Venlafaxine: Approved Uses, Warnings and Online Care

What venlafaxine is

Venlafaxine belongs to a class of antidepressants called serotonin and norepinephrine reuptake inhibitors (SNRIs). It comes as a generic and under the brand name Effexor XR, an extended-release capsule. Generic immediate-release tablets are also sold.

Generic extended-release tablets also exist. These forms sound alike, but their labels are not identical, which matters more for venlafaxine than for many medicines. It is worth checking which one is on your pharmacy label.

What each form is approved for, and off-label uses

The Food and Drug Administration (FDA) approval depends on the product you are looking at. All of these approvals are for adults, and the labels below come from the current versions on DailyMed.

• Effexor XR capsules: major depressive disorder, generalized anxiety disorder, social anxiety disorder and panic disorder.
• Venlafaxine extended-release tablets: major depressive disorder and generalized anxiety disorder.
• Venlafaxine immediate-release tablets: major depressive disorder.

Off-label uses, including PTSD

Venlafaxine is not FDA-approved for PTSD, so that use is off-label. The VA National Center for PTSD says only sertraline and paroxetine have FDA approval for PTSD. It also says venlafaxine is a strongly recommended treatment for PTSD in the 2023 VA/DoD guideline, based on large studies. You can read more in our guide to SSRIs and venlafaxine for PTSD.

MedlinePlus says venlafaxine is also sometimes used to treat hot flashes in women who have gone through menopause or who take medicine for breast cancer. That use is off-label as well.

How venlafaxine is thought to work

The label says the way venlafaxine works is unclear, but it is thought to raise the activity of serotonin and norepinephrine, two brain chemicals, by slowing their reuptake. The VA guide adds that it acts mainly on serotonin at lower amounts and on both chemicals at higher amounts.

What taking venlafaxine can be like

MedlinePlus says it may take several weeks or longer to feel the full benefit, so early weeks do not tell the whole story. The National Institute of Mental Health (NIMH) notes that people respond to medicines differently, and that it may take several tries to find the one with the most benefit and fewest side effects.

The Effexor XR label says the capsules are taken with food and swallowed whole, not divided, crushed or chewed. Your prescriber and pharmacist can explain how your own form should be taken.

Do not stop venlafaxine suddenly or without talking to your prescriber. The label reports symptoms such as dizziness, nausea, anxiety, confusion, headache, trouble sleeping and shock-like sensations after abrupt stopping or a lower dose, and says these can be severe and long lasting.

Side effects and warnings

Boxed warning: antidepressants increased the risk of suicidal thoughts and behaviors in children, teens and young adults in short-term studies. Effexor XR is not approved for anyone under 18. MedlinePlus says the risk may be more likely in the first few months and when a dose goes up. Anyone taking an antidepressant should be watched closely for worsening mood or new thoughts of suicide. If you are in crisis, call or text 988 or call 911. Locascio Wellness does not provide emergency services, and our crisis resources page lists other options.

Dangerous combinations: the label says venlafaxine must not be taken with monoamine oxidase inhibitors (MAOIs), including linezolid and intravenous methylene blue, or within 14 days of stopping one, because of serotonin syndrome. People allergic to venlafaxine or desvenlafaxine should not take it. Other medicines raise the serotonin syndrome risk, including triptans, tramadol and St. John's wort, so tell your prescriber everything you take.

The most commonly reported side effects on the Effexor XR label are nausea, sleepiness, dry mouth, sweating, abnormal ejaculation, loss of appetite, constipation, erection problems and lower sex drive.

• Blood pressure: the label reports dose-related increases and says blood pressure should be checked before and during treatment.
• Bleeding: the risk may go up, especially with aspirin, anti-inflammatory pain relievers or warfarin.
• Serotonin syndrome: agitation, fast heartbeat, high temperature, loss of coordination and vomiting need urgent care.
• Also on the label: angle-closure glaucoma, mania or hypomania in people with bipolar disorder, seizures, low sodium, and rare lung problems such as interstitial lung disease.

Can venlafaxine be managed online in Pennsylvania and New York

The label says venlafaxine is not a controlled substance, and it describes no restricted program or certified setting. Blood pressure cannot be taken over video, so ask how those checks would be handled, for example with a home cuff or your primary care office.

A licensed psychiatrist on our team, a Doctor of Osteopathic Medicine (DO), treats anxiety, depression and trauma online by secure video, for people physically located in Pennsylvania or New York during each visit. Whether it is an option for you is a decision for you and your prescriber. Ask us whether our psychiatrist can help.

Our therapists do not prescribe. They see clients in Pennsylvania, West Virginia, Arizona, Colorado and Florida, not New York, so a New York reader can get psychiatry here but not therapy here. Ask us about fees, coverage and whether this fits your situation.