Option 1: Topical minoxidil (standard starting point)

• Product: 5% solution or foam. Katzung's Basic and Clinical Pharmacology recommends 5% for men because it works better than 2%.
• Dose: 1 mL of solution, or half a capful of foam, applied to the dry scalp twice a day. Put it on the thinning areas, not on the hair itself.
• Don't use more than that. More product doesn't give more growth. It only raises the risk of irritation and absorption into the body.
• Vertex response: Vertex (crown) thinning responds better than frontal thinning (Katzung's).

Option 2: Low-dose oral minoxidil

• Typical range: Goldman-Cecil Medicine describes 0.25 to 2.5 mg/day as effective and usually well tolerated.
• Trial dose: One RCT in men, published in JAMA Dermatology, used a fixed 5 mg once daily for 24 weeks. It did not beat topical 5% twice daily, so the two worked about equally well (Penha et al., 2024).
• Practical start: Many dermatologists begin at 1.25 to 2.5 mg/day and raise the dose slowly if needed. This is common practice and I haven't checked it against a guideline.
• Another trial: A 2026 RCT found low-dose oral and topical minoxidil gave similar clinician-rated improvement at 24 weeks (67% oral, 73% topical). Hypertrichosis (unwanted hair growth elsewhere on the body) was more common with oral (30% vs 9%). Contact dermatitis occurred only with topical (11%) (Chaudhry 2026).
• Prescription needed: Oral minoxidil is used off-label for hair loss, so it needs a prescription and some blood pressure monitoring.

How long until you see results

Points to know

• It only works while you use it. If you stop, hair loss resumes within about 4 to 6 months (Katzung's). Goldman-Cecil describes a sudden shedding episode 3 to 4 months after stopping, which finasteride doesn't prevent.
• Combination therapy: Finasteride 1 mg/day plus minoxidil is commonly paired because the two work differently. Finasteride can cause sexual side effects and, rarely, persistent post-finasteride symptoms. Discuss the trade-off with your doctor.
• Side effects:
  • Topical: scalp irritation and dermatitis.
  • Oral: hypertrichosis, ankle swelling, a faster heart rate, dizziness and low blood pressure.
• Who shouldn't use oral minoxidil without cardiology input: People with heart disease, pericardial effusion or low blood pressure. Topical absorption is usually minimal, but caution applies to cardiac patients too (Katzung's).
• Confirm the diagnosis first. At 25, a dermatologist should confirm that this is male-pattern hair loss and not alopecia areata, telogen effluvium or another cause. Minoxidil is not a treatment for those.
• Track your progress: Take standardized photos in the same light and at the same angle at baseline, then every 3 months.

Recent evidence check