Serotonin-norepinephrine reuptake inhibitor (SNRI)
Venlafaxine 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. Venlafaxine (Venlafaxine) and cannabis share several pharmacological pathways, and the combination at 37.5mg, 75mg, 150mg is not automatically benign even where both are legal.
How cannabis affects Venlafaxine
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 Venlafaxine mildly. THC also has cardiovascular effects (increased heart rate, blood pressure changes) and central nervous system effects that can stack with Venlafaxine's side-effect profile.
Practical guidance
Occasional moderate cannabis use is unlikely to cause clinically meaningful problems for most adults on Venlafaxine at 37.5mg, 75mg, 150mg. 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 Venlafaxine. 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 Venlafaxine? ▾
For most adults at 37.5mg, 75mg, 150mg, occasional moderate cannabis is tolerated, but heavy daily use is not advised because of metabolic and additive cardiovascular effects with Venlafaxine. The safe practice is to mention it to the prescriber.
Does CBD interact with Venlafaxine? ▾
CBD inhibits several CYP enzymes including CYP3A4, which can raise plasma levels of medications that go through that pathway. For Venlafaxine specifically, this depends on whether Venlafaxine uses CYP3A4. Daily high-dose CBD products warrant a pharmacist check.
Products containing Venlafaxine
More on Venlafaxine
- With alcoholVenlafaxine and alcohol — is it safe to drink?
- With foodShould Venlafaxine be taken with food?
- Side effectsVenlafaxine side effects: common, rare and warning signs
- Dosage guideVenlafaxine dosage guide: how much to take and when
- OnsetHow fast does Venlafaxine start working?
- DurationHow long does Venlafaxine last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.