Wow. Did you know that Viagra(Sildenafil) is metabolised by liver and excreted by both the liver and kidneys. If you take it with a high-fat meal, absorption is reduced; the time taken to reach the maximum concentration increases by around one hour, and the maximum concentration itself is decreased by nearly one-third. SO..
DO NOT EAT FAT MEALS, when you take VIAGRA.
With LEVITRA no such bugs