Finasteride vs Minoxidil: Hair Loss Treatments Compared

Male pattern hair loss (androgenetic alopecia) affects roughly 50% of Australian men by age 50. Only two medications have robust clinical evidence for treatment: finasteride (oral, prescription) and minoxidil (topical, over-the-counter). They work by completely different mechanisms, have different side-effect profiles, and can be used alone or together. This guide covers the evidence for both.

How Finasteride Works

Finasteride is a 5-alpha-reductase inhibitor. It blocks the enzyme that converts testosterone to dihydrotestosterone (DHT). DHT is the androgen primarily responsible for miniaturising hair follicles in genetically susceptible men. By reducing DHT levels by approximately 70%, finasteride slows follicle miniaturisation and, in many cases, allows partially miniaturised follicles to recover.

• Dose: 1mg daily (oral tablet)
• Onset: visible results typically 3-6 months; full effect at 12 months
• Efficacy: 83-90% of men maintain or increase hair count over 2 years (Kaufman 1998, Whiting 2003)
• Schedule: S4 (prescription only) in Australia
• PBS listed: No -- private prescription only for hair loss indication

How Minoxidil Works

Minoxidil is a vasodilator that was originally developed for high blood pressure. Its mechanism in hair growth is not fully understood, but it appears to prolong the anagen (growth) phase of the hair cycle and increase follicle size. It works independently of the androgen/DHT pathway, which is why it can complement finasteride.

• Dose: topical 5% solution or foam, applied twice daily (or once daily for foam formulations)
• Onset: visible results typically 3-4 months; full effect at 6-12 months
• Efficacy: ~40% of men show moderate to dense regrowth; ~60% show some improvement over placebo
• Schedule: S3 (pharmacist-only) in Australia -- no prescription needed, but pharmacist must supply
• Oral minoxidil (off-label, low-dose 2.5-5mg) is increasingly prescribed by dermatologists

Effectiveness: Head-to-Head

Direct comparison trials show finasteride is generally more effective than topical minoxidil for vertex (crown) hair loss. A 2004 study (Arca et al.) comparing finasteride 1mg to minoxidil 5% over 12 months found superior hair count improvements with finasteride. However, minoxidil may be more effective at the frontal hairline in some patients.

• Vertex (crown): finasteride generally superior
• Frontal hairline: both have modest efficacy; neither is strongly effective for advanced recession
• Maintenance (preventing further loss): finasteride superior -- it addresses the underlying hormonal cause
• Regrowth: both can regrow hair in partially miniaturised follicles; dead follicles cannot be recovered by either

Side Effects

Finasteride side effects

• Sexual side effects (decreased libido, erectile difficulty, reduced ejaculate volume): reported by 2-4% in clinical trials
• These resolve on discontinuation in the vast majority of cases
• Post-finasteride syndrome (persistent sexual side effects after stopping): reported anecdotally but not confirmed in controlled studies; the FDA added warnings based on post-marketing reports
• Breast tenderness/gynaecomastia: rare (<1%)
• Mood changes: rare, reported anecdotally

Minoxidil side effects (topical)

• Scalp irritation, dryness, or itching (most common, especially with the alcohol-based solution)
• Initial shedding in weeks 2-8 (a normal sign the treatment is working -- miniaturised hairs shed to make way for thicker ones)
• Unwanted facial hair growth if the solution drips onto the face
• Systemic side effects (dizziness, rapid heartbeat) are rare with topical application but more relevant with oral minoxidil
• The foam formulation causes less irritation than the solution

Combining Finasteride and Minoxidil

Because finasteride and minoxidil work by different mechanisms, combining them is a well-established approach. Studies show combination therapy is more effective than either treatment alone, particularly for men with moderate hair loss who want maximum regrowth potential. The combination addresses both the hormonal cause (DHT) and directly stimulates follicle growth.

Cost in Australia

• Finasteride 1mg (generic): approximately $20-$40 for 30 tablets (one month supply)
• Minoxidil 5% topical solution: approximately $25-$50 for a one-month supply (pharmacy brands)
• Minoxidil foam (e.g., Regaine): approximately $40-$70 for a one-month supply
• Neither is PBS-subsidised for hair loss -- both are private/full-price purchases

Important: Finasteride and Women

When to See a Dermatologist

• You are losing hair rapidly or in patches (may indicate alopecia areata, not androgenetic alopecia)
• You are female (female pattern hair loss has different treatment approaches)
• Standard treatments have been ineffective after 12 months
• You have scarring or inflammation on the scalp
• You want to discuss advanced options (low-dose oral minoxidil, dutasteride, hair transplant)

Getting Treatment in Australia

Minoxidil (topical) is available over-the-counter from any pharmacy (Schedule 3 -- pharmacist-only). Finasteride requires a prescription from an AHPRA-registered doctor. Telehealth consultations are appropriate for hair loss assessment and finasteride prescribing when the doctor can review your medical history and hair loss pattern. InstantMed offers a structured hair loss assessment pathway.