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Patient Should Strictly Avoid Drugs Like Aldomet (Alpha Methyldopa), Labetalol, Isoproterenol, Isoetharine, Alpha-One Blockers, Aminophylline, Amphetamines, Ampicillin, Beta-Blockers, Ephedrine, Imipramine, Nicotine, Phenacetin, Theophylline, Phenothiazine, Vasodilators (Minoxidil, Nitrates & Hydralazine), Aspirin, Pas, Alpha-2 Agonists, Bromocriptine, Calcium Channel Blockers (Long Term Use), L-Dopa, Cimetidine, Clofibrate, Mao Inhibitors, Propranolol, Penicillin, Reserpine, Thyroxine, Vigorous Exercise, Severe Stress and Cigarette Smoking at Least 72 Hrs Before and During Specimen Collection