What's the difference between Verapamil SR and Verapamil ER?

Posted on Sat, 22 Mar 2014

Question: What's the difference between Verapamil SR and Verapamil ER? The pharmacist says they're identical, but if that's the case, why do they make 2 versions (SR and ER)?

Answered by Dr. Rakesh Madhyastha (32 minutes later)

Brief Answer: No difference between SR and ER Detailed Answer: Hello Thanks for the query Your pharmacist was right, there is no difference in ER ( extended release) and SR ( sustain release). It has been used interchangeably. SR is an old terminology as compared to ER which is a newer terminology. It is just a method of drug delivery system where the drug gets released over a prolonged period of time. There is another term used known as PR ( pulsatile release) which is equal to SR and ER. So to sum it all up SR=ER=PR. I hope I was of help, if you have any further queries please get back to me Regards

Above answer was peer-reviewed by : Dr. Raju A.T