What is the antidote for beta blocker overdose?

The antidote for beta blocker overdose is glucagon. Glucagon works by stimulating the heart and increasing heart rate and contractility, which can counteract the bradycardia and hypotension caused by beta blocker toxicity. It achieves this effect by bypassing the beta-adrenergic receptors, allowing for improved heart function even in the presence of beta blockers.

Other potential treatments for beta blocker overdose may include supportive care, intravenous fluids, or other medications, but glucagon is specifically recognized for its direct physiological effects that are beneficial in this scenario. The other options listed do not specifically address beta blocker effects or have different mechanisms of action that are not applicable for this particular overdose situation.