Cardiovascular
Hypotension (any CCB overdose)
Bradycardia (usually only seen with verapamil/diltiazem)
AV/sinus block
CHF
Pulmonary
Respiratory depression
Pulmonary edema
GI
Nausea/vomiting
Neurologic
Lethargy, confusion, coma
Metabolic
Hyperglycemia
CCB inhibits insulin release from pancreatic islet cells leading to decreased glucose uptake in the myocardium
Helps to differentiate from Beta-Blocker Toxicity
Correlates with severity of overdose and poor outcomes
Hypotension (any CCB overdose)
Bradycardia (usually only seen with verapamil/diltiazem)
AV/sinus block
CHF
Respiratory depression
Pulmonary edema
Nausea/vomiting
Lethargy, confusion, coma
Hyperglycemia
CCB inhibits insulin release from pancreatic islet cells leading to decreased glucose uptake in the myocardium
Helps to differentiate from Beta-Blocker Toxicity
Correlates with severity of overdose and poor outcomes
CCB inhibits insulin release from pancreatic islet cells leading to decreased glucose uptake in the myocardium
Helps to differentiate from Beta-Blocker Toxicity
Correlates with severity of overdose and poor outcomes
Calcium channel blocker toxicity
Cardiac
Tricyclic antidepressant toxicity
Inferior MI 
Clonidine toxicity
Sick sinus syndrome
Beta-blocker toxicity
Neurocardiogenic/reflex-mediated