Imidapril HCl: Lithium; K-sparing diuretics, supplements, or salt substitutes; NSAIDs, antihypertensive agents, anesth drugs, narcotics, antipsychotics, allopurinol, cytostatic or immunosuppressive agents, systemic corticosteroids, procainamide, rifampicin, antidiabetics, antacids, sympathomimetics, alcohol. Hydrochlorothiazide: Alcohol, barbiturates, narcotics, amantadine, aminoglycosides, anticholinergics, antidiabetics, cholestyramine & colestipol resins, ACTH, cytotoxic agents, pressor amines, non-depolarizing skeletal muscle relaxants, lithium, NSAIDs including COX-2 inhibitors, other antihypertensive drugs.