Levomilnacipran
Generic name: levomilnacipran hydrochloride · Brand name: Fetzima®
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How It Works
Levomilnacipran is a serotonin-norepinephrine reuptake inhibitor (SNRI) that is unique in that it preferentially inhibits norepinephrine reuptake more than serotonin — the opposite ratio of most SNRIs. This stronger norepinephrine effect may make it particularly helpful for patients who struggle with low energy, motivation, and concentration alongside depression. It is FDA-approved specifically for major depressive disorder.
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What It Treats
Major Depressive Disorder (MDD)FDA-approved; particularly helpful when fatigue, low motivation, and concentration are prominent symptoms
Treatment-Resistant DepressionSometimes used when other antidepressants have not been fully effective
FibromyalgiaUsed off-label; norepinephrine action helps with pain modulation
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Dosing Overview
| Population | Start | Typical Range | Max |
|---|---|---|---|
| Adults Depression | 20 mg | 40–120 mg | 120 mg |
| Adults Titration | 20 mg x 2 days | Then 40 mg | 120 mg |
| Renal Impairment Moderate | 40 mg | 80 mg | 80 mg |
Taken once daily with or without food. Start at 20 mg for 2 days, then increase to 40 mg. Capsules should be swallowed whole. Dose may be increased in 40 mg increments every 2+ weeks.
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What to Expect — Timeline
1–2
Weeks 1–2
Body adjusting. May notice changes in sleep, appetite, or mild nausea
3–4
Weeks 3–4
Energy and motivation may begin to improve before full mood lift
6–8
Weeks 6–8
Mood, anxiety, and pain (if applicable) typically improve at therapeutic dose
3–6m
3–6 Months
Full therapeutic benefit. Duration discussed based on your history and goals
⏳ Be patient. Most people need at least 4–8 weeks at a therapeutic dose before evaluating effectiveness. Do not stop without talking to your provider.
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Side Effects
Common (often temporary)
- Nausea
- Increased heart rate (tachycardia)
- Erectile dysfunction
- Hyperhidrosis (sweating)
- Constipation
- Urinary hesitation
- Increased blood pressure
- Dizziness
Call us if you notice
- Worsening depression or anxiety
- New or increased suicidal thoughts
- Significant increase in blood pressure
- Unusual bleeding
- Hypomania or mania-like symptoms
- Serotonin syndrome signs (fever, confusion, tremor)
- Urinary retention (difficulty urinating)
- Significant increase in heart rate
Levomilnacipran has a stronger norepinephrine effect than other SNRIs, which means more norepinephrine-related side effects like increased heart rate, blood pressure, and urinary hesitation. Report any difficulty urinating to your provider promptly.
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Tips for Success
Same Time DailyTake at the same time each day for consistent levels in your system.
With FoodTaking with food reduces nausea, especially in the first weeks.
Don't Stop AbruptlySNRIs can cause discontinuation syndrome. Always taper slowly with your provider.
Limit AlcoholAlcohol worsens depression and anxiety and increases side effects.
Tell All ProvidersLet other prescribers know you take this medication — interactions matter.
Track Your MoodJournaling or a mood app helps you and your provider see what is changing.
Monitor Heart RateFetzima can increase heart rate. Let your provider know if you notice persistent rapid heartbeat.
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Important Safety Information
Black Box Warning (under 25): Antidepressants may increase risk of suicidal thinking in children, adolescents, and young adults, especially in the first few weeks. Monitor closely and contact us right away if new or worsening thoughts of self-harm appear.
Serotonin Syndrome: A rare but serious reaction when combined with MAOIs, triptans, tramadol, or St. John's Wort. Signs include fever, agitation, rapid heart rate, and muscle twitching — seek emergency care immediately.
Drug Interactions: Do not take with MAOIs (must wait 14 days between). Use caution with blood thinners, NSAIDs, and other serotonergic medications. Always share your full medication list.
Blood Pressure: SNRIs can raise blood pressure, especially at higher doses. Your provider may monitor your blood pressure periodically.
Pregnancy & Breastfeeding: Discuss risks and benefits with your provider. Do not stop without consultation.
Discontinuation Syndrome: SNRIs — especially Effexor — can cause significant withdrawal symptoms if stopped abruptly: dizziness, brain zaps, nausea, and flu-like symptoms. Always taper slowly with your provider's guidance.
Urinary Retention: Levomilnacipran can cause difficulty urinating, especially in men. Contact your provider right away if you have trouble urinating or feel like your bladder is not emptying fully.
Increased Heart Rate: Fetzima raises heart rate more than other SNRIs. Your provider may monitor your pulse and blood pressure, especially early in treatment or after dose increases.
Questions? I am here.
Reach me between appointments if you have concerns about side effects, notice mood changes, or have questions about your medication.
360-389-3712
info@rootedmindspsychiatry.com