Nebivolol: Effect on AV conduction time may be potentiated & -ve inotropic effect be increased w/ class I antiarrhythmics eg, quinidine, hydroquinidine, cibenzoline, flecainide, disopyramide, lidocaine, mexiletine, propafenone. -ve influence on contractility & AV conduction w/ Ca channel antagonists of verapamil/diltiazem type. May lead to profound hypotension & AV block w/ IV verapamil. May worsen heart failure w/ centrally-acting antihypertensives eg, clonidine, guanfacin, moxonidine, methyldopa, rilmenidine. Effect on AV conduction time may be potentiated w/ class III antiarrhythmic drugs eg, amiodarone. May attenuate reflex tachycardia & increase risk of hypotension w/ volatile halogenated anaesth. May mask certain symptoms of hypoglycaemia (eg, palpitations, tachycardia) w/ insulin & oral antidiabetic drugs. Increased fall in BP w/ baclofen & amifostine. May increase AV conduction time w/ digitalis glycosides. May increase risk of hypotension & of further deterioration of ventricular pump function w/ Ca antagonists of dihydropyridine type (eg, amlodipine, felodipine, lacidipine, nifedipine, nicardipine, nimodipine, nitrendipine) in patients w/ heart failure. Hypotensive effect may be enhanced w/ antipsychotics, antidepressants (eg, tricyclics, barbiturates & phenothiazines). Effect may be counteracted w/ sympathicomimetic agents. May lead to unopposed α-adrenergic activity of sympathicomimetic agents w/ both α- & β-adrenergic effects. Plasma levels may be increased w/ CYP2D6 inhibitors eg, paroxetine, fluoxetine, thioridazine & quinidine. Increased plasma levels w/ cimetidine. Increased plasma levels of & w/ nicardipine. Amlodipine: Plasma conc may be increased w/ grapefruit juice. Exposure may be increased w/ strong or moderate CYP3A4 inhibitors eg, PIs, azole antifungals, macrolides (eg, erythromycin or clarithromycin), verapamil or diltiazem. Plasma conc may vary w/ CYP3A4 inducers eg, rifampicin,
Hypericum perforatum. Risk of hyperkalemia w/ dantrolene infusion. Additive BP-lowering effects w/ other medicinal products w/ antihypertensive properties. Risk of increased tacrolimus blood levels. Increased exposure of simvastatin.