Finasteride vs dutasteride: Which one is FDA-approved for hair loss?

FDA approval applies to a specific drug product and use. Oral finasteride at the approved hair loss dose is FDA-approved for male pattern hair loss in men. Finasteride is also used at a different dose for an enlarged prostate. These uses and doses should not be treated as interchangeable.

Dutasteride is FDA-approved to treat an enlarged prostate. Prescribing it for hair loss is off-label. This means a physician uses an approved drug for a purpose that the FDA has not approved. Off-label prescribing does not remove the need to weigh risks, review evidence, and discuss other choices.

The product matters as well as the ingredient. Compounded medications are prepared by a licensed pharmacy for one patient and are not FDA-approved. The FDA does not review each compounded product for safety, effectiveness, or quality before it is sold.

A licensed physician in your state decides whether treatment is appropriate. Ask which product is being prescribed, whether its use is off-label, and whether it is compounded. You should understand these points before starting treatment.