Examples of Calcium Channel Blockers? How do they work and what are they used for?

a) Metformin, Glipizide; Increase insulin sensitivity; Diabetes
b) Verapamil, Amlodipine; Block calcium entry; Hypertension
c) Aspirin, Clopidogrel; Inhibit platelet aggregation; Stroke prevention
d) Albuterol, Ipratropium; Bronchodilation; Asthma