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Is the patient suffering from erectile dysfunction or from loss of libido or a disorder of ejaculation? Because as many as 25 percent of cases of erectile dysfunction are due to medication side effects,4 the patient's drug therapy should be reviewed. Common pharmacologic causes of this disorder include antihypertensive drugs, most notably the centrally acting agents, beta blockers and diuretics. Antipsychotic and antidepressant drugs are also frequently implicated. Other drugs that can cause erectile dysfunction include spironolactone (Aldactone), cimetidine (Tagamet) and finasteride (Proscar).5,7 Excessive alcohol intake, heroin use and cigarette smoking are also known causes (Table 2).4,7,8 *Monoamine oxidase inhibitors searching for cheap viagra? real viagra online without prescription