Effexor XR
Generic name: venlafaxine [ VEN-la-fax-een ]
Drug class: Serotonin-norepinephrine reuptake inhibitors
What is venlafaxine?
Venlafaxine is used in adults to treat major depressive disorder, anxiety, and panic disorder.
Venlafaxine may also be used for purposes not listed in this medication guide.
Venlafaxine side effects
Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Tell your doctor right away if you have new or sudden changes in mood or behavior, including new or worse depression or anxiety, panic attacks, trouble sleeping, or if you feel impulsive, irritable, agitated, hostile, aggressive, restless, more active or talkative, or have thoughts about suicide or hurting yourself.
Effexor XR may cause serious side effects. Call your doctor at once if you have:
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blurred vision, eye pain or redness, seeing halos around lights;
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cough, chest tightness, trouble breathing;
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a seizure (convulsions);
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unusual bleeding--nosebleeds, bleeding gums, abnormal vaginal bleeding, any bleeding that will not stop;
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low blood sodium--headache, confusion, problems with thinking or memory, weakness, feeling unsteady; or
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severe nervous system reaction--very stiff (rigid) muscles, high fever, sweating, confusion, fast or uneven heartbeats, tremors, feeling like you might pass out.
Seek medical attention right away if you have symptoms of serotonin syndrome, such as: agitation, hallucinations, fever, sweating, shivering, fast heart rate, muscle stiffness, twitching, loss of coordination, nausea, vomiting, or diarrhea.
Common side effects of Effexor XR may include:
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headache, dizziness, drowsiness, tiredness;
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ringing in your ears, feeling anxious, nervous, or jittery;
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sleep problems, unusual dreams;
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tremors;
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fast heartbeats;
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blurred vision;
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nausea, vomiting, diarrhea, constipation;
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changes in weight or appetite;
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dry mouth, yawning;
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increased sweating; or
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sexual problems.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
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Warnings
Some young people may have increased suicidal thoughts when first starting a medicine to treat depression. Tell your doctor right away if you have any sudden changes in mood or behavior, or thoughts about suicide..
Do not use venlafaxine if you have used an MAO inhibitor in the past 14 days. A dangerous drug interaction could occur. MAO inhibitors include isocarboxazid, linezolid, methylene blue injection, phenelzine, and tranylcypromine.
Before taking this medicine
You should not take this medicine if you are allergic to venlafaxine or desvenlafaxine (Pristiq).
Do not use venlafaxine if you have used an MAO inhibitor in the past 14 days. A dangerous drug interaction could occur. MAO inhibitors include isocarboxazid, linezolid, methylene blue injection, phenelzine, and tranylcypromine.
Tell your doctor if you also use stimulant medicine, opioid medicine, herbal products, or medicine for depression, mental illness, Parkinson's disease, migraine headaches, serious infections, or prevention of nausea and vomiting. An interaction with venlafaxine could cause a serious condition called serotonin syndrome.
Tell your doctor if you have or have ever had:
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heart disease, high blood pressure, high cholesterol or triglycerides;
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diabetes;
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lung disease;
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glaucoma;
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a thyroid disorder;
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a seizure;
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sexual problems;
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bleeding problems;
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low blood levels of sodium; or
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liver or kidney disease.
Some young people may have increased suicidal thoughts when first starting a medicine to treat depression. Stay alert to changes in your mood or symptoms. Your family or caregivers should also watch for sudden changes in your behavior.
Taking this medicine during pregnancy could harm the baby, but stopping the medicine may not be safe for you. Do not start or stop venlafaxine without asking your doctor.
If you are pregnant, your name may be listed on a pregnancy registry to track the effects of venlafaxine on the baby.
Ask a doctor if it is safe to breastfeed while using this medicine.
How should I take venlafaxine?
Follow all directions on your prescription label and read all medication guides or instruction sheets. Your doctor may occasionally change your dose. Use the medicine exactly as directed.
Take with food at the same time each day.
Swallow the extended-release capsule or tablet whole and do not crush, chew, break, or open it.
If you cannot swallow a capsule whole, open it and mix the medicine with applesauce. Swallow the mixture right away without chewing.
Tell your doctor if you have any changes in sexual function, such as loss of interest in sex, trouble having an orgasm, or (in men) problems with erections or ejaculation. Some sexual problems can be treated.
Your symptoms may not improve for up to several weeks. Do not stop using venlafaxine suddenly, or you could have unpleasant symptoms (such as agitation, confusion, tingling or electric shock feelings). Ask your doctor before stopping the medicine.
Your blood pressure will need to be checked often.
This medicine may cause false results on a drug-screening urine test. Tell the laboratory staff that you use venlafaxine.
Store at room temperature away from moisture and heat.
What happens if I miss a dose?
Take the medicine as soon as you can, but skip the missed dose if it is almost time for your next dose. Do not take two doses at one time.
What happens if I overdose?
Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.
What should I avoid while taking venlafaxine?
Do not drink alcohol.
Ask your doctor before taking a nonsteroidal anti-inflammatory drug (NSAID) such as aspirin, ibuprofen, naproxen, Advil, Aleve, Motrin, and others. Using an NSAID with venlafaxine may cause you to bruise or bleed easily.
Avoid driving or hazardous activity until you know how this medicine will affect you. Your reactions could be impaired.
What other drugs will affect venlafaxine?
Using venlafaxine with other drugs that make you drowsy can worsen this effect. Ask your doctor before using opioid medication, a sleeping pill, a muscle relaxer, or medicine for anxiety or seizures.
Tell your doctor about all your current medicines. Many drugs can affect venlafaxine, especially:
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any other antidepressant;
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amphetamines;
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fentanyl;
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cimetidine;
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tramadol;
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St. John's wort, tryptophan (sometimes called L-tryptophan);
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diet pills, weight loss medicine (such as phentermine);
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a blood thinner (warfarin, Coumadin, Jantoven);
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medicine to treat mood disorders, thought disorders, or mental illness--buspirone, lithium, and many others; or
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migraine headache medicine--sumatriptan, zolmitriptan, and others.
This list is not complete and many other drugs may affect venlafaxine. This includes prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible drug interactions are listed here.
Popular FAQ
How long do venlafaxine withdrawal symptoms last?
Venlafaxine withdrawal symptoms typically last up to 3 to 4 weeks, but may persist even longer. You should avoid abruptly stopping venlafaxine treatment unless otherwise directed by your healthcare provider. Gradually reducing the dose over 4 weeks can help to prevent severe withdrawal symptoms in most people. Continue reading
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Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.
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