I tried a 100mg viagra (sildenafil) and didn't get a very rigid erection can i take another 1 2 or whole pill to see if it helps?

Viagra (sildenafil): You shouldn't take another tablet for at least 24 hours. Next dose, try crushing or chewing the viagra (sildenafil) tablet. In some men, the tablet doesn't dissolve and is not absorbed well. Crushing or chewing the tablet before swallowing it may solve this problem. If not, you may want to get an appointment with a urologist.