It takes about 3 days for Effexor XR to reach a consistent level in your blood. So in the first week, you may experience more side effects. When you first start taking a new medication, your body has to get used to it. If you notice symptoms, be sure to talk with your doctor. You may be more likely to experience suicidal thoughts and behaviors* during the first week of treatment. But not everyone will experience side effects, and side effects can be different for each person. You may experience more side effects in your first week of treatment with Effexor XR. What are the first-week side effects of Effexor XR? But it’s not clear whether this side effect occurred in studies. ‡ An allergic reaction is possible after using Effexor XR. † To learn more about this side effect, see “Side effects explained” below. To learn more, see the “ Side effects explained” section below.
This is the most serious warning from the Food and Drug Administration (FDA). * Effexor XR has a boxed warning for this side effect. If the side effects seem life threatening or if you think you’re having a medical emergency, immediately call 911 or your local emergency number. If you develop serious side effects while taking Effexor XR, call your doctor right away. mania or hypomania (both of which cause moments of extremely high excitement and energy).
eye problems, such as closed-angle glaucoma.sexual side effects, such as erectile dysfunction and irregular ejaculation.serotonin syndrome (high level of the chemical serotonin).Serious side effects that have been reported with Effexor XR include:
In rare cases, some people may develop serious side effects from taking Effexor XR. What are the serious side effects of Effexor XR?
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