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There may be other drugs that can interact with finasteride. Tell your doctor about all your prescription and over-the-counter medications, vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start a new medication without telling your doctor.

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Call your doctor at once if you notice any breast lumps, pain, nipple discharge, or other breast changes. These may be signs of male breast cancer.

Less serious side effects may include:

• feeling like you might pass out;

• swelling in your hands or feet;

• pain in the testicles;

• impotence, loss of interest in sex, or trouble having an orgasm;

• abnormal ejaculation;

• swelling or tenderness in your breasts;

• dizziness, weakness;

• headache;

• runny nose; or

• skin rash.

This is not a complete list of side effects and others may occur. Tell your doctor about any unusual or bothersome side effect.