Androgenetic alopecia affects 30-50% of men before age 50. Good news: treated early, most preserve or recover density. Bad news: when the follicle is already dead (not just miniaturized), no medical treatment revives it — that's where transplant comes in. This guide covers what treatments work, at which stage, and why starting early changes the outcome.
How androgenetic alopecia works
Testosterone converts to DHT (dihydrotestosterone) via 5-alpha-reductase. DHT binds to the scalp follicle and, in genetically predisposed men, progressively miniaturizes it: hair becomes thinner, shorter, until the follicle stops producing visible hair. But the follicle doesn't die immediately — it goes through miniaturization where reversal is still possible.
This is the key therapeutic window. Treating during miniaturization: high recovery probability. Treating when follicle is fully atrophic: no medical recovery, only transplant.
Evidence-based medical treatments (by effectiveness)
Finasteride (1 mg/day oral): blocks 5-alpha-reductase, reduces scalp DHT. Effective in 80-90% to halt loss; 60-70% see some regrowth. Visible at 6 months, full at 12. Requires continuous use — on suspension, loss resumes 6-12 months.
Topical minoxidil (5%, 1 ml twice daily): vasodilator. Mechanism not fully clear, but stimulates miniaturizing follicles. Effective in 40-60%. Useful adjunct to finasteride.
Dutasteride (oral, off-label): blocks both 5-alpha-reductase types, more potent than finasteride. Reserved for non-responders to finasteride alone, under medical supervision.
PRP scalp injection: own-plasma growth factors injected into scalp. Moderate evidence. Useful as adjunct to pharmacology, not standalone.
Scalp mesotherapy: vitamins, peptides, topical injectable dutasteride. Useful as reinforcement, doesn't replace systemic treatment.
When medical treatment isn't enough
If hairline or crown shows bald skin without visible follicles (not just thin hair), the follicle is no longer miniaturizing — it's dead. No medication or PRP revives it. Options:
- Hair transplant (FUE): follicular units from donor zone (back and sides, DHT-resistant) extracted and implanted in affected area. Permanent in transplanted zone because donor follicles retain genetic DHT resistance.
- Continue medical treatment to preserve what remains: transplant doesn't stop alopecia in non-transplanted zones. Nearly all transplanted patients continue finasteride and minoxidil to preserve native hair.
Real finasteride side effects
Most-discussed topic. Real incidence of sexual side effects (decreased libido, erectile dysfunction) is 1-2% in controlled trials — lower than social media discussion but not nonexistent. Key:
- Discuss openly with doctor before starting.
- If they appear, suspend under supervision — mostly resolve in weeks-months.
- Topical alternatives exist (topical finasteride) with lower systemic absorption for concerned patients.
Post-finasteride syndrome (persistent effects after suspension) is controversial with limited evidence. Most patients tolerating finasteride well in the first 3 months continue tolerating indefinitely.
Typical Lima plan (2026)
For grade II-III androgenetic alopecia (hairline and crown miniaturizing):
- Initial consultation: free at Elyzea.
- Finasteride 1 mg/day (Rx + pharmacy ~S/30-60/month in Lima).
- Topical minoxidil 5% twice daily (~S/40/month).
- Monthly scalp PRP first 4 months, then every 3 months (S/300-500/session in Lima).
- Optional scalp mesotherapy as boost.
First-year cost: approximately S/3,500-5,000 by plan. Vs US equivalent ($200-400/month maintenance), savings are clear.
When to start (the window matters)
Just noticing thinner hair or receding hairline: start medical treatment now. Maximum-effectiveness window.
Years of loss but visible thin hair remains: starting still reasonable; many follicles miniaturizing can partially recover.
Affected zones are bald skin without fuzz: medical treatment preserves remaining hair in non-affected zones, but regrowth in bald zones requires transplant.
Earlier consultation = more options. Waiting until 'severe' reduces successful medical treatment chances.
Frequently asked questions
How long until finasteride shows results?
Loss stabilizes in 3-4 months. Visible regrowth at 6 months. Full result at 12. If no response after 12 months, reevaluate dose or add dutasteride.
Is finasteride 1 mg the same as 5 mg for prostate?
Same molecule, different dose. 1 mg is indicated for alopecia. 5 mg is for prostate but some patients split it — better to dose specifically at 1 mg.
Can I combine medical treatment with transplant?
Yes, and it's recommended. Transplant restores hair in bald zones; medical treatment (finasteride + minoxidil) preserves native non-transplanted hair. Without post-transplant medical treatment, alopecia continues progressing in non-operated zones.
Hair transplant in Lima vs abroad?
Lima has hair surgeons with FUE experience comparable to Turkey and US, at lower cost than US. Choice should be based on surgeon credentials, verifiable cases, and technique used (FUE vs FUT). Not just price.
Is hair loss only genetic?
Mostly yes in men with classic androgenetic pattern (hairline and crown). But other causes need ruling out: iron deficiency, hypothyroidism, severe chronic stress, alopecia areata. Medical consult differentiates.