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

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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)?
Posted Sat, 22 Mar 2014 in General Health
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
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