Supplement stacks / Duloxetine + St Johns Wort
Can You Take Duloxetine with St Johns Wort?
Duloxetine and St Johns Wort: one interaction flagged, scored 3/10 (high risk). The count and score come from an AI-written analysis checked against our interaction rules, which can only make it stricter. Not medical advice.
Safety at a glance
This score comes from an AI-written analysis of the pair. Our interaction rules check it and can only make it stricter, never milder. Informational only: it can't account for your medications, conditions, or genetics.
What the AI-written analysis says
Duloxetine is an antidepressant that can interact with St. John's Wort, a herbal supplement often used for depression. The combination may increase the risk of serotonin syndrome, a potentially serious condition. Caution is advised, and consultation with a healthcare provider is essential before combining these substances.
Duloxetine is a prescription medication. This page describes publicly documented interactions — it can't see your dose, your other prescriptions, or your labs. Discuss any supplement with the prescriber or pharmacist who manages this medication before combining.
Known interactions
Increased risk of serotonin syndrome.
Duloxetine
From the AI-written analysis.
Generally well-tolerated; monitor for side effects.
Typical dosage: As prescribed or as directed on the label
- nausea
- dry mouth
- fatigue
- dizziness
- Monitor for signs of serotonin syndrome when combined with other serotonergic agents.
St John's Wort
From the AI-written analysis.
Generally safe but can interact with many medications.
Typical dosage: 300-900 mg daily
- gastrointestinal upset
- fatigue
- dry mouth
- May reduce the effectiveness of other medications, including antidepressants.
Also commonly mentioned
These come up in questions about this combination. They are not part of the pair above. From the AI-written analysis.
Omega-3 Fatty Acids
Generally safe; may support mood.
Typical dosage: 1000-3000 mg daily
- fishy aftertaste
- gastrointestinal discomfort
- Monitor for bleeding risk if on anticoagulants.
Magnesium
Generally safe; may help with anxiety and mood.
Typical dosage: 200-400 mg daily
- diarrhea
- nausea
- Excessive intake can lead to gastrointestinal issues.
L-Theanine
Generally safe; may promote relaxation.
Typical dosage: 100-400 mg daily
- headache
- dizziness
- Consult healthcare provider if on other medications.
Timing
No timing arrangement makes this combination safe — see the warnings above.
Recommendations
- Consult with a healthcare provider before combining duloxetine with St. John's Wort.
- Consider omega-3 fatty acids or magnesium as alternatives for mood support.
Watch out for
- Combining two or more serotonergic substances can raise the risk of serotonin syndrome, a potentially serious reaction. Do not combine them without medical supervision, and seek care for agitation, confusion, tremor, sweating, rapid heartbeat, or high fever.
- Do not combine duloxetine with St. John's Wort without medical supervision.
Frequently asked questions
Can you take Duloxetine and St Johns Wort together?
Duloxetine and St Johns Wort: one interaction flagged, scored 3/10 (high risk). The count and score come from an AI-written analysis checked against our interaction rules, which can only make it stricter. Not medical advice.
What score does the Duloxetine and St Johns Wort combination get?
The Duloxetine and St Johns Wort combination is scored 3/10 (high risk). The score comes from an AI-written analysis checked against our interaction rules, which can only make it stricter. Not medical advice. Always confirm with a healthcare professional.
When should you take Duloxetine and St Johns Wort?
No timing arrangement makes this combination safe — see the warnings above.
What should you watch out for when combining Duloxetine and St Johns Wort?
Combining two or more serotonergic substances can raise the risk of serotonin syndrome, a potentially serious reaction. Do not combine them without medical supervision, and seek care for agitation, confusion, tremor, sweating, rapid heartbeat, or high fever. Do not combine duloxetine with St. John's Wort without medical supervision.
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Not medical advice
AI-written analysis generated August 11, 2026, checked by our interaction rules · How our analysis works