*An off-label use of a medication is a use that is not FDA-approved. Prescribers can decide to use a medication off-label because, in their professional judgment, they believe it may offer a benefit to someone.
Effexor XR, with the active ingredient venlafaxine, is an antidepressant medication in the serotonin norepinephrine reuptake inhibitor (SNRI) drug class. Effexor XR is FDA-approved as a treatment for major depression, generalized anxiety disorder, social anxiety disorder, and panic disorder.
Common side effects of Effexor XR may include nausea, sweating, fatigue, and sexual dysfunction for some who take it. While it is a safe and effective treatment for several conditions, there are risks and it may not be a suitable treatment for some individuals.
If you’re considering Effexor XR, online psychiatry platforms such as Talkiatry and Brightside Health can connect you with a provider quickly. They offer assessments and can provide a prescription if they determine Effexor XR or another medication may help your symptoms.
Boxed Warning: Venlafaxine (Effexor XR) - Risk of suicidal thoughts and behaviors in certain people
Venlafaxine, the active ingredient in Effexor XR, has a black box warning. These are the most serious types of warnings from the Food and Drug Administration (FDA). Venlafaxine can increase the risk of suicidal thoughts and behaviors in children, adolescents, and young adults. Regardless of your age, you should talk with your doctor about serious risks with venlafaxine and any other medications before starting treatment.
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Key Takeaways
Effexor XR is a prescription antidepressant medication used to treat anxiety disorders and major depression in adults.
Effexor XR, with the active ingredient venlafaxine, is a serotonin norepinephrine reuptake inhibitor (SNRI).
If you are considering Effexor XR, a good place to start is with an evaluation from a medical provider. Many online psychiatry platforms offer online assessments and medication management, such as Talkiatry or Circle Medical.
What Is Effexor XR (Venlafaxine)?
Effexor XR is a brand name SNRI antidepressant medication. It is FDA-approved for treating depression, anxiety, and other mental health conditions in adults only.1 Effexor XR is available as the generic medication venlafaxine with the same risks and treatment benefits as the branded form.
How Does Effexor XR Work?
Effexor XR is thought to work by affecting the levels of two chemical messengers in the body, serotonin and norepinephrine.1 Increased amounts of these two chemicals may help the communication between brain cells, which may improve mood and symptoms of depression and anxiety.
What Is Effexor XR Used to Treat?
Effexor XR is FDA-approved for the treatment of the following conditions in adults only:1
Effexor XR is not approved for use in children and teens.1
Off-Label (Non-FDA-Approved) Uses of Effexor XR
Effexor XR may be used off-label to treat certain conditions. An off-label use of a medication is one that is not FDA-approved. Providers can decide to use a medication off-label because, in their professional judgment, they believe it may offer a benefit to someone.
Effexor XR may be prescribed off-label for the treatment of:2
- Attention-deficit/hyperactivity disorder (ADHD)
- Obsessive-compulsive disorder (OCD)
- Premenstrual dysphoric disorder (PMDD)
- Post-traumatic stress disorder (PTSD)
How Effective Is Effexor XR?
Effexor XR has been studied as a treatment for depression, anxiety (generalized and social), and panic disorder. When studied as treatment for depression, Effexor XR has been shown to be effective in reducing symptoms of depression using a clinical evaluation scale called the Hamilton Depression Rating Scale (HAM-D). Additionally, in two long term studies using Effexor XR to treat depression, Effexor XR lowered the risk of depression relapse, or symptoms of depression coming back.3
Studies using Effexor XR to treat any anxiety or panic related disorders have shown Effexor XR to be effective for treating the conditions. Numerous studies demonstrated the effectiveness of Effexor XR in reducing symptoms of anxiety over weeks to months. These studies showed that a dose of 75 mg of Effexor XR daily was often the most effective dose. Multiple studies looking at Effexor XR for generalized anxiety did not show any significant benefit to increasing the dose above 75 mg daily. This is important to understand as higher doses of medications often increase the risk for more or more severe side effects.3
How Long Does it Take for Effexor XR to Work?
Effexor XR can take about 4-8 weeks to become fully effective, but some individuals may start to feel better after the first week or two. Each person may have a different response time based on how their body absorbs and processes the medication.
How Long Do I Need to Keep Taking Effexor XR?
The length of treatment with Effexor XR will vary by patient based on many different criteria. Quality of life, symptom management, and other medications can all be a factor when deciding to stop or continue treatment. You and your prescriber should make the decision together to stop the medication. Effexor XR has been studied in long term use for at least 6 months and has been shown to be effective.3
Common Effexor XR Side Effects
Effexor XR side effects can occur for some who take it, affecting their digestive system, sleep, appetite, and sexual functioning. Some side effects may require medical attention but many often resolve on their own.
Common side effects of Effexor XR for adults may include:*1
- Nausea
- Loss of appetite
- Dry mouth
- Constipation
- Increased sweating
- Fatigue or drowsiness
- Problems with ejaculation and erectile functioning
- Reduced sex drive
*All medications, including Effexor XR, can cause side effects that can be mild or serious. This is not a comprehensive list of all possible side effects. You should talk with your doctor about any questions you have and understand the potential side effects and benefits of any medication.
Serious Effexor XR Side Effects
For some, Effexor XR side effects may become serious or persistent. Additionally, abruptly stopping or mixing other substances with Effexor XR can worsen side effects. If serious side effects appear, seek medical care right away.
Serious side effects of Effexor XR that require immediate medical attention include:*1
- Suicidal thoughts or actions
- Bruising or unusual bleeding
- Symptoms of mania or hypomania
- Vision problems
- Elevated blood pressure
- Low sodium levels in the blood
- Seizures or convulsions
- Allergic reactions
- Muscle rigidity, tremors, fever, and/or seizures (Could be a sign of serotonin syndrome)
*All medications, including Effexor XR, can cause side effects that can be mild or serious. This is not a comprehensive list of all possible side effects. You should talk with your doctor about any questions you have and understand the potential side effects and benefits of any medication.
What Are The Long-term Effects of Taking Effexor XR?
Long term side effects from taking Effexor XR can be serious. If you take Effexor XR long term, you and your provider will need to monitor potential side effects throughout treatment, even if there are no dosing changes. A meta analysis, meaning combined data from many clinical studies, of long-term Effexor XR use found that the risk of severe side effects increases over time, especially for sexual dysfunction and significant loss of appetite. This is in addition to many non-serious adverse events like nausea, insomnia, tremor, and changes in appetite as well.4
If you have any underlying medical conditions while taking Effexor XR, your healthcare provider will monitor those conditions routinely during treatment. Doing so can identify long-term side effects early on and reduce the risk of harm.
What Are the Risks & Warnings for Effexor XR
Suicidal Thoughts & Behaviors
Venlafaxine, the active ingredient in Effexor XR, has a black box warning. These are the most serious types of warnings from the Food and Drug Administration (FDA). Venlafaxine can increase the risk of suicidal thoughts and behaviors in children, adolescents, and young adults.
Triggering Manic Episodes
For some people with bipolar disorder, taking Effexor XR may increase the risk of a manic episode. Prior to starting treatment with an antidepressant like Effexor XR, patients with depressive symptoms should be screened to determine if they are at risk for bipolar disorder.
Seizures
Patients with a history of seizures are at increased risk of experiencing episodic seizures when taking Effexor XR.
Bleeding Problems
Effexor XR can affect the body’s blood clotting process, increasing the risk of excessive bleeding.
Pregnancy Risks
Taking Effexor XR while pregnant may cause harm to an unborn baby.
Glaucoma (Serious Eye Condition)
Effexor XR can cause pupil dilation and contraction of muscles in the eye, increasing the risk of angle-closure glaucoma and vision problems.
Hyponatremia (Low Sodium in the Blood)
Taking Effexor XR can lead to serotonin and norepinephrine imbalance and increase the risk of hyponatremia (low salt levels in the blood).
Breastfeeding Risks
Effexor XR is present in breast milk and increases the risk of infant exposure to the medication.
Serotonin Syndrome
Effexor XR can create serotonin build-up in the body, increasing the risk of serotonin syndrome, a potentially life-threatening condition.
Sexual Dysfunction
Effexor XR can result in sexual dysfunction such as ejaculatory delay in men or decreased libido and orgasm in women.
Elevated Blood Pressure
Effexor XR can increase systolic and diastolic blood pressure, increasing hypertension risk.
Antidepressant Discontinuation Syndrome
People discontinuing Effexor XR abruptly may have symptoms of Effexor withdrawal, also called antidepressant discontinuation syndrome. Because of this, it is always recommended to taper the dose of medication as instructed by your provider. Do not stop taking Effexor XR or adjust your dosage on your own.
Common symptoms of Effexor XR withdrawal include dizziness, nausea, fatigue, anxiety, sweating, seizures, and electric shock sensations.
Drug Interactions
Effexor XR can have unsafe interactions with other substances and medications.
Substances you should avoid using while taking Effexor XR include:
- Additional SSRI or SNRI medications
- Tricyclic antidepressants (TCAs)
- Nonsteroidal anti-inflammatory drugs (NSAIDs)
- Monoamine oxidase inhibitors (MAOIs)
- Alcohol
- Benzodiazepines
- Blood thinners
*This is not a comprehensive list of medications that interact with Zoloft. Be sure to talk with your doctor or pharmacist about any prescription or over the counter medications you take, as well as supplements, herbs, and teas.
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Who Should Not Take Effexor XR?
Some individuals may be at a higher risk for side effects from Effexor XR. While side effects can happen for anyone, specific patient populations should be cautious with Effexor XR. Individuals taking other SNRIs, SSRIs, or medications that increase serotonin in the brain should avoid Effexor XR due to the risk of serotonin syndrome.
Discuss all health conditions with your provider so they can select the medication that is the most suitable for you.
Populations who are at an increased risk for experiencing side effects include those who are or have:1
- Liver problems
- Kidney problems
- A history of suicidal ideations
- High blood pressure
- A history of serotonin syndrome
- A history of heart conditions
- Low sodium levels in the blood
- A history of bleeding problems
- A history of stroke or other cerebrovascular problems
- Pregnant or plan to become pregnant
- Breastfeeding or plan to breastfeed
- Bipolar disorder, symptoms of mania or hypomania
- Prior allergic reactions to venlafaxine
- Prior vision issues such as glaucoma
- Have lung problems
- A history of seizures
Drug Interactions With Effexor XR
Effexor XR can have unsafe interactions with other substances and medications. Always talk with your provider about the foods, supplements, and substances to avoid while using Effexor XR.
Substances you should avoid using while taking Effexor XR include:
- Additional SSRI or SNRI medications
- Tricyclic antidepressants (TCAs)
- Nonsteroidal anti-inflammatory drugs (NSAIDs)
- Triptans, which may be used to treat migraines
- Monoamine oxidase inhibitors (MAOIs)
- Alcohol
- Blood thinners
This is not a comprehensive list of the possible interactions with Effexor XR. You should talk with your provider and your pharmacist about all prescription and over-the-counter medications, herbs, and supplements you take before starting Effexor XR.
Effexor XR Withdrawal
People discontinuing Effexor XR abruptly may have symptoms of Withdrawal, also called antidepressant discontinuation syndrome. Because of this, it is always recommended to taper the dose of medication as instructed by your provider. Do not stop taking Effexor XR or adjust your dosage on your own.
Common symptoms of Effexor XR withdrawal include dizziness, nausea, fatigue, anxiety, sweating, seizures, and electric shock sensations.
Effexor XR Dosages for FDA-Approved Treatment
Effexor doses vary depending on the condition being treated as well as the age of the individual. Based on the severity of your symptoms, your provider will determine which dose is appropriate. Typically, your provider will start you on a smaller dose first, and will then determine how effective it is for treating your symptoms. The amount may be increased if your symptoms don’t improve.
How Should I Take Effexor XR?
Take your Effexor XR dosage with food at roughly the same time each day, either in the morning or the evening. Effexor XR comes in a variety of forms, including a tablet, solution, capsule, and extended-release capsule. The pill should not be divided, chewed, crushed, or submerged in liquid unless directed otherwise by the doctor. Follow your provider’s instructions for taking your dosage every time.
What Happens If I Miss a Dose of Effexor XR?
If you forget to take your Effexor XR dose, take it as soon as you remember. If your next dose is due soon, skip the missed one and take your next scheduled dose. Never take two doses at once, and continue taking your medication as prescribed unless your provider directs you to do otherwise.1
Can You Overdose on Effexor XR?
Overdose is possible with any drug, including Effexor XR. The specific amount of Effexor XR that can lead to overdose varies depending on many individual factors. Most reported overdoses occurred with amounts that were not significantly higher than the therapeutic dose.1
Taking more Effexor XR than prescribed may be done on purpose or by accident. Also, combining Effexor XR with certain substances, such as alcohol or other central nervous system depressants, can increase the risk of overdose and have potentially dangerous effects.
What Should You Do If You Take Too Much Effexor XR?
If you believe you or someone else has overdosed on Effexor XR, call 9-1-1 or go to the nearest emergency room immediately. Symptoms of an overdose can range from mild to severe, including changes in blood pressure, nausea, changes in mental status, and seizures. Do not wait for symptoms to appear before seeking medical care.
How to Get a Prescription for Effexor XR
To get a prescription for Effexor XR in person, start with an evaluation for your symptoms. Your primary care provider, who may be a physician, nurse practitioner, or physician assistant, can help you get the process started. They may make a referral to a psychiatrist or specialist to determine if a prescription for Effexor XR should be included in your treatment plan.
Can I Get Effexor XR Prescribed Online?
To get an online prescription for Effexor XR, you will also start by getting evaluated by an online psychiatric provider. We have thoroughly reviewed platforms like Talkiatry or Circle Medical that prescribe non-controlled substances such as antidepressants and some anti-anxiety medications.
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Questions to Ask Your Provider
It is important to discuss the potential side effects of Effexor XR with your doctor, psychiatrist, or therapist you may experience immediately after starting the treatment. Ask them whether these side effects will go away on their own or if any intervention is needed.
Also, many online psychiatry services are available with convenient access to mental health care for depression and anxiety problems. Individuals may even change providers and get a mental health evaluation, diagnosis, and personalized treatment plan.
Questions to ask your care team about Effexor XR side effects may include:
- How long will it take for me to adjust to taking Effexor XR?
- How quickly can Effexor XR cause side effects?
- What are the first days of Effexor XR side effects like?
- What is the best dosage to ensure fewer side effects, especially in the first week?
- When should I reach out to you if I am experiencing side effects?
- What should I do if I want to stop taking Effexor XR?
- How will I know if I have overdosed on Effexor XR?
- Can I consume alcohol while on Effexor XR?
- How long can I expect side effects to last?
Prescriber’s Tips
Your prescriber will share important information about your Effexor XR prescription. They will explain how to take and store your medication, what to avoid when taking it, and what to do about side effects. Follow these tips for safe and effective use of Effexor XR.
- Take your medication as prescribed, do not change your dose or stop taking it unless your prescriber tells you to. Keeping a consistent dosing schedule reduces the chance of unwanted side effects. When taking antidepressants, this approach can prevent withdrawal symptoms such as dizziness, brain zaps, and flu-like symptoms.1
- Take your medication at the same time each day. Doing so can help you remember to take it, making it as effective as possible. Your healthcare provider can help determine the optimal timing based on your sleep patterns and initial medication response.
- Tell your prescriber right away if you or your child have any worsening mental health symptoms. Antidepressants have a boxed warning for increased risk of suicidal thoughts and behaviors in children under age 18 and young adults.
- You should take your first dose while you are home and not needing to drive. Effexor XR has been known to cause drowsiness in some patients, and you should avoid driving after taking Effexor XR until you know how it affects you.1
- Do not drink alcohol while taking Effexor XR.
- Tell your prescriber about all medications and supplements you take, including over-the-counter treatments. Many over-the-counter medications and supplements can interact with prescription medications.
Frequently Asked Questions
Can Effexor XR Be Used During Pregnancy?
Taking Effexor XR during pregnancy may cause harm to an unborn baby. Talk to your provider about the potential risks of taking Effexor XR during pregnancy.
Can Effexor XR Be Used While Breastfeeding?
Effexor XR is present in breast milk and may cause harm to a breastfeeding infant. Talk to your provider about the potential risks of taking Effexor XR while breastfeeding.
Is it Safe to Drive While Taking Effexor XR?
Effexor XR can make you drowsy. Avoid driving or operating dangerous equipment, at least until you find out how the medication affects your judgment or reaction times.
Is It OK to Drink Alcohol While Taking Effexor XR?
No. Combining Effexor XR and alcohol may worsen symptoms of depression and cause harmful effects on the central nervous system.
What Are Common Side Effects of Effexor XR?
Common Effexor XR side effects include nausea, reduced appetite, increased sweating, fatigue, and sexual dysfunction.
How Long Will Effexor XR Side Effects Last?
Side effects are one of the most common reasons people choose to stop taking medication. While some Effexor XR side effects can be managed and may fade away after a few weeks, some may persist unless a person stops taking the medication. Side effects can occur even when taking the medication correctly.
Can Effexor XR Worsen Symptoms at First?
Yes, some people starting Effexor XR may experience uncomfortable side effects such as increased sweating, drowsiness, and nausea. FN1 Effexor XR can also increase the risk of suicidal thoughts and behaviors in some people. If you experience worsened symptoms or side effects of any kind, contact your provider immediately.
Should I Stop Taking Effexor XR If I Experience Side Effects?
Do not stop taking Effexor XR unless you have been advised to do so by your provider. Doing so can lead to antidepressant discontinuation syndrome, also known as antidepressant withdrawal. This can cause uncomfortable symptoms, including dizziness, fatigue, irritability, and nausea.
ChoosingTherapy.com strives to provide our readers with mental health content that is accurate and actionable. We have high standards for what can be cited within our articles. Acceptable sources include government agencies, universities and colleges, scholarly journals, industry and professional associations, and other high-integrity sources of mental health journalism. Learn more by reviewing our full editorial policy.
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Effexor XR- venlafaxine hydrochloride capsule, extended release. (August 15, 2023). DailyMed.nlm.nih.gov. Retrieved from https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm
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Singh D, Saadabadi A. Venlafaxine. [Updated 2024 Feb 26]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2025 Jan-. Retrieved from https://www.ncbi.nlm.nih.gov/books/NBK535363/
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Viatris Specialty LLC. EFFEXOR XR – venlafaxine hydrochloride capsule, extended release. [Updated 2023 August]. Retrieved from: https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm
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Kamp CB, Petersen JJ, Faltermeier P, et al. The risks of adverse events with venlafaxine for adults with major depressive disorder: a systematic review of randomised clinical trials with meta-analysis and Trial Sequential Analysis. Epidemiol Psychiatr Sci. [ 2024 October]. Retrieved from: https://pubmed.ncbi.nlm.nih.gov/39440379/
We regularly update the articles on ChoosingTherapy.com to ensure we continue to reflect scientific consensus on the topics we cover, to incorporate new research into our articles, and to better answer our audience’s questions. When our content undergoes a significant revision, we summarize the changes that were made and the date on which they occurred. We also record the authors and medical reviewers who contributed to previous versions of the article. Read more about our editorial policies here.
Author: No Change
Reviewer: No Change
Primary updates: Added “Key Takeaways” feature. Edited for clarity and reorganized. Removed “History of Effexor XR”. Revised and retitled content in “What is Effexor (Venlafaxine)?”, to include “How Does Effexor XR Work?” What Is Effexor XR Used to Treat?” Added sections titled “How Effective Is Effexor XR?”, “How Long Does it Take Effexor XR to Work?” “How Long Do I Need to Keep Taking Effexor XR?”, “What Are the Long-term Effects of Effexor XR?”. Consolidated “Allergic Reactions to Effexor” and “Effexor Warnings & Associated Risks” into new “Risks” feature. Added “Who Should Not Take Effexor XR?”, “Effexor XR Withdrawal”, “How Should I Take Effexor XR?”, “How to Get a Prescription for Effexor XR”. Retitled “Questions to Ask Your Health Team” to “Questions to Ask Your Provider”. Removed “For Further Reading” section, added FAQs. Replaced “Final Thoughts” with “Prescriber’s Tips” feature.
Author: Diana Rangaves, PharmD, RPh
Medical Reviewer: Heidi Moawad, MD
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