Effexor XR

Drug Name Effexor XR

Effexor XR (Venlafaxine)

Drug Uses Effexor XR

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

Drug Class and Mechanism Effexor XR

Effexor XR 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.

How Taken Effexor XR

Use Effexor XR as directed by your doctor. Check the label on the medicine for exact dosing instructions.
Effexor XR comes with an extra patient information sheet called a Medication Guide. Read it carefully. Read it again each time you get Effexor XR refilled.
Take Effexor XR by mouth with food.
Effexor XR works best if it is taken at the same time each day. Continue to take Effexor XR even if you feel well. Do not miss any doses.
Do not suddenly stop taking Effexor XR 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 XR and whenever a change in dose is made.

Warnings Precautions Effexor XR

Do NOT use Effexor XR if:

• you are allergic to any ingredient in Effexor XR
• 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

• 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)

• 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 XR's side effects
• Cyproheptadine because it may decrease Effexor XR's effectiveness
• Aripiprazole, haloperidol, phenothiazines (eg, chlorpromazine, thioridazine), or risperidone because the risk of their side effects may be increased by Effexor XR

Missed Dose Effexor XR

If you miss a dose of Effexor XR, 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 Effexor XR

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

Possible Side Effects Effexor XR

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.

• 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.