What is Effexor, Side Effects, Dosage, Withdrawal | | RxEconsult

All Health Articles

Effexor XR (venlafaxine) Dosage, Side Effects, Withdrawal Category: Depression, Compulsion, Anxiety by - October 6, 2011 | Views: 31338 | Likes: 0 | Comment: 0  

Effexor XR | venlafaxine extended release

Medication Class: Serotonin norepinepherine reuptake inhibitor (SNRI)
Manufacturer: Pfizer
Approval date: August, 1997

What is Effexor XR and how does it work

Effexor XR is an antidepressant that increases the concentration of neurotransmitters (serotonin and norepinephrine) in the central nervous system (brain). It is an extended release formulation of Effexor (venlafaxine) that is administered once daily.

What does Effexor XR treat

  • Major depression
  • Generalized anxiety disorder
  • Social anxiety disorder
  • Panic disorder in adults.

How effective is Effexor XR

  • In 8 and 12 week studies Effexor XR was better than placebo in reducing symptoms of depression.
  • The probability of not relapsing from panic disorder over a 6 month period was 76% with Effexor XR and 55% with placebo.
  • In 6 and 8 week studies Effexor XR was better than placebo in reducing symptoms of anxiety.
  • Effexor was more effective than placebo in reducing symptoms associated with social anxiety disorder.

What are interesting facts about Effexor XR

  • It increases both serotonin and norepinephrine in the brain.
  • It is administered once daily.
  • Treats multiple conditions.

What is the dosage of Effexor XR 

75-225 mg orally once daily

What are the side effects of Effexor XR

Common: constipation, dizziness, dry mouth, insomnia, loss of appetite, nausea, nervousness, sexual side effects, sleepiness, sweating, and weakness

Serious: Suicide, mania, serotonin syndrome, seizures, high blood pressure, low blood sodium, bleeding, severe skin reactions. Abrupt withdrawal can cause symptoms such as dizziness, headache, nausea, and mood changes. 

Effexor XR drug interactions

  • Monoamine oxidase inhibitors (MAOI) (e.g., phenelzine)
  • Zyvox (linezolid)
  • St. John's Wort
  • Warfarin
  • Nonsteroidal antiinflammatory drugs (e.g., Motrin, Aleve)
  • tryptans (e.g., sumatriptan)
  • Cimetidine
  • Haldol (haloperidol)

How much does Effexor cost

Cost between $5 and $16 per capsule.

How to obtain prescription assistance for Effexor XR

For prescription assistance for Effexor XR visit the Pfizer Patient Assistance Program


Effexor XR FDA Prescribing Information and Medication Guide


The material on this site is for information only and is not a substitute for medical advice, diagnosis or treatment provided by a qualified health care provider.


Comment on this article or post an article by joining the RxEconsult community.

Please Share on Your Social Networks

For More Healthcare Insights Join Us On Twitter
and Facebook. Join The Community To Publish Articles.

Copyright 2024 RxEconsult. All Rights Reserved | Privacy Policy | Terms of Use | Sitemap