Venlafaxine (Systemic)

Brand Names : Effexor, Effexor XR

Side Effects of This Medicine

Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor as soon as possible if any of the following side effects occur :

More common

Changes in vision, such as blurred vision; decrease in sexual desire or ability; headache

Less common

Chest pain; fast or irregular heartbeat; mood or mental changes; ringing or buzzing in ears

Rare

Convulsions (seizures); itching or skin rash; lightheadedness or fainting, especially when getting up suddenly from a sitting or lying position; lockjaw; menstrual changes; problems in urinating or in holding urine; swelling; talking, feeling, and acting with excitement and activity you cannot control; trouble in breathing

Symptoms of overdose

Agitation; convulsions (seizures); drowsiness; extreme tiredness or weakness; fast heartbeat; tingling, burning, or prickling sensations; trembling or shaking

This medicine may also cause the following side effect that your doctor will watch for:

More common

High blood pressure

Other side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. However, check with your doctor if any of the following side effects continue or are bothersome:

More common

Abnormal dreams; anxiety or nervousness; chills; constipation; diarrhea; dizziness; drowsiness; dryness of mouth; heartburn; increased sweating; loss of appetite; nausea; stuffy or runny nose; stomach pain or gas; tingling, burning, or prickly sensations; trembling or shaking; trouble in sleeping; unusual tiredness or weakness; vomiting; weight loss

Less common

Change in sense of taste; muscle tension; yawning

After you stop using this medicine, your body may need time to adjust. The length of time this takes depends on the amount of medicine you were using and how long you used it. During this period of time check with your doctor if you notice any of the following side effects:

Changes in dreaming; dizziness; dryness of mouth; headache; increased sweating; nausea; nervousness; trouble in sleeping; unusual tiredness or weakness

Other side effects not listed above may also occur in some patients. If you notice any other effects, check with your doctor.