Viagra (Sildenafil Citrate)

How long does Viagra, Cialis and Levitra last?

Many men ask "How long do ED drugs work?" In most of men, Viagra and Levitra act for a about 4 hours, Cialis is active for 36 hours. Generally, Viagra and Levitra loose their effective after a couple of hours. There are many factors that may change the length of Viagra, Cialis and Levitra action.

Factors affecting how long do ED drugs act include:

• Being over 60-65 years of age
• Having severe liver diseases such as liver cirrhosis
• Application of certain medications (there are many drugs that can interact with PDE5 inhibitors and enhance or slow down their metabolism)
• Consumption of high-fat meal.

The time it takes for Viagra, and Levitra to start working also changed from person to person. In most cases all the medication begin working within 30 minutes after oral administration. However, for Cialis it make more than one hour to begin acting.

In one study the effects of Cialis were comparing in men taking real medication and those taking sugar pills. The studies investigates the % of successful sexual intercourse in those patients taking Cialis brand 10mg , 20 mg and placebo.

During 24 hours successful attempts were observed in:

• 67% taking Cialis 20mg
• 56% taking Cialis 10mg
• 42% taking placebo

At 36 hours successful intercourses were observed in:

• 62% taking Cialis 20mg
• 56% taking Cialis 10mg
• 33% taking placebo