Possible Side Effects:

Propecia's side effects are primarily sexual, and relatively uncommon (they strike one or two men in a hundred). If any side effects develop or change in intensity, inform your doctor as soon as possible. Only your doctor can determine if it is safe for you to continue taking Propecia.
Side effects may include: Breast tenderness and enlargement, decreased amount of semen per ejaculation, decreased sex drive, impotence, itching, rash, swelling, testicular pain.

Possible Food & Drug Interactions:

No significant drug interactions have been reported.

If You Take too Much:

Although no specific information is available on Propecia overdose, any medication taken in excess can have serious consequences. If you suspect an overdose, seek medical attention immediately.