Anyone know about twitching beta blockers?

Switched from attenolol 50mg to coreg 6.25mg twice a day. And im feeling weak, maybe my body is adapting. Faster pulse to, can coreg still work with a faster pulse? Its like 60 to 70 bpm at rest and 70 to 100 when walking around doing stuff and 115 when I exercise. Side affects ive been having aches n back pain,... show more Switched from attenolol 50mg to coreg 6.25mg twice a day. And im feeling weak, maybe my body is adapting. Faster pulse to, can coreg still work with a faster pulse? Its like 60 to 70 bpm at rest and 70 to 100 when walking around doing stuff and 115 when I exercise. Side affects ive been having aches n back pain, nausia, anxiety.. Any comments appreciated. Also my (EF) is 45% pulse sometimes is weak then its fast. Changes all day depending on what im doing..
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