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Why is this medication prescribed?
Venlafaxine, an antidepressant (mood elevator), is used to treat depression.
This medication is sometimes prescribed for other uses; ask your doctor or pharmacist for more information.
How should this medicine be used?
Venlafaxine comes as a tablet to take by mouth. It is usually taken two or three times a day and should be taken with food. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take venlafaxine exactly as directed. Do not take more or less of it or take it more often than prescribed by your doctor.
Continue to take venlafaxine even if you feel well. Do not stop taking venlafaxine without talking to your doctor, especially if you have taken large doses for a long time. Your doctor probably will want to decrease your dose gradually. This drug must be taken regularly for a few weeks before its full effect is felt.
What special precautions should I follow?
Before taking venlafaxine,
- tell your doctor and pharmacist if you are allergic to venlafaxine or any other drugs.
- in addition to the drugs listed in the IMPORTANT WARNING section, tell your doctor and pharmacist what other prescription and nonprescription drugs you are taking, especially anticoagulants [warfarin (Coumadin)]; cimetidine (Tagamet); indinavir (Crixivan); lithium (Eskalith, Lithobid), medication for high blood pressure; muscle relaxants; sedatives; sleeping pills; tranquilizers; and vitamins.
- tell your doctor if you have or have ever had difficulty urinating, elevated intraocular pressure, or liver, kidney, or heart disease.
- tell your doctor if you are pregnant, plan to become pregnant, or are breast-feeding. If you become pregnant while taking venlafaxine, call your doctor immediately.
- if you are having surgery, including dental surgery, tell the doctor or dentist that you are taking venlafaxine.
- you should know that this drug may make you drowsy. Do not drive a car or operate machinery until you know how this drug affects you.
- remember that alcohol can add to the drowsiness caused by this drug.
What should I do if I forget a dose?
If you take several doses per day, take the missed dose as soon as you remember it and take any remaining doses for that day at evenly spaced intervals. However, if it is almost time for the next dose, skip the missed dose and continue your regular dosing schedule.
If you take venlafaxine once a day at bedtime and do not remember to take it until the next morning, skip the missed dose. Do not take a double dose to make up for a missed one.
What side effects can this medication cause?
Side effects from venlafaxine are common:
- upset stomach
- drowsiness
- weakness or tiredness
- excitement or anxiety
- insomnia
- nightmares
- dry mouth
- skin more sensitive to sunlight than usual
- changes in appetite or weight
- headache
Tell your doctor if any of these symptoms are severe or do not go away:
- constipation
- difficulty urinating
- frequent urination
- blurred vision
- changes in sex drive or ability
- excessive sweating
If you experience any of the following symptoms, call your doctor immediately:
- jaw, neck, and back muscle spasms
- slow or difficult speech
- shuffling walk
- persistent fine tremor or inability to sit still
- fever
- difficulty breathing or swallowing
- severe skin rash
- yellowing of the skin or eyes
- irregular heartbeat
What storage conditions are needed for this medicine?
Keep this medication in the container it came in, tightly closed, and out of reach of children. Store it at room temperature and away from excess heat and moisture (not in the bathroom). Throw away any medication that is outdated or no longer needed. Talk to your pharmacist about the proper disposal of your medication.
In case of emergency/overdose
In case of overdose, call your local poison controlcenter at 1-800-222-1222. If the victim has collapsedor is not breathing, call local emergency services at911.
What other information should I know?
Keep all appointments with your doctor and the laboratory. Your doctor will order certain lab tests to check your response to venlafaxine.
Do not let anyone else take your medication. Ask your pharmacist any questions you have about refilling your prescription.
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