Erectile dysfunction occurs when a man is unable to achieve or maintain an erection long enough for sexual relations. Once treated mainly as a psychological disorder, erectile dysfunction is now recognized to have several physiological causes, including a decrease in blood flow to the penis and nerve damage due to illness or injury.

Viagra and Cialis are two popular prescription medications which treat erectile dysfunction by increasing blood flow to the penis. Some men, however, are still uncomfortable about asking their doctors for a prescription. There are several popular OTC remedies available, but they vary in safety and effectiveness.

One remedy is red ginseng, a root used in Chinese medicine. Red ginseng has the same general effect as Viagra