Cutting Proscar 5mg into Quarters for Hair Loss
Medically reviewed by [Reviewer Name, MD] | Last reviewed: August 2026 | Editorial policy
Bottom line: Splitting Proscar 5 mg finasteride into four ~1.25 mg pieces is a well-known cost-reduction strategy that is pharmacokinetically sound. The 1.25 mg dose produces DHT suppression essentially equivalent to 1 mg. However, splitting tablets introduces dosing variability, and this is an off-label use of Proscar. Discuss with your prescribing doctor — some are comfortable prescribing Proscar for this purpose, others prefer dedicated 1 mg Propecia/generic.
The Pharmacokinetic Case
Finasteride produces near-maximal DHT suppression at doses between 0.2 mg and 5 mg — the dose-response curve is relatively flat above 0.2 mg. A 1.25 mg dose produces DHT suppression statistically indistinguishable from 1 mg. This means splitting a 5 mg Proscar into quarters should deliver therapeutically equivalent benefit to the approved 1 mg dose.
Cost Comparison
| Option | Approx. cost (30-day supply, US 2026) |
|---|---|
| Generic finasteride 1 mg × 30 | $8–$20 (with GoodRx or Cost Plus Drugs) |
| Generic finasteride 5 mg × 30 (split into 4) | $10–$25 for 120 effective doses (4 months’ supply) |
| Brand Propecia 1 mg × 30 | $80–$130 |
Given that generic 1 mg is already very inexpensive (especially via GoodRx/Cost Plus), the cost benefit of splitting has narrowed considerably since generics became widely available. Discuss with your provider which option makes sense for your situation.
See: Finasteride cost guide | Without insurance pricing | Finasteride 5mg guide | Finasteride 1mg guide