Pristiq (Desvenlafaxine) for Anxiety
An SNRI medication effective for both anxiety and depression
What is Pristiq?
Pristiq (desvenlafaxine) is a serotonin-norepinephrine reuptake inhibitor (SNRI) that's FDA-approved for major depressive disorder. It's also commonly prescribed off-label for anxiety disorders due to its dual mechanism affecting both serotonin and norepinephrine.
Pristiq is the active metabolite of Effexor (venlafaxine), which means it may have a more predictable response and potentially fewer drug interactions.
How Pristiq Works
Unlike SSRIs that only affect serotonin, Pristiq increases levels of both serotonin and norepinephrine in the brain:
Serotonin Effects
- • Improves mood
- • Reduces anxiety
- • Regulates sleep
Norepinephrine Effects
- • Increases energy
- • Improves concentration
- • Enhances motivation
Treatment Timeline
Week 1-2
Adjustment period with possible nausea, headache, or sleep changes. Some patients notice improved energy early.
Week 2-4
Anxiety and mood improvements become noticeable. Side effects typically decrease.
Week 4-8
Full therapeutic effects achieved. Significant reduction in anxiety and depression symptoms.
Dosing Information
Standard Dosing
Pristiq comes in 25mg, 50mg, and 100mg extended-release tablets. The recommended dose is 50mg once daily, with or without food. Unlike many antidepressants, Pristiq is often effective at the starting dose.
Starting Dose: 50mg daily
Most patients start at therapeutic dose
Maximum Dose: 100mg daily
Higher doses haven't shown additional benefit in studies
Important: Pristiq tablets should be swallowed whole - do not crush, chew, or split them.
Common Side Effects
Nausea
Dizziness
Insomnia
Constipation
Decreased appetite
Increased sweating
Fatigue
Dry mouth
Contact your provider if you experience:
- • Severe headache or elevated blood pressure
- • Unusual bleeding or bruising
- • Signs of serotonin syndrome
- • Worsening depression or suicidal thoughts
Questions About Pristiq?
Our psychiatric team can help you find the right treatment.