What if any is the difference between diltiazem er and diltiazem cd?

Generic vs brand: There's no difference in the drug but the delivery may differ. The CD is always a 24 hour preparation. The ER version may be either 12 hour or 24 hour, so you must read your label or check with your pharmacist.. The 12 hour versions are generally smaller mg doses (60, 90, or 120 mg) while the 24 hour is usually 120 mg or higher.

ER stands for extended-release and CD stands for controlled delivery. Both medications are usually taken once a day. However, the diltiazem ER product may say “12-hour” or “24-hour”; if it’s the “12-hour” product, it’s usually taken twice a day, while the “24-hour” product is usually just once a day. So it depends on the specific diltiazem ER product a person has.