Concomitant use w/ anesth. Untreated CHF, ischemic heart disease. Peripheral circulatory disorders (Raynaud's disease or syndrome, intermittent claudication); 1st-degree heart block; Prinzmetal's angina. DM, hyperthyroidism, COPD, history of psoriasis. May increase sensitivity to allergens & severity of anaphylactic reactions. Avoid abrupt w/drawal. Severe renal impairment. Galactose intolerance, Lapp lactase deficiency or glucose-galactose malabsorption. May impair ability to drive or operate machinery. Pregnancy & lactation. Childn & adolescent. Elderly >75 yr.