Drug Information on venlafaxine includes drug pictures, side effects, drug interactions, directions for use, symptoms of overdose, and what to avoid. Find a comprehensive guide to possible side effects including common and rare side effects when taking Effexor (Venlafaxine Hydrochloride) for healthcare. Venlafaxine is used to treat major depressive disorder, anxiety, and panic disorder. Learn about side effects, interactions and indications. If you drink alcohol, talk to your doctor. Some people can't concentrate properly while they're taking venlafaxine. They may want to review your treatment. You can drink alcohol while taking venlafaxine but it may make you feel sleepy. Older adults may be at higher risk than younger people for low sodium levels in their blood when taking sire. Skip the missed dose if it is almost time for your next scheduled dose. Common side effects These side effects happen in more than 1 in people. Keep taking the medicine, but tell your doctor or pharmacist if these side effects bother you or don't go away:. For people with increased eye pressure glaucoma : Venlafaxine can widen your pupils and block the flow of fluid in your eye. It may also affect your ability to make decisions, think clearly, or react quickly. Some people might find they gain weight. What to do about: feeling sick - try taking venlafaxine with or after food. A black box warning alerts doctors and patients hcl xl 300 drug effects that may be dangerous. Venlafaxine side effects. Explore Apps. Talk to your doctor if they last longer than a week or are severe. You may need to take venlafaxine during pregnancy if you need it to remain well. Call your doctor right away if you become pregnant while taking this drug. To help avoid interactions, your doctor should manage all of your medications carefully. Drug Class. For people with a history of seizures: Venlafaxine raises your risk of seizures. Important warnings. Talk to your doctor about other drug options that may work for you.