Sildenafil is the generic form of Viagra. Generic medications are required by the FDA to be bioequivalent to the brand medication, meaning that they act the same way in the body and have the same active ingredients. Generic medications also tend to be less expensive than the brand medications and most medications sold in the U.S. are generic.
Most patients will start having a response from Sildenafil 20-30 minutes after taking their dose, although full effects may take longer. Eating a high-fat meal just before taking your dose may delay the time it takes for Sildenafil to work.
In most people, the effects of Sildenafil last about 2 hours. Even after the effects of the medication have worn off, the medication is still in your system for up to a day after dosing - so do not take more than one dose daily. If you find your dose lasting 4+ hours, seek medical attention as this is considered priapism and could have damaging effects on the tissues.
Before taking Sildenafil make sure your doctor knows about any of the following health conditions: Heart conditions, liver, kidney, eye conditions, bleeding disorders, or penile deformities. Also make sure your doctor knows about all of your current medications, supplements, and any other conditions.
Drinking alcohol with Sildenafil can cause side effects including low blood pressure or dizziness. Grapefruit may interact with Sildenafil and lead to unwanted side effects. Avoid the use of grapefruit products. Avoid using any other medicines to treat impotence, such as alprostadil or yohimbine, without first talking to your doctor.
The common side effects of Sildenafil are: flushing (warmth, redness, or tingly feeling), headache, dizziness, heartburn, nausea, or upset stomach, abnormal vision (blurred vision, changes in color vision), runny or stuffy nose, nosebleeds, sleep problems (insomnia), muscle pain, back pain. For a full list of possible side effects see the important safety information.
Taking too much Sildenafil can increase adverse side effects of the medication including severe side effects including extremely low blood pressure or having an erection for longer than 4 hours (priapism). If you have taken more than prescribed by your doctor, or you took the directed amount but you are still having these side effects, seek emergency medical attention.
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