Effexor is an antidepressant with the generic name venlafaxine. Effexor acts on the brain chemicals serotonin and norepinephrine, preventing brain cells from taking up these chemicals too quickly and disturbing the function of the brain. The drug's manufacturer reports that during clinical trials, at least 10 percent of patients experienced a number of mild side effects including increased blood pressure, changes in appetite and weight, and changes in sleep patterns.
Increased Blood Pressure
When you are taking Effexor, watch for signs of increased blood pressure. These signs include severe headaches which resemble migraines, increased sweating, and blurred vision. Rapid or uneven heartbeat may also occur, according to Drugs.com. A slight increase in blood pressure would create milder headaches, blurred vision, and dizziness. If you have high blood pressure, work with your doctor to control it before taking Effexor and monitor your blood pressure regularly while taking it.
Changes in Appetite and Weight
Each individual patient will react differently to Effexor. Some patients experience altered appetite and subsequent weight due to changes in their sense of taste. These changes may be attributed to constipation and dry mouth, diarrhea, vomiting and flu-like symptoms. Talk to your doctor about these side effects, which are generally mild.
Drowsiness or Insomnia
Drowsiness and sleepiness are commonly reported side effects of Effexor, according to the manufacturer. You should be careful when driving or doing any task that requires concentration or which could be dangerous. Some patients report that Effexor affects them in the opposite way, with insomnia and trouble sleeping. If you experience either drowsiness or trouble sleeping, talk to your doctor about adjusting your dose strength. Avoid alcohol completely while taking Effexor to reduce the severity of these side effects.
Medical Complications
If you have symptoms of an allergic reaction such as a rash, swelling of the face and throat, and trouble breathing, RxList advises calling the doctor right away. The doctor should be made aware of your entire medical history, but if you are thinking of taking Effexor mention if you have had heart problems, high blood pressure, liver problems, kidney problems, an overactive thyroid, glaucoma, or problems with your metabolism (such as diabetes). Also mention all other antidepressant medications you have taken or are taking, especially the herbal medicines tryptophan or St. John's wort, because adding Effexor may cause serotonin syndrome.
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