Thanks for coming to HCM. Bisoprolol
has side effect of rapid weight gain sometimes, but you should look for other reasons too. Sometimes, the food that looks healthy is rich in calories, also canned food has lots of additive. There can be other reasons too like hormonal
imbalance etc. Discuss your exercise plan with gym instructor who can guide you best exercise plan by which you can achieve your target weight.
Wish you good health!