How Long Should You Take Finasteride?
Medically reviewed by [Reviewer Name, MD] | Last reviewed: August 2026 | Editorial policy
Bottom line: Finasteride must be taken continuously to maintain its effect. Most men need to use it indefinitely to preserve hair — stopping typically results in loss of gained hair within 6–12 months and return to the original pattern of loss within 1–2 years.
What the Long-Term Data Show
| Timepoint | Outcome (continued use) | Outcome (stopped use) |
|---|---|---|
| Year 1 | Modest hair count improvement or stabilization | Shedding begins within 3–6 months of stopping |
| Year 2 | Peak hair count improvement vs. baseline | Return toward pre-treatment pattern |
| Years 5–10 | Sustained stabilization vs. continued decline in placebo | Essentially equivalent to never-treated by year 2 |
| 10-year open-label data | 87% of men maintained or improved hair at 10 years | N/A — observational only |
Source: 10-year finasteride study data | 1998 Phase III trials
When Stopping May Be Appropriate
- Persistent side effects that do not resolve — discuss with your provider before stopping
- Planning for conception in the near term — discuss with your urologist regarding timing
- Decision that maintaining hair is no longer a priority
What Happens at Year 1 Without Results?
Most dermatologists advise waiting at least 12 months before assessing whether finasteride is working, as the hair growth cycle means visible results typically lag the underlying pharmacological effect. Some men take 18–24 months to see peak benefit. If you see no stabilization or improvement by 18 months, discuss alternative or adjunctive options with your provider.
See: Results timeline | Results at 1 year | Dosage guide | What happens when you stop