Be wary of 'herbal viagra'

Many products that are sold without a prescription claim to be herbal forms of Viagra. Some of these products contain various amounts of ingredients like those in prescription medicines. Such ingredients can cause dangerous side effects. Some products have the real medicine in them, and the medicine should be given by prescription only. In the United States, the Food and Drug Administration has banned many of these products. But some risky erectile dysfunction remedies are still on the market.