CYP2D6 enzyme inhibitors increase nebivolol levels & Reserpine or clonidine may produce excessive reduction of sympathetic activity.Digitalis glycosides increase the risk of bradycardi & Verapamil-or diltiazem-type calcium channel blockers may cause excessive reductions in heart rate, blood pressure, and cardiac contractility. Potassium sparing diuretics, potassium supplements or salt substitutes may lead to increases in serum potassium besides that, NSAID use may lead to increased risk of renal impairment and loss of antihypertensive effect.Dual inhibition of the renin-angiotensin system: Increased risk of renal impairment, hypotension, and hyperkalemia.