Serotonin-norepinephrine reuptake inhibitor (SNRI)
Duloxetine and cannabis (marijuana, THC)
As cannabis becomes legal or decriminalised in more jurisdictions, the practical question of combining it with prescription medication comes up regularly. Duloxetine (Duloxetine) and cannabis share several pharmacological pathways, and the combination at 20mg, 30mg, 60mg is not automatically benign even where both are legal.
How cannabis affects Duloxetine
THC and other cannabinoids are metabolised partly by hepatic CYP enzymes, including CYP3A4 — the same pathway used by many Serotonin-norepinephrine reuptake inhibitor (SNRI) medications. Frequent cannabis use can shift the metabolism of Duloxetine mildly. THC also has cardiovascular effects (increased heart rate, blood pressure changes) and central nervous system effects that can stack with Duloxetine's side-effect profile.
Practical guidance
Occasional moderate cannabis use is unlikely to cause clinically meaningful problems for most adults on Duloxetine at 20mg, 30mg, 60mg. Heavy daily use, edibles with high THC content, or cannabis combined with alcohol substantially raise the risk of dizziness, hypotension, impaired judgement and amplified side effects from Duloxetine. According to the prescribing information, the full list of recreational substances should be disclosed to the prescriber.
Frequently asked questions
Can I use cannabis while taking Duloxetine? ▾
For most adults at 20mg, 30mg, 60mg, occasional moderate cannabis is tolerated, but heavy daily use is not advised because of metabolic and additive cardiovascular effects with Duloxetine. The safe practice is to mention it to the prescriber.
Does CBD interact with Duloxetine? ▾
CBD inhibits several CYP enzymes including CYP3A4, which can raise plasma levels of medications that go through that pathway. For Duloxetine specifically, this depends on whether Duloxetine uses CYP3A4. Daily high-dose CBD products warrant a pharmacist check.
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.