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D. It is necessary to have a prescription in order to get Viagra and men should se their doctors in any case to discuss their erectile dysfunction problem. This will allow a physician to determine if men are healthy enough for sexual activity and what dose of Viagra to prescribe. Viagra tablets come in doses of 25-mg, 50-mg, and 100-mg. Elderly men with kidney or liver problems are often started out at the lower dose. Only the doctor should decide whether the dose needs to be increased. Men who take Viagra have generally found that there are few side effects and that they are mild. These may include headaches, nausea, and facial flushing that come and go fairly quickly. viagra sales statistics viagra reverse generic cialis lowest geneic cheapest cialis
