Brief Answer: Low sugar Detailed Answer: The class of medications that atenolol belongs to has been uncommonly associated with low sugar reactions. The exact mechanism by which it does so, is not clearly understood. It is possible that it may increase the insulin production or drive down glucose production. However these are only proposed scientific theories. The evidence in published literature regarding atenolol and low sugar reactions is of poor quality to prove any definite association. Atenolol can also mask the symptoms of low sugar reactions, when they occur, regardless of the cause. For example, a person experiencing truly low sugar levels in the body (below 65 mg/dl) may report palpitations (sensation of heart racing), sweating and tremulousness (shaky, tremors). Atenolol can blunt these responses of the body and hence make a person more vulnerable to the complications of low sugar because the body is unable to recognize the symptoms early on. The individual thus delays taking defensive action like accessing food to raise blood sugar and prevent further more sever sever drops that can be XXXXXXX What I recommend to you is to first document the sugar level especially when your symptoms occur. If it is indeed below 65 then see an endocrinologist in person in order to rule out uncommon but worrisome conditions like insulinoma. People have tried going off the suspected medication and if the low sugar goes away then it is possible the medication was responsible

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Brief Answer: Follow up Detailed Answer: There is a condition called 'Reactive hypoglycemia' in which individuals who are prone to it, have a steep fall in blood sugar particularly after carbohydrate rich meals. It is a complex entity and presents with vague manifestations. It is therefore tricky to diagnose and often even manage. But the important thing is to not miss the presence of the more worrisome causes like insulinoma (a tumor, but typically benign)

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