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CarcinogenesisAsk your pharmacist or doctor for a copy of the manufacturer's information for the patient.

indigestion pfizer viagra History The usual recommended dose of Viagra is 50 mg administered as needed approximately one hour prior to sexual activity. However, according to the prescribing information, Viagra may be taken anywhere within a range from 30 minutes to four hours prior to sexual activity. The dose of Viagra may be increased to 100 mg or decreased to 25 mg based on therapeutic response and tolerability. The maximum recommended dose is 100 mg with a maximum recommended frequency of administration of once daily. Viagra begins to exert its therapeutic effect within one hour with the duration of effects lasting for up to four hours. Erections do not last for four hours, however, a man has the ability to have an erection for up to four hours.Nervous systemThe major advantage of these medications for sexual enhancement is that they do not cause an erection at inappropriate times, because they act only in response to sexual stimulation. If there is no sexual stimulation drug remains in the background. All three are taken orally prior to planned sexual activity, acting to increase blood flow in the penis in response to sexual stimulation. However, there are important differences between the three, differences that could influence safety, specificity, duration of action, adverse effects, and ultimately, public acceptance within this class.

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sudden vision loss in one or both eyes. Sudden vision loss in one or both eyes can be a sign of a serious eye problem called non-arteritic anterior ischemic optic neuropathy (NAION). Stop taking Viagra and call your healthcare provider right away if you have sudden vision loss in one or both eyes.

mesylate), Minipress (prazosin HCl), Uroxatral (alfuzosin HCl), side effects from cialis The most common side effects of VIAGRA: headache; flushing; upset stomach; abnormal vision, such as changes in color visionIndigestion, acid reflux Ask your pharmacist to recommend a suitable indigestion remedy

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