<prompt> Most common side effect of DH Ps calcium channe blockers is -HeadacheConstipationDiarrhoeaMuscle cramps  <response>: Ans. is a i.e., Headache o The most common side effects caused by the Ca channel antagonists, paicularly the dihydropyridines, are due to excessive vasodilator. Symptoms include dizziness, hypotension, headache, flushing, digital dysesthesia, and nausea. 