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These concerns were the main reasons why the FDA recommended against approval after the first two reviews. All three of these medications inhibit an enzyme (PDE-5) that breaks down the substance produced by the penile tissue in response to sexual stimulation, and helps the erection occur. Sometimes, nitrates are also given on a daily basis, once or twice a day. Possible side effects associated with treatment with Viagra include flushed skin, nausea or abdominal pain, congestion in the nose, diarrhea, vision clouded with a blue tint, headache and digestive problems. Doses may range from 5 mg to 20 mg depending on efficacy and patient tolerability. The highest enzymatic activities were found in intestine wall, in pancreas, and in liver.

This is compared to a 19 percent positive response for those taking a placebo. Side Effects This page contains important information about Viagra side effects – both common and less common. Pediatric Use VIAGRA is not indicated for use in pediatric patients.

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Viagra should be taken exactly as directed by your doctor. A: Viagra (sildenafil) should not be used in patients also using a nitrate drug for chest pain or heart problems. Some medications can change how long the effects of Viagra last. Excessive alcohol consumption combined with Viagra may cause light-headedness, dizziness, headaches, heart palpitations or fainting.

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Gharbia, PharmD Q: What's the problem with taking Viagra occasionally two times in the same day, maybe 12 or so hours apart? Most medications can be cut in two if they are not extended release, but you should always check with your doctor or pharmacist, as the guideline is not always true. More common side effects The more common side effects of sildenafil can include: nosebleeds headaches upset stomach flushing (reddening and warming of the face) trouble sleeping fever an erection that lasts longer than normal respiratory infection nausea vomiting bronchitis sore throat runny nose If these effects are mild, they may go away within a few days or a couple of weeks. Lori Mendoza, PharmD Q: Are there different types of Viagra? Between injections, heart function was not altered in the sildenafil group, demonstrating the absence of adverse side effects on the resting human heart. “Knowing more about the effects of sildenafil on heart function will allow for  safer evaluation of its use as a treatment for heart problems,” says Kass.  “Until now, it was widely thought that drugs like sildenafil had no effects on the human heart and that its only purpose was vasodilation in the penis and the lungs. “Our results set the stage for further studies of sildenafil’s immediate and long-term effects on the heart and its ability to modify other neurohormonal and stress stimuli, including adrenaline and hypertension,” he adds.

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Furthermore, it was only possible that this side effect was related to treatment and a causal relationship to Viagra was uncertain. Urogenital: prolonged erection, priapism [see WARNINGS AND PRECAUTIONS and PATIENT INFORMATION], and hematuria. Female Viagra does the following: It increases blood testosterone levels. Drinking alcohol with this medicine can cause side effects. Increased side effects can include low blood pressure or erections that last longer than normal. Consult your physician or healthcare provider for specific recommendations on potential alternatives to Viagra treatment. Common Viagra Side Effects When consuming Viagra 50 mg, 100 or other dosages, you may notice one or more side effects.