Lithium salts, NSAIDs. Losartan: Rifampin, fluconazole, K-sparing diuretics, K supplements or K-containing salt substitutes. Hydrochlorothiazide: Alcohol, barbiturates, narcotics, antidiabetic drugs (oral agents & insulin), other antihypertensives, cholestyramine, colestipol, corticosteroids, ACTH, pressor amines (eg, adrenaline), skeletal muscle relaxants, nondepolarizing (eg, tubocurarine).