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Patient Should Strictly Avoid Alpha-One Blockers, Aminophylline, Amphetamines, Ampicillin, Beta-Blockers, Ephedrine, Imipramine, Methyldopa, Mao Inhibitors, Nicotine, Phenacetin, Phenothiazine, Theophylline, Vasodilators, Aspirin, Pas, Alpha-2 Agonists, Bromocriptine, Calcium Channel Blockers ( Long Term Use), Clofibrate, Propranolol, Penicillin, Reserpine, Thyroxine, Alpha-Methyldopa, Isoproterenol, Labetalol, Mandelamine, Paracetamol, Cimetidine, Metoclopramide, Vigorous Exercise, Alcoholic Beverages, Tea/Coffee and Tobacco at Least 72 Hours Before and During Specimen Collection, Collect Urine with Appropriate Volume of 50% Hcl, to Maintain PH Between 1-2 DO NOT Use Concentrated HCL Record 24 Hour Volume on Test Request form and Urine Container Ship Refrigerated or Frozen