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Viagra comes as a tablet containing sildenafil citrate, to take by mouth. For most men, the recommended dose is 50 mg. taken, as needed, approximately 1 hour before sexual activity. However, sildenafil citrate may be taken anywhere from 4 hours to 0.5 hour before sexual activity. Based on effectiveness and toleration, the dose may be increased to a maximum recommended dose of 100 mg or decreased to 25 mg. The maximum recommended dosing frequency is once per day.

Is viagra an over the counter medication. However, you should be aware: Viagra is intended for use to treat erectile dysfunction (orgasm) Viagra can be taken orally but should NOT be mixed with any other oral medication or food products. You should not take more than three days of combined treatment for erectile dysfunction with Viagra. Some side effects of Viagra will not seem to cause the same side effects if taken within the same dosage of tablet. If you experience side effects, check with your doctor or pharmacist immediately. Common Side Effects Common side effects of Viagra include: Nausea Headache Increased appetite Back pain Vomiting and diarrhoea. How is Viagra Best taken ? Viagra is a medication that can usually be taken orally. In some people, Viagra can be taken by mouth as an injection. Viagra is only used by people who have erectile dysfunction. Even if you have erectile dysfunction, do not usually need Viagra or any other medicine to help with sexual functioning. Viagra works by improving your blood flow. This improves supply, increasing blood flow to your penis, thereby allowing more stimulation and less resistance. How fast does Viagra take effect ? How fast you start getting erections is very important. If you wait a lot of time to start taking Viagra, it could take a long time or even not happen at all. Take Viagra as soon you feel erections – as fast possible. Do not wait till you get up in the morning or even try to get up do a normal night's sleep (if possible), if you are Viagra