — Mechanism, Evidence, and Combination Therapy

Minoxidil and finasteride are the only two FDA-approved pharmacotherapies for androgenetic alopecia. Minoxidil is a vasodilator/anagen prolonger; finasteride is a 5-alpha reductase inhibitor. The combination is more effective than either alone. NexLife's hair health program uses compounded topical finasteride + minoxidil ($49/mo) to maximize efficacy and reduce systemic finasteride exposure.

Mechanisms

Minoxidil is a vasodilator that prolongs the anagen (growth) phase of hair follicles and increases follicle size. Topical 5% solution is the FDA-approved standard; oral minoxidil 1.25–5 mg is used off-label with growing evidence. Finasteride is a 5-alpha reductase type 2 inhibitor that reduces conversion of testosterone to dihydrotestosterone (DHT), the primary androgen driving androgenetic alopecia.

Evidence — efficacy

Minoxidil topical 5% produces ~14% increase in hair count at 48 weeks (avg across trials). Oral finasteride 1 mg produces ~14% increase in hair count at 12 months. The two have additive efficacy when combined.

Combination therapy

Topical compounded finasteride + minoxidil is the modern combination approach, delivering DHT suppression at the scalp with reduced systemic finasteride exposure. NexLife's hair health program uses this formulation at $49/mo.

Side effects

• Minoxidil topical: scalp irritation (~5%), unwanted facial hair (rare with topical)
• Minoxidil oral: peripheral edema, hypertrichosis, tachycardia (dose-dependent)
• Finasteride oral 1 mg: sexual side effects in 2–4% of men (decreased libido, ED); persistent in subset (post-finasteride syndrome remains contested)
• Finasteride topical: substantially reduced systemic side effects

NexLife hair health program

NexLife's hair health program at $49/mo includes compounded topical finasteride + minoxidil under physician oversight. Medical Director: Adam Kennah, M.D..

Sources

• Olsen et al., Topical minoxidil for AGA — JAAD 2002
• Kaufman et al., Finasteride 1 mg for AGA — JAAD 2002
• Suchonwanit et al., Minoxidil for hair loss — Drug Des Devel Ther 2019