Re: Headaches. Which med is causing them?
Before starting EFFEXOR XR, tell your doctor about any medicines you're taking, including over-the-counter drugs and herbal supplements. Until you see how EFFEXOR XR affects you, be careful doing such activities as driving a car or operating machinery. Avoid drinking alcohol while taking EFFEXOR XR. In clinical studies, the most common side effects with EFFEXOR XR (reported in at least 10% of patients and at least twice as often as with placebo) were constipation, dizziness, dry mouth, insomnia, loss of appetite, nausea, nervousness, sexual side effects, sleepiness, sweating, and weakness. Ask your doctor if EFFEXOR XR is right for you.