Venlafaxine

Effexor (venlafaxine) is a prescription medication used to treat major depressive disorder, generalized anxiety disorder, social anxiety disorder, and panic disorder in adults. Venlafaxine is used for Major Depressive Disorder, Generalized Anxiety Disorder and Social Anxiety Disorder.

Also called: Venlalic (United Kingdom) · Enlafax (Australia)

Pronunciation: (eh-FEKS-or / ven-LA-fax-een).

Generic name
venlafaxine
Brand names
Efexor XL, Efexor XR, Viepax XR, Efectin XR, Venlor XR, Efexor-XR
Drug class
Serotonin-Norepinephrine Reuptake Inhibitor (SNRI)

Availability and supply rules vary by country

Trade names by country: United States · United Kingdom · Canada · Australia · India · Nepal · New Zealand

Australia: Efexor-XR, Elaxine, VENLAFAXINE XR-WGR, Venlafaxine generichealth, APO-Venlafaxine, Enlafax-XR, Sandoz Venlafaxine, BTC Venlafaxine · Full directory

What venlafaxine is and how it works

Effexor (venlafaxine) is a prescription medication used to treat major depressive disorder, generalized anxiety disorder, social anxiety disorder, and panic disorder in adults. It belongs to a group of antidepressants called serotonin-norepinephrine reuptake inhibitors (SNRIs), which work by increasing the levels of serotonin and norepinephrine in the brain to help improve mood and reduce anxiety symptoms. Patients should know that Effexor may take several weeks to show its full effect. It is important to take the medication exactly as prescribed and not to stop suddenly, as this can cause withdrawal symptoms. Always consult your healthcare provider before making any changes to your medication. (1)

Uses, formulations, monitoring, and supply rules can differ by patient, product, and country. Follow the exact local product information and professional advice.

Mechanism of action: how venlafaxine works

Venlafaxine is a serotonin-norepinephrine reuptake inhibitor (SNRI). It inhibits the reuptake of serotonin and norepinephrine, increasing their levels in the synaptic cleft. At lower doses, venlafaxine primarily affects serotonin; at higher doses, it also inhibits norepinephrine reuptake. This dual action is thought to contribute to its antidepressant and anxiolytic effects. (2) (1)

What is Venlafaxine used for?

Major Depressive Disorder

Major Depressive Disorder (1)

Generalized Anxiety Disorder

Generalized Anxiety Disorder (1)

Social Anxiety Disorder

Social Anxiety Disorder (1)

Panic Disorder

Panic Disorder (1)

Before taking venlafaxine

Do not take / not appropriate for

  • hypersensitivity to venlafaxine, concurrent use with MAOIs or within 14 days of discontinuing an MAOI, and uncontrolled narrow-angle glaucoma. (Contraindication) (1)

Tell your clinician about

(1)

Venlafaxine dosage and how to take it

  • General Instructions: Take Effexor exactly as prescribed by your doctor, usually once daily with food. Do not crush, chew, or split extended-release capsules.. Adult Dosing: The typical starting dose for depression or anxiety is 75 mg per day, which may be increased gradually up to a maximum of 225 mg per day, depending on response and tolerability.. Pediatric Dosing: Effexor is not generally recommended for use in children or adolescents under 18 years of age for depression or anxiety, except in specific cases as determined by a specialist.. Administration: Swallow the capsule whole with water, preferably at the same time each day. Take with food to reduce stomach upset.. When To Stop: Do not stop Effexor suddenly without consulting your doctor, as this can cause withdrawal symptoms. Your doctor will guide you on how to taper the dose safely.. Storage: Store at room temperature (68–77°F or 20–25°C), away from moisture and heat. Keep out of reach of children.
  • This page does not provide a dose calculator. Dosing must follow the prescriber, pharmacist, or product label.
(1)

Procedures and treatment changes

Tell the treating team before surgery, procedures, or any medicine change. Do not alter treatment without the responsible clinician. (1)

Missed dose

If you miss a dose, take it as soon as you remember. If it is almost time for your next dose, skip the missed dose and resume your regular schedule. Do not take an extra dose to catch up.

Overdose

In case of overdose, seek emergency medical attention or call your local poison control center immediately. Symptoms may include rapid heartbeat, severe drowsiness, seizures, or loss of consciousness. (1)

Venlafaxine side effects

Side effects and their urgency vary; report severe, persistent, or concerning symptoms to a healthcare professional.

Nausea

Incidence: Common

Drowsiness (somnolence)

Incidence: Common

Dry mouth

Incidence: Common

Excessive sweating

Incidence: Common

Abnormal ejaculation

Incidence: Common

Reduced appetite

Incidence: Common

Constipation

Incidence: Common

Impotence (in men)

Incidence: Common

Decreased libido

Incidence: Common

Serious warnings

BOXED WARNING — serious

Symptoms: BOXED WARNING: Antidepressants, including Effexor, increased the risk of suicidal thoughts and behavior in pediatric and young adult patients in short-term studies. Close monitoring is essential, particularly early in treatment or after a dose change. Effexor is not approved for use in children.

Action: Follow the urgency stated and seek prompt or emergency care when indicated. (1)

May increase blood pressure — serious

Symptoms: May increase blood pressure; regular monitoring is recommended. Risk of serotonin syndrome, especially if combined with other serotonergic drugs. May cause withdrawal symptoms if stopped abruptly. Use caution in patients with a history of seizures or bipolar disorder.

Action: Follow the urgency stated and seek prompt or emergency care when indicated. (1)

Contraindications recorded in the clinician database — serious

Symptoms: Contraindications recorded in the clinician database: Contraindications include hypersensitivity to venlafaxine, concurrent use with MAOIs or within 14 days of discontinuing an MAOI, and uncontrolled narrow-angle glaucoma. Use with caution in patients with hypertension, cardiovascular disease, seizure disorders, bipolar disorder, renal or hepatic impairment, and those at risk of bleeding.

Action: Follow the urgency stated and seek prompt or emergency care when indicated. (1)

Interactions

Medicine or testEffectAction
Recorded interactionsEffexor can interact with other medications, including MAOIs, other antidepressants, blood thinners, NSAIDs, certain migraine medications (triptans), and drugs that affect serotonin levels. Always inform your healthcare provider about all medicines and supplements you are taking to avoid serious interactions. (2)

Pregnancy, breastfeeding, kidney/liver function, age

Pregnancy

Exposure during the third trimester may increase the risk of poor neonatal adaptation symptoms after birth. A pregnancy exposure registry monitors outcomes for people who take Effexor during pregnancy. Discuss the risks and benefits of continuing treatment during pregnancy with the clinician managing your care. (1)

Breastfeeding

Venlafaxine and its active metabolite have been found in human milk in published studies, without adverse reactions observed in the nursing infants studied. Discuss breastfeeding plans with your healthcare provider so they can advise on monitoring the infant. (1)

Children

Frequency: Not applicable.. Weight Based: Not recommended for pediatric use.. Max Daily Dose: Not applicable.. Max Single Dose: Not applicable.. Age Restrictions: Safety not established in children. (1)

Monitoring

(1)

Storage

Store at room temperature (68–77°F or 20–25°C), away from moisture and heat. Keep out of reach of children.

Study the drug class: SNRIs and other antidepressants (practice MCQs)

Professional information

Clinician-facing context only. This section does not replace current product labeling.

General

Indication: Major Depressive Disorder

Dose summary: Initial dose of 75 mg/day, administered in two or three divided doses or as a single extended-release dose.

Renal context: FDA label (Effexor XR): reduce the total daily dose by 25% to 50% in patients with mild (CLcr 60-89 mL/min) or moderate (CLcr 30-59 mL/min) renal impairment. Reduce the total daily dose by 50% or more in patients undergoing hemodialysis or with severe renal impairment (CLcr <30 mL/min). Dose reduction should be individualized by the prescriber based on response and tolerability. (2) (1)

Mechanism of action

Hepatic guidance

FDA label (Effexor XR): reduce the total daily dose by 50% in patients with mild (Child-Pugh Class A) to moderate (Child-Pugh Class B) hepatic impairment. Reduce the total daily dose by 50% or more in patients with severe hepatic impairment (Child-Pugh Class C) or hepatic cirrhosis. Because individual variability may be increased, further dose adjustment should be individualized based on clinical response and tolerability.

Frequently asked questions

How long does it take for Effexor (venlafaxine) to work?

It may take 2 to 4 weeks to notice significant improvement in mood or anxiety symptoms. Some people may experience benefits sooner, but full effects can take up to 6–8 weeks.

Can I stop taking Effexor suddenly?

No. Stopping Effexor abruptly can cause withdrawal symptoms such as dizziness, headache, irritability, nausea, and sensory disturbances. Always consult your doctor before discontinuing.

Is Effexor safe during pregnancy or breastfeeding?

Effexor should only be used during pregnancy or breastfeeding if clearly needed and prescribed by your doctor, as it may pose risks to the baby. Discuss benefits and risks with your healthcare provider.

What should I do if I miss a dose?

Take the missed dose as soon as you remember. If it is almost time for your next dose, skip the missed dose. Do not take an extra dose to make up for it.

Can Effexor cause weight gain or loss?

Effexor may cause weight changes in some people, most commonly mild weight loss due to decreased appetite. Significant weight changes should be discussed with your doctor.

Are there foods or drinks I should avoid?

Avoid alcohol, as it can increase drowsiness and other side effects. There are no specific foods to avoid, but maintain a healthy diet and stay hydrated.

What are the signs of serotonin syndrome?

Symptoms include agitation, confusion, rapid heart rate, high blood pressure, dilated pupils, muscle rigidity, fever, and sweating. Seek emergency help if these occur.

What happens if I take too much Effexor (venlafaxine)?

Taking too much Effexor (venlafaxine) can lead to serious symptoms such as increased heart rate, seizures, drowsiness, dizziness, and even coma. If you suspect an overdose, it is crucial to seek immediate emergency medical attention. Contact emergency services or go to the nearest emergency room without delay, as prompt treatment is essential for a positive outcome.

Can I drink alcohol while taking Effexor (venlafaxine)?

It is generally not recommended to consume alcohol while taking Effexor (venlafaxine). Alcohol can intensify the central nervous system depressant effects of venlafaxine, leading to increased drowsiness, dizziness, and impaired coordination. This combination can also worsen symptoms of depression or anxiety. Always discuss alcohol consumption with your healthcare provider to understand the specific risks for your situation.

Is Effexor (venlafaxine) safe during pregnancy?

The safety of Effexor (venlafaxine) during pregnancy is a complex matter. It is categorized as a medication where the risks and benefits need careful consideration. If you are pregnant, planning to become pregnant, or breastfeeding, it is imperative to consult your doctor. They can assess your individual circumstances, discuss potential risks to the baby, and help you make an informed decision about your treatment.

What is the mechanism of action of venlafaxine?

Venlafaxine is a serotonin-norepinephrine reuptake inhibitor (SNRI). It inhibits the reuptake of serotonin and norepinephrine, increasing their levels in the synaptic cleft. At lower doses, venlafaxine primarily affects serotonin; at higher doses, it also inhibits norepinephrine reuptake. This dual action is thought to contribute to its antidepressant and anxiolytic effects. (2) (1)

What is the generic name of Venlafaxine?

The generic name is venlafaxine. It is sold under brand names including Efexor XL, Efexor XR, Viepax XR, Efectin XR, Venlor XR, Efexor-XR.

What class of drug is venlafaxine?

Venlafaxine is classed as: Serotonin-Norepinephrine Reuptake Inhibitor (SNRI).

References

  1. EFFEXOR XR (venlafaxine hydrochloride) extended-release capsule — FDA DailyMed consumer labeling · · accessed 2026-08-07 · source 1
  2. Clinician-authored medicine record for Effexor (venlafaxine) (MedGuideGlobal medicines database) · · accessed 2026-08-07 · source 2
  3. VENLAFAXINE HYDROCHLORIDE CAPSULE, EXTENDED RELEASE [MACLEODS PHARMACEUTICALS LIMITED] — US prescribing information (DailyMed SPL)U.S. National Library of Medicine (DailyMed) · US · accessed 2026-08-14 · source 3
  4. Venlafaxine — FDA approval record (Drugs@FDA ANDA077653)U.S. Food and Drug Administration · US · accessed 2026-08-14 · source 4
  5. venlafaxine — RxNorm normalized drug concept (RXCUI 235988)U.S. National Library of Medicine (RxNorm) · US · accessed 2026-08-14 · source 5

Brand names by country

Single-ingredient venlafaxine names are shown separately by country. Product availability, strengths, and supply rules can change; combination products are not included here.

Priority countries

United States

  • Effexor XRcapsule, extended release · 75 mg, 150 mg, 37.5 mg · viatris specialty llcregulator source

India

Source-listed products; local stock and regulatory approval have not been confirmed. Check the exact ingredient, strength, and formulation with a pharmacist.

  • Veniz XR 75 CapsuleCapsule PR · 75mg · Sun Pharmaceutical Industries Ltdpharmacy source recorded · checked 2026-09-24
  • Venlor-XR 75 CapsuleCapsule PR · 75mg · Cipla Ltdpharmacy source recorded · checked 2026-09-24
  • Ventab XL 75 Tablet PRTablet PR · 75mg · Intas Pharmaceuticals Ltdpharmacy source recorded · checked 2026-09-24
  • Venla -XR 75 capsuleCapsule PR · 75mg · Eris Lifesciences Ltdpharmacy source recorded · checked 2026-09-24
  • VenLIFT OD 150 Capsule PRCapsule PR · 150mg · Torrent Pharmaceuticals Ltdpharmacy source recorded · checked 2026-09-24
  • Enafaxin 37.5 TabletTablet · 37.5mg · Zeelab Pharmacy Pvt Ltdpharmacy source recorded · checked 2026-09-24
  • Ventin XR-75 Capsule PRCapsule PR · 75mg · D D Pharmaceuticalspharmacy source recorded · checked 2026-09-24
  • Ventablet XL 150mg TabletTablet · 150mg · Intas Pharmaceuticals Ltdpharmacy source recorded · checked 2026-09-24

Nepal

Source-listed products; local stock and regulatory approval have not been confirmed. Check the exact ingredient, strength, and formulation with a pharmacist.

  • Veniz XR 150Tablet · 150mg · Sun Pharmaceutical Industries Ltd.reference source · checked 2026-09-24
  • Venlift ODTablet · 37.5 mg · Torrent Pharmaceuticals Ltd.reference source · checked 2026-09-24
  • Venlor XRTablet · 37.5mg · Cipla Ltd.reference source · checked 2026-09-24
  • Ventab XLTablet · 37.5mg · Intas Pharmaceuticals Ltd.reference source · checked 2026-09-24
View brands in additional countries.

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