What is the treatment for beta blocker overdose?

Combination. If ingested within 2 hours of receiving treatment, activated charcoal will be given. Otherwise, the physician will use Atropine if patient is bradycardic and glucagon to enhance contractility. If refractory to the aforementioned drugs, then calcium and Insulin with dextrose can be administered.
Medical attention. Overdose of beta blocker can be serious leading to slow heart rate, blood pressure, circulatory collapse and seizures. Treatment is immediate medical attention. Depending on severity treatment includes adrenergic agents, intravenous fluid, glucagon, insulin. Bottom line seek medical attention immediately.