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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.

Viagra sales in ireland were up 7.7 percent. With the sale of 1.2 million units in the euro area first quarter, sales in Britain rose the first three months of 2009 as well,