Depends on what type of medication you are taking whether an IR prepration or Er preparation.

I think you are taking propranolol 20 mg. Beta blockers primarily reduce the heart rate. So during intense cardio exercises, it can reduce exercise capacity and cause fatigue.

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Consult a psychologist first

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Beta-blockers can reduce exercise tolerance by limiting the normal rise in heart rate. If you feel dizzy, unusually weak, or breathless during workouts, consult your doctor about the dose/need for the beta-blocker. Do not stop it abruptly.