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Can Effexor Cause Serotonin Syndrome? | Signs To Spot Early

Yes—venlafaxine can trigger serotonin toxicity, most often after a dose change or when mixed with other serotonin-raising drugs. Effexor (venlafaxine) is widely prescribed, and most people take it without ever facing serotonin syndrome. Still, the warning is real. The official labeling lists serotonin syndrome as a risk, and the risk climbs when venlafaxine is paired

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