Learn more

Product description

Safety information

Side Effects

Drug Name

Effexor (Venlafaxine)

Drug Uses

Effexor is used for treating depression. It may also be used for other conditions as determined by your doctor.

How to use

Use Effexor as directed by your doctor. Check the label on the medicine for exact dosing instructions.
Effexor comes with an extra patient information sheet called a Medication Guide. Read it carefully. Read it again each time you get Effexor refilled.
Take Effexor by mouth with food.
Effexor works best if it is taken at the same time each day. Continue to take Effexor even if you feel well. Do not miss any doses.
Do not suddenly stop taking Effexor without checking with your doctor. Side effects may occur. They may include mental or mood changes, numbness or tingling of the skin, dizziness, drowsiness, confusion, headache, increased sweating, loss of coordination or balance, nausea, ringing in the ears, seizures, tremor, trouble sleeping, or unusual tiredness. You will be closely monitored when you start Effexor and whenever a change in dose is made.

Drug Class and Mechanism

Effexor is a serotonin and norepinephrine reuptake inhibitor (SNRI). It works by restoring the balance of certain natural substances in the brain (serotonin and norepinephrine), which helps to improve certain mood problems.

Missed Dose

If you miss a dose of Effexor , take it as soon as possible. If it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Do not take 2 doses at once.

Storage

Store Effexor at room temperature (68F to 77F or 20C to 25C). Keep Effexor away from children.

Warnings/Precautions

Do NOT use Effexor if:

• you are allergic to any ingredient in Effexor
• you are taking or have taken a monoamine oxidase inhibitor (MAOI) (eg, phenelzine), selegiline, or St. John's wort within the last 14 days
• you are taking a fenfluramine derivative (eg, dexfenfluramine), methylene blue, sibutramine, nefazodone, or tryptophan

Contact your doctor or health care provider right away if any of these apply to you.

Some medical conditions may interact with Effexor . Tell your doctor or pharmacist if you have any medical conditions, especially if any of the following apply to you:

• if you are pregnant, planning to become pregnant, or are breast-feeding
• if you are taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement
• if you have allergies to medicines, foods, or other substances
• if you or a family member has a history of bipolar disorder (manic-depression), other mental or mood problems, suicidal thoughts or attempts, or alcohol or substance abuse
• if you have a history of seizures, heart problems (eg, heart failure, irregular heartbeat), abnormal electrocardiogram (ECG), recent heart attack, high blood pressure, overactive thyroid, liver problems, lung problems, kidney problems, stomach or bowel bleeding, blood or bleeding problems, increased eye pressure (eg, glaucoma), nervous system problems, or metabolism problems
• if you are dehydrated, have low blood sodium levels, or drink alcohol
• if you will be having electroconvulsive therapy (ECT)

Some MEDICINES MAY INTERACT with Effexor . Tell your health care provider if you are taking any other medicines, especially any of the following:

• Certain diet medicines (eg, phentermine, fenfluramine), linezolid, lithium, MAOIs (eg, phenelzine), methylene blue, metoclopramine, nefazodone, rasagiline, selective serotonin reuptake inhibitors (SSRIs) (eg, fluoxetine), serotonin and norepinephrine reuptake inhibitors (SNRIs) (eg, duloxetine), serotonin 5-HT1 receptor agonists (eg, sumatriptan), sibutramine,St. John's wort, tramadol, trazodone, tricyclic antidepressants (eg, amitriptyline), or tryptophan because severe side effects, such as a reaction that may include fever, rigid muscles, blood pressure changes, mental changes, confusion, irritability, agitation, delirium, and coma, may occur
• Anticoagulants (eg, warfarin), aspirin, or nonsteroidal anti-inflammatory drugs (NSAIDs) (eg, ibuprofen) because the risk of bleeding, including stomach bleeding, may be increased
• Diuretics (eg, furosemide, hydrochlorothiazide) because the risk of low blood sodium levels may be increased
• Azole antifungals (eg, ketoconazole) or cimetidine because they may increase the risk of Effexor 's side effects
• Cyproheptadine because it may decrease Effexor 's effectiveness
• Aripiprazole, haloperidol, phenothiazines (eg, chlorpromazine, thioridazine), or risperidone because the risk of their side effects may be increased by Effexor

Possible Side Effects

All medicines may cause side effects, but many people have no, or minor, side effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome:

• Anxiety; blurred vision; changes in taste; constipation; decreased sexual desire or ability; dizziness; drowsiness; dry mouth; flushing; headache; increased sweating; loss of appetite; nausea; nervousness; stomach upset; trouble sleeping; vomiting; weakness; weight loss; yawning.

Seek medical attention right away if any of these SEVERE side effects occur:

• Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); bizarre behavior; chest pain or discomfort; confusion; decreased urination; fast or irregular heartbeat; fever, chills, or sore throat; memory problems; new or worsening agitation, panic attacks, aggressiveness, impulsiveness, irritability, hostility, restlessness, or inability to sit still; persistent or severe ringing in the ears; seizures; severe or persistent anxiety, nervousness, or trouble sleeping; severe or persistent cough; severe or persistent headache, dizziness, stomach pain, or weakness; shortness of breath; significant weight loss; suicidal thoughts or attempts; tremor; trouble concentrating; unsteadiness or loss of coordination; unusual bruising or bleeding; unusual or severe mental or mood changes; vision problems; worsening of depression.

More Information

If you have any questions about Effexor , please talk with your doctor, pharmacist, or other health care provider.
Effexor is to be used only by the patient for whom it is prescribed. Do not share it with other people.
If your symptoms do not improve or if they become worse, check with your doctor.