Serotonin-norepinephrine reuptake inhibitor (SNRI)
Duloxetine drug interactions: a practical overview
Drug interactions are the single biggest cause of preventable medication problems. Duloxetine (Duloxetine) interacts to varying degrees with several classes of medication and with a smaller list of foods. This page summarises the practically important ones at 20mg, 30mg, 60mg, framed for a real-world prescription review rather than an exhaustive PDF list.
High-priority interactions for Duloxetine
For Duloxetine, the most clinically relevant interactions are typically with strong CYP3A4 inhibitors and inducers, with cardiovascular medications (notably nitrates for several Serotonin-norepinephrine reuptake inhibitor (SNRI) agents), with central nervous system depressants, and with medications affecting blood pressure or heart rate. Duloxetine inhibits the reuptake of both serotonin and norepinephrine at the synapse, with weaker effect on dopamine.
Working with the pharmacist
A pharmacist review of all current medications is the practical safeguard against unintended interactions with Duloxetine. According to the prescribing information for Duloxetine, the full medication list — prescription, OTC, supplements and recreational substances — should be reviewed before starting and at every dose change at 20mg, 30mg, 60mg.
Frequently asked questions
What's the most important Duloxetine interaction to know? ▾
For most Serotonin-norepinephrine reuptake inhibitor (SNRI) medications, the highest-priority interaction is with nitrate medications used for chest pain — this combination is often a hard contraindication. After that, strong CYP3A4 inhibitors (some antifungals, macrolides) are the next concern at routine 20mg, 30mg, 60mg doses.
Do I need to tell the pharmacist about supplements? ▾
Yes. Supplements and herbal products can interact with Duloxetine in ways that prescription drug-drug interaction databases miss. The pharmacist needs the complete picture — including supplements like St John's Wort, grapefruit-containing products and high-dose vitamins — to flag risks at 20mg, 30mg, 60mg.
Products containing Duloxetine
More on Duloxetine
- With alcoholDuloxetine and alcohol — is it safe to drink?
- With foodShould Duloxetine be taken with food?
- Side effectsDuloxetine side effects: common, rare and warning signs
- Dosage guideDuloxetine dosage guide: how much to take and when
- OnsetHow fast does Duloxetine start working?
- DurationHow long does Duloxetine last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.