Most people who have taken too much of a<unk><unk>  blocker, especially diltiazem, get slow heart rate and low blood pressure (vasodilatory shock). This can progress to the heart stopping altogether. CCBs of the dihydropyridine group, as well as flunarizine, predominantly cause reflex tachycardia as a reaction to the low blood pressure. Other potential symptoms include: nausea and vomiting, a decreased level of consciousness, and breathing difficulties. Symptoms usually begin within 6 hours of taking the medication by mouth. With extended release formulations symptoms may not occur for up to a day. Seizures are rare in adults but in children occur more often. Hypocalcaemia may also occur.
Calcium channel blocker toxicity
Beta blocker
Organophosphate-induced delayed neuropathy
Electrolyte exclusion effect
Digoxin toxicity
Opioid-induced endocrinopathy
Drug-induced hyperthermia
Hypokalemic sensory overstimulation