Antiepileptic (sodium channel blocker)
Lamotrigine and CBD — interaction profile and FAQ
Cannabidiol (CBD) is widely used as an over-the-counter wellness product, and many people taking Lamotrigine (Lamotrigine) — used for Lamotrigine is approved in adults and children aged 2 years and older as adjunctive or monotherapy for partial-onset seizures, primary generalised tonic-clonic seizures and seizures associated with Le… — wonder whether the two are safe to combine. Unlike most herbal products, CBD has documented interactions with several drug-metabolising enzymes, which means it can change blood levels of co-administered medications. Below is a focused look at the Lamotrigine-and-CBD question at the 25mg, 50mg, 100mg, 200mg dosing strengths.
How CBD can affect Lamotrigine blood levels
CBD inhibits several cytochrome P450 enzymes — most notably CYP3A4, CYP2C19 and CYP2D6 — which together metabolise a large fraction of prescription medications. Lamotrigine, with active ingredient Lamotrigine, may or may not be metabolised by these enzymes; if it is, concomitant CBD can raise Lamotrigine blood levels and increase the risk of dose-related side effects. Conversely, in some pathways, induction or competition for transporters can lower exposure. The clinically relevant size of this effect depends on the CBD dose, formulation and individual hepatic metabolism.
Practical guidance for combined use
According to general clinical guidance, anyone planning to combine Lamotrigine at the 25mg, 50mg, 100mg, 200mg doses with regular CBD use should discuss this with the prescriber and ideally check the Lamotrigine prescribing information and an interaction database (e.g. Lexicomp, the FDA Drug Interactions guidance) for the Lamotrigine entry. Practical steps include starting at low CBD doses, separating CBD and Lamotrigine doses by several hours where feasible and monitoring for side effects (sedation, dizziness, gastrointestinal symptoms or laboratory changes) during the first weeks. Pure isolate CBD has fewer co-formulants but the CYP-inhibition signal is similar.
Frequently asked questions
Is it safe to use CBD with Lamotrigine? ▾
Whether CBD is safe to combine with Lamotrigine depends on the metabolic pathway of Lamotrigine, the CBD dose and the indication for which Lamotrigine is taken at the 25mg, 50mg, 100mg, 200mg dose. For many medications the interaction is mild and manageable; for narrow-therapeutic-index drugs (anticoagulants, anti-epileptics, immunosuppressants and some psychiatric medications) the combination warrants closer follow-up. Discuss with the prescriber and check an interaction database before starting CBD.
How much time should I leave between CBD and Lamotrigine? ▾
For most medications, separating CBD and Lamotrigine by several hours reduces, though does not eliminate, the metabolic interaction; for steady-state regimens with cumulative drug levels, simple time separation has limited effect. According to general pharmacological principles, the more meaningful step is establishing a stable CBD dose, monitoring symptoms and laboratory values, and adjusting Lamotrigine dosing under the prescriber's guidance rather than relying on timing alone.
Products containing Lamotrigine
More on Lamotrigine
- With alcoholLamotrigine and alcohol — is it safe to drink?
- With foodShould Lamotrigine be taken with food?
- Side effectsLamotrigine side effects: common, rare and warning signs
- Dosage guideLamotrigine dosage guide: how much to take and when
- OnsetHow fast does Lamotrigine start working?
- DurationHow long does Lamotrigine last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.