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Met XL is a beta blocker
Beta blocker should NOT be stopped suddenly.
It has to be tapered - step wise - over a period of time.
You can switch to another selective beta blocker, it it is a must.
You can take a medicine from a different class altogether.
There are several classes of drugs and several drugs in each class - the choice is wide.
Discuss with your doctor.
You may have a second opinion
Wishing speedy recovery