Yes, it could cause sudden and unusual weight gain. This could be one of the Atenolol side effects but also a sign of overdose, so you should definitely contact your doctor about the matter.
Atenolol can also cause exercise tolerance, meaning that exercise may not have any positive outcomes.
If you have suffered from heart problems, this is a extra reason to report any weight gain to your doctor.
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It is not meant to substitute for medical advice provided by your physician or other medical professional.
If you have or suspect that you have a medical problem, promptly contact your physician or health care provider.
