What is Finasteride?

Finasteride is an oral medication that works by inhibiting the enzyme 5-alpha-reductase, which converts testosterone into dihydrotestosterone (DHT). By reducing DHT levels in the body, finasteride addresses one of the primary hormonal factors in certain types of hair loss.

Finasteride is available by prescription in most countries and is typically taken in a 1mg daily dose for hair-related concerns.

How Does Finasteride Work?

Finasteride works through a specific biochemical pathway:

• Inhibits 5-alpha-reductase — Blocks the enzyme that converts testosterone to DHT
• Reduces DHT levels — Can reduce scalp DHT levels by up to 70%
• Protects follicles — Lower DHT means less shrinkage of susceptible follicles
• May promote regrowth — Some follicles may recover and produce thicker hair

Expected Results and Timeline

Time Period	Expected Changes
Months 1-3	Typically no visible changes; medication is working internally
Months 3-6	Some users notice reduced shedding; early growth may appear
Months 6-12	More noticeable improvements in thickness and coverage
Year 1 and beyond	Maximum benefits; continued use maintains results

Important Side Effects to Know

Common Side Effects

• Decreased libido (sex drive)
• Erectile dysfunction
• Decreased semen volume
• Breast tenderness or enlargement

Important Considerations

• Effects on PSA levels — Finasteride can lower PSA (prostate-specific antigen) levels, which may affect prostate cancer screening
• Post-finasteride syndrome — Some users report persistent symptoms after discontinuation, though this is not well-studied
• Not for women — Finasteride should not be handled by pregnant women due to risk of birth defects
• Drug interactions — Inform your doctor about all medications you're taking

Who Should Consider Finasteride

Finasteride may be appropriate for men who:

• Are experiencing pattern hair loss (genetic pattern hair loss)
• Have confirmed elevated DHT levels or are diagnosed with androgenetic alopecia
• Are in the early to moderate stages of hair loss
• Can commit to long-term daily medication
• Have been evaluated by a healthcare provider

Contraindications and Cautions

• Women who are pregnant or may become pregnant — Should not handle crushed or broken tablets
• Children — Not approved for use in children
• Liver disease — Use with caution; may require dose adjustment
• Prostate cancer — May affect PSA testing; discuss with your doctor

Finasteride vs. Other Options

Finasteride works differently from topical treatments like minoxidil:

• Minoxidil — Works primarily by vasodilation and direct follicle stimulation; can be used by both men and women
• Finasteride — Works by reducing DHT levels; for men only; requires prescription
• Combined approach — Some individuals use both for potentially additive benefits