A quick look at 'herbal Viagra'

NBA star Lamar Odom took over-the-counter sexual performance enhancement drugs before he was found unconscious at a Nevada brothel, authorities say. The Food and Drug Administration, Mayo Clinic and others have warned against taking the supplements, sometimes called "herbal Viagra". Here is a look at these products:

What are they and how are they different from Viagra?

Viagra is a prescription medication approved by the FDA and used to treat erectile dysfunction. Herbal Viagra and other over-the-counter sexual performance enhancement products often are marketed as a cheaper alternative to Viagra but are not regulated by the FDA and can be purchased without a prescription. Many are sold online.