Effexor, generically known as venlafaxine, is a medication used in the treatment of mental depression. The drug may also be prescribed for use in treating anxiety disorders and anxiety symptoms. It has also found uses fighting panic disorders and controlling hot flashes or flushing. Effexor is sold as a pill or as an extended release pill or capsule (Effexor-XR).
Common Temporary Side Effects
Some side effects are temporary and common, though the Mayo Clinic notes that you should consult your physician if these effects bother you or if they do not go away after a few days. The more common temporary side effects of Effexor include losing weight, having abnormal dreams, vomiting, nervousness, abnormal tiredness, anxious feelings and chills. Others may include constipation, insomnia, shaking, decreased libido, trembling, diarrhea, tingling, dizziness, sensations of burning, mouth dryness, sensations of prickliness, indigestion, nasal congestion, abnormal sweating, runny nose, appetite loss, abdominal pain or gas.
Less Common Temporary Side Effects
Less common side effects may include night sweats, changes in the way things taste, yawning and tension in the muscles. Again, these usually do not require medical attention and usually go away on their own.
Overdose Side Effects
The common dose of Effexor may range from 75 to 225mg per day, depending on your doctor's orders. If you take too much, you may experience serious side effects that must be treated at an emergency room. Overdose side effects include agitation, rapid heartbeat (tachycardia), seizures or convulsions, severe weakness, or tiredness or drowsiness.
Withdrawal Side Effects
When you stop taking Effexor, you may experience some temporary side effects. Not all of these are serious, but consult your doctor if you get any of them after you quit Effexor. These may include out-of-control actions, anxiety, dream abnormalities, irregular heartbeats, seizures, crying, hyperventilation, depersonalization, loss of hearing, uncoordination, headaches, dizziness, feeling generally sick, euphoria or dysphoria, fear, paranoia, nausea, depression, changes in mood, nervousness, muscle twitching and others.
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