Acute Overdose Toxicity

Information regarding venlafaxine toxicity in overdose is limited to isolated case reports. Unfortunately, most of these cases also include significant coingestants, confounding the interpretation of "pure" venlafaxine toxicity. Sympathetic nervous system stimulation, via inhibition of norepinephrine reuptake, predisposes patients to tachycardia, hypertension, diaphoresis, tremor, and mydriasis. These symptoms are frequently seen in venlafaxine overdoses. Severe hypotension, requiring vasopressors, was reported one case. Otherwise, most vital sign abnormalities are of moderate severity and do not require specific pharmacologic therapy. CNS sedation is also commonly reported and occasionally progresses to coma requiring endotracheal intubation and ventilatory support. Generalized seizures are frequently reported and tend to occur early after ingestion. Electrocardiographic abnormalities include sinus tachycardia, QRS widening, and QTc interval prolongation. In most cases, symptoms completely resolve gradually over 36 h with supportive care alone.

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