The best reason I can think of to avoid giving any prescription drug, including Viagra, to someone else is the danger that it will conflict with other medication the person is taking or a pre-existing condition -- which could make the prescription drug dangerous or even fatal. I have never taken Viagra and, thank goodness, don't need to -- but if I did need it, I would not hesitate to see my doctor first. I would also use a reputable pharmacy which checks prescriptions against anything else prescribed for the patient. I had a situation once where one doctor prescribed a medication and another doctor prescribed another medication and it was the druggist who refused to fill the later prescription because of a potentially dangerous interaction.
Jack
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