[Resolved]  Abbott — calaptin 120sr

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I am cardiac patient having undergone aortic valve replacement in 2016 with tissue valve. I am 70 year old. I have been using calaptin 120 sr twice a day to control psvt for over 30 years now. It has served me well all these years but of late i feel breathlessness and feel like resting, my exercises tolerance is still good despite the feeling. My hear rate is around 62 while awake and 55 while resting. I wish to know at what rate the sr tablet released drug into the body. Can i switch over 80 mg thrice a day, which option is better. Physician has suggeste sr only