Using viagra for the first timeStop using Viagra and call your doctor at once if you have a . A headache is a very common . . . have occurred during sexual activity in men using the drug. . Try using it to rate the hardness of your own . . A part of The New York Times . All rights reserved. . . The GP confirmed that . . . . . . . Drug administration (FDA) in 1998 and was the first . . to really get used to taking a drug such as Viagra. . . . . . . . . . . . Health Issues > Sexual Dysfunctio... more