Most common side effects
	Headache Effexor can cause headaches, which often fade as your body adjusts to the medication. If you experience headaches, and they 're disruptive, talk to your doctor before you take any pain medications. S/he can let you know which medications are safe to take with Effexor .
	Nausea Most people who experience this side effect notice that it usually disappears in a few weeks. To reduce or eliminate nausea, eat several small meals per day instead of three big ones, or try snacking on dry toast or crackers.
	Sexual difficulties Changes in sexual function may include difficulty achieving orgasm, difficulty maintaining an erection, delayed ejaculation, or decreased physical sensation. These problems are sometimes the most difficult for people to discuss. They might feel embarrassed and instead of mentioning it to their physicians, they suffer with it or worse yet, stop their medication on their own. Doctors are accustomed to talking about these problems and they are trying to help you recover. Please do not hesitate to talk to your doctor if you experience this or any other side effect or risk.
	Weight loss You may experience decreased appetite and as a result, may lose weight even if you are not trying to. Try eating smaller, but more frequent meals to take in more calories. Your doctor or clinician can help you monitor your weight and suggest a high calorie (but healthy) diet for you if weight loss is a concern.
	Occasional side effects
	Anxiety/nervousness You may experience heightened anxiety or nervousness as a result of your antidepressant, but it should wear off in a few weeks. If anxiety continues to be a problem, talk to your doctor about it.
	Blurry vision Blurred vision is another side effect of Effexor . If you think that you are experiencing blurred vision, don 't drive until you talk to your doctor or clinician about it.
	Diarrhea If you experience diarrhea, drink plenty of fluids to prevent dehydration. Your doctor can tell you which anti-diarrheal products are safe to take with your medication.
	Dizziness If you feel dizzy when you sit or stand up quickly, there are some precautions that you can take to avoid injury. Get up very slowly from a laying or sitting position and make sure you have something to hold onto as you stand up. Then, wait a moment or two before you start walking.
	Dry mouth Some people taking Effexor experience dry mouth. Although dry mouth may not go away completely, it usually gets better with time. Dry mouth may be relieved by sucking on hard candy or crushed ice, drinking plenty of fluids, or eating frozen grapes.
	Insomnia If you experience insomnia as a result of your medication, your doctor may change your dose, prescribe a medicine to help you sleep, advise you to take the medication in the morning, or change your antidepressant altogether. To combat insomnia, avoid eating heavy meals, exercising, or drinking caffeinated beverages before bed.
	Risks
	Hypomania Effexor may cause an increase in mood called hypomania. Symptoms of hypomania include euphoria, racing thoughts, pressured speech, and excessive energy. If you notice any of these changes, contact your doctor right away. S/he can help you determine if your change in mood seems unusual.