Effexor XR is the extended release version of a medication used to treat depression. The drug, known generically as venlafaxine, is available as a pill or capsule through a prescription from your physician. Along with depression, Effexor XR may be prescribed to treat anxiety and panic disorders, or hot flashes.
Serious Side Effects
Use of Effexor XR may cause some some side effects that are serious. These types of problems should be reported to your physician immediately. These types of side effects may include vision changes including blurring, hypertension, headaches, pain in the chest, ear noises, mood changes, rapid heartbeat or irregular heartbeat, convulsions, a rash, changes in the menstrual cycle, breathing problems, urination problems, abdominal pain, confusion, blood in the eyes, skin irritation or peeling, skin discoloration, hallucinations, loss of hearing, a fever that may be exceptionally high, pain in the eyes, lowered awareness levels, weakness and chills. Others serious side effects include hostility; need for liquids; pain in the muscles, joints, side or back; spasms or cramps in the muscles; lethargy; palpitations; paralysis; panic; nosebleeds; swelling in the cheeks, eyelids, lips, tongue or face; fainting spells; unusual bleeding; and bloody vomit. The National Institute of Health also has posted a warning about suicidal thoughts as a side effect in some younger people, up to age 24, of Effexor XR.
Common Side Effects
Venlafaxine also may cause less serious side effects that may disappear on their own. These do not require your doctor’s attention unless they continue or are a nuisance. These types of less severe side effects include anxiety, unusual dreams, nausea, diarrhea, lessened appetite, indigestion, tingling, trembling, tiredness, chills, constipation, lowered libido, drowsiness, weight loss, taste changes, night sweats and burning sensations.
Overdose Side Effects
Emergency medical attention is necessary, according to the Mayo Clinic, if you take an overdose of Effexor XR. Side effects of an overdose may include seizures; agitation; shaking; trembling; weak or tired feelings that are extreme; unusual sensations in the skin such as prickling, burning or tingling; and a rapid heartbeat.
Long-Term Side Effects
After cessation of venlafaxine use, some side effects may manifest that also require medical attention. Some of these are similar to those experienced while taking Effexor XR. These can include impulsivity, hyperventilation, lightheadedness, anxiety, ear noises, convulsions, crying, diarrhea, depersonalization, headaches, loss of hearing, fear, euphoria or dysphoria, irritability, paranoia, spinning sensations, depression, nightmares, unconsciousness, feeling of electric shocks, restlessness and over-excitement, among others.
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