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It could be a huge dose of labetolol. Labetolol is a drug that they use with patients with hypertension (high blood pressure). It blocks the alpha and beta effects of epinephrine and norepinephrine (adrenaline) at adrenergic receptor sites in the heart, blood vessels, and lungs. This causes vasodilation and slowing of the heart rate. A huge dose could potentially be fatal.
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