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Levitra (vardenafil) is similar to Viagra (sildenafil), in that it lasts about five hours; Viagra (sildenafil) lasts about four hours. Viagra begins to exert its therapeutic effect within one hour with the duration of effects lasting for up to four hours.

A glass of wine or a single beer is usually fine, but could still have some effect. VIAGRA connect can be taken with or without food. The most common side effects of Viagra include headache, facial flushing, and upset stomach. Population pharmacokinetic data from patients in clinical trials also indicated a reduction in sildenafil clearance when it was co-administered with CYP3A4 inhibitors (such as ketoconazole, erythromycin, or cimetidine) [see DOSAGE AND ADMINISTRATION and DRUG INTERACTIONS].

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The patent on Viagra is supposed to expire in March 2012 in the United States according to the United States Patent and Trademark Office. There have been some patients that have built a tolerance to this medication and have found that even though they were able to get an erection before utilizing it, they no longer are able to do so without the assistance of the ED medication. Study 1: VIAGRA with Doxazosin In the first study, a single oral dose of VIAGRA 100 mg or matching placebo was administered in a 2-period crossover design to 4 generally healthy males with benign prostatic hyperplasia (BPH).

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The most common reactions that men experience include headaches, indigestion, diarrhea, flushed skin, and dizziness. A decrease in testosterone production has also been identified as the cause in some men with diabetes.

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Most other foods and fruits use a different pathway, and they are alright to consume with Viagra. Priapism may lead to permanent damage if left untreated, including the permanent loss of ability to have an erection. Serious side effects Call your doctor right away if you have serious side effects. 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. Similar to Levitra, the recommended starting dose for Cialis, as needed, is 10 mg. If the medication is losing its effectiveness for you, you may want to consult your doctor for an alternative. Ocular: diplopia, temporary vision loss/decreased vision, ocular redness or bloodshot appearance, ocular burning, ocular swelling/pressure, increased intraocular pressure, retinal edema, retinal vascular disease or bleeding, and vitreous traction/detachment. One of the possible effects Viagra can have is to lower blood pressure. A second study discussed in the review found that both pre- and postmenopausal women reported no significant positive responses when using Viagra.