Finasteride Results at 1 Year

Finasteride Results at 1 Year: What to Expect

Medically reviewed by [Reviewer Name, MD] | Last reviewed: August 2026 | Editorial policy

The 12-month mark is the primary endpoint used in finasteride’s pivotal clinical trials. By 1 year, men should have a clear picture of whether they are responding. Here is what the clinical evidence shows.

1-Year Clinical Trial Data (Kaufman 1998)

Outcome at 12 months	Finasteride 1 mg	Placebo
Hair count change (vertex)	+7.1 hairs/cm²	−10.6 hairs/cm²
Investigators rated: improved	48%	7%
Investigators rated: no further loss	83%	28%
Patient self-assessment: improved	66%	28%

The 17.7 hairs/cm² net advantage over placebo at 12 months is the benchmark figure from the pivotal trial. In absolute terms, this is visible improvement for most responders but not a dramatic transformation — finasteride’s primary benefit is maintaining existing hair and slowing progression.

What Does “Response” Mean at 1 Year?

Good response: No further visible hair loss + some regrowth; hair density stable or increased on standardized photography
Partial response: Continued hair loss but at a slower rate than expected without treatment; some stabilization in specific zones
Non-response: Continued hair loss at the same rate as untreated AGA; approximately 17% of men in the 1998 pivotal trial were rated as showing visible worsening by investigators at 12 months

What If You Don’t See Results at 1 Year?

Approximately 17% of men do not respond meaningfully at 12 months. If hair loss has continued at the same rate on finasteride 1 mg through month 12, discuss with your dermatologist. Options commonly considered include: switching to or adding minoxidil, discussing dutasteride (off-label), or low-level laser therapy as an adjunct. See: Finasteride alternatives.