Long-acting beta-2 agonist (LABA)
Formoterol 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. Formoterol (Formoterol) and cannabis share several pharmacological pathways, and the combination at 80/4.5 mcg, 160/4.5 mcg, 200/6 mcg, 400/12 mcg is not automatically benign even where both are legal.
How cannabis affects Formoterol
THC and other cannabinoids are metabolised partly by hepatic CYP enzymes, including CYP3A4 — the same pathway used by many Long-acting beta-2 agonist (LABA) medications. Frequent cannabis use can shift the metabolism of Formoterol mildly. THC also has cardiovascular effects (increased heart rate, blood pressure changes) and central nervous system effects that can stack with Formoterol's side-effect profile.
Practical guidance
Occasional moderate cannabis use is unlikely to cause clinically meaningful problems for most adults on Formoterol at 80/4.5 mcg, 160/4.5 mcg, 200/6 mcg, 400/12 mcg. 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 Formoterol. 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 Formoterol? ▾
For most adults at 80/4.5 mcg, 160/4.5 mcg, 200/6 mcg, 400/12 mcg, occasional moderate cannabis is tolerated, but heavy daily use is not advised because of metabolic and additive cardiovascular effects with Formoterol. The safe practice is to mention it to the prescriber.
Does CBD interact with Formoterol? ▾
CBD inhibits several CYP enzymes including CYP3A4, which can raise plasma levels of medications that go through that pathway. For Formoterol specifically, this depends on whether Formoterol uses CYP3A4. Daily high-dose CBD products warrant a pharmacist check.
Products containing Formoterol
More on Formoterol
- With alcoholFormoterol and alcohol — is it safe to drink?
- With foodShould Formoterol be taken with food?
- Side effectsFormoterol side effects: common, rare and warning signs
- Dosage guideFormoterol dosage guide: how much to take and when
- OnsetHow fast does Formoterol start working?
- DurationHow long does Formoterol last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.