How Long Does Viagra Last?

Many people wonder, "How long does Viagra last?" In most people, Viagra lasts for about four hours. Generally, it starts to lose its effectiveness after a couple of hours. There are a number of factors that can increase or decrease how long Viagra lasts. Some factors that increase the amount of time Viagra stays in the body include being over 65 years old, having severe kidney disease, and taking certain other medicines. Among the factors that can decrease how long Viagra lasts are taking it with a high-fat meal or certain other medicines, such as rifampin.

How Long Does Viagra Last?

Many people thinking of taking Viagra® (sildenafil citrate) wonder, "How long does Viagra last?" The answer is that it depends on a number of factors and will vary between individuals. However, in most people, Viagra will last for about four hours -- although it generally starts to lose its effectiveness after a couple of hours.
 
The time it takes for Viagra to start working will also vary based on the individual. In clinical studies, Viagra began to work in as little as 14 minutes. For most people, though, it began working within 30 minutes.
 

Factors Affecting How Long Viagra Lasts

There are a number of factors that can increase or decrease how long Viagra lasts. Some factors that increase the amount of time Viagra stays in the body include:
 
  • Being over 65 years old
  • Having severe kidney disease or liver disease
  • Taking certain other medicines (see Viagra Drug Interactions).
     
There are also factors that can decrease how long Viagra lasts. Some of these factors include:
 
  • Taking Viagra with a high-fat meal
  • Taking Viagra along with certain other medications, such as rifampin.
     
 
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