Hypersensitivity to diltiazem hydrochloride or to any of the excipients of Cardil CR. Sick sinus syndrome or evidence of 2nd- or 3rd-degree AV block except in the presence of a functioning pacemaker. Hypotension. Severe bradycardia (<40 bpm). Wolff-Parkinson-White syndrome. Decompensated cardiac insufficiency. Cardiogenic shock. Digitalis intoxication. Left ventricular failure with pulmonary congestion. Concomitant use of dantrolene infusion.
Use in Lactation: Diltiazem is excreted in breastmilk. Women should not breastfeed while on diltiazem treatment. If use of diltiazem is considered medically essential, breastfeeding should be terminated.