Ca antagonists of the verapamil type & to a lesser extent of the diltiazem type, centrally acting antihypertensives (clonidine, methyldopa, moxonidine, rilmenidine) is not recommended. Increase plasma conc of amlodipine w/ strong or moderate CYP3A4 inhibitors (PIs, azole antifungals, erythromycin& clarithromycin, verapamil or diltiazem). Monitor BP & dose regulation w/ strong CYP3A4 inducers (eg, rifampicin,
Hypericum perforatum). Increase simvastatin plasma level. May potentiate the effect on AV conduction time & -ve inotropic effect w/ class I antiarrhythmic drugs (eg, quinidine, disopyramide, lidocaine, phenytoin, flecainide, propafenone). May potentiate the effect on AV conduction time w/ class III antiarrhythmic drugs (eg, amiodarone). Increased risk of bradycardia & AV conduction time w/ parasympthomimetic drugs. Topical β-blocker containing preparations (eg, eye drops for glaucoma) may contribute systemic effects. Intensification of lowering blood sugar effect & may mask symptoms of hypoglycemia w/ insulin & oral antidiabetic drugs. Increased risk of hypotension w/ anesth agents. Increased AV conduction time or reduction of heart rate w/ cardiac glycosides (digitalis). May reduced hypotensive effect of bisoprolol w/ NSAIDS. Reduce effect of agents w/ sympathomimetic agents (eg, isoprenaline, dobutamine). May lead do to increase BP & unmask α-adrenoreceptor-mediated vasoconstrictor effects w/ sympathomimetics (norepinephrine, epinephrine). Increased risk of hypotension w/ blood pressure lowering potential (eg, TCAs, barbiturates, phenothiazines). Increased tacrolimus blood levels. Cyclosporine. May increase risk of bradycardia w/ mefloquine. Enhanced hypotensive effect w/ MAOIs (except MAO-B) but also risk for hypertensive crisis. Exacerbation of peripheral circulatory disturbances w/ ergotamine derivatives.