generics for long-acting calcium channel blockers (Cardizem CD, Tiazac, etc)

There continues to be lots of confusion about generics for long-acting calcium channel blockers (Cardizem CD, Tiazac, etc).

It's hard to keep track of which long-acting diltiazem, verapamil, and nifedipine products are equivalent to each other.

For example, Adalat CC is not a generic equivalent for Procardia XL even though both are once-daily versions of nifedipine.

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