<prompt> Verapamil is contraindicated inHypertensionComplete heart blockParoxysmal supraventricular tachycardiaAngina pectoris  <response>: Ans. b Complete heart block. Ref. KDT, Pharmacology, 4th ed., 530 VERAPAMIL can accentuate conduction defects, hence contraindicated in II and III degree AV blocks and precipitates congestive heart failure in patients with pre-existing disease. Cardiac arrest can occur in patients with sick sinus syndrome.CALCIUM CHANNEL ANTAGONISTSDrugIndicationContraindicationsCautionsFrequent or peculiar side EffectsDihydropyridines: Nifedipine XL Amlodipine Felodipine XL Isradipine NicardipineMild to moderate hypertensionHeart failure, 2nd or 3rd degree heart blockTachycardia, flushing, gastro- intestinal disturbances, hyperkalemia, edema,headache.Benzothiazepines:DeltiazemMild to moderate HypertensionHeart failure, 2nd or 3rd degree heart blockSame as amlodipine, except no tachycardia or edema, but can cause heart block, constipation, and liver dysfunction.Phenylalkylamine: VerapamilMild to moderate HypertensionHeart failure, 2nd or 3rd degree heart block.Nausea, Constipation and Bradycardia 