Lantus and CBD — interaction profile and FAQ
Cannabidiol (CBD) is widely used as an over-the-counter wellness product, and many people taking Lantus (Insulin Glargine) — used for The medication is indicated in adults and paediatric patients with type 1 diabetes mellitus, and in adults with type 2 diabetes mellitus when basal insulin is required. — 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 Lantus-and-CBD question at the 100 IU/mL dosing strengths.
How CBD can affect Lantus blood levels
CBD inhibits several cytochrome P450 enzymes — most notably CYP3A4, CYP2C19 and CYP2D6 — which together metabolise a large fraction of prescription medications. Lantus, with active ingredient Insulin Glargine, may or may not be metabolised by these enzymes; if it is, concomitant CBD can raise Lantus 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 Lantus at the 100 IU/mL doses with regular CBD use should discuss this with the prescriber and ideally check the Lantus prescribing information and an interaction database (e.g. Lexicomp, the FDA Drug Interactions guidance) for the Insulin Glargine entry. Practical steps include starting at low CBD doses, separating CBD and Lantus 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 Lantus? ▾
Whether CBD is safe to combine with Lantus depends on the metabolic pathway of Insulin Glargine, the CBD dose and the indication for which Lantus is taken at the 100 IU/mL 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 Lantus? ▾
For most medications, separating CBD and Lantus 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 Lantus dosing under the prescriber's guidance rather than relying on timing alone.
More on Lantus
- With alcoholLantus and alcohol — is it safe to drink?
- With foodShould Lantus be taken with food?
- Side effectsLantus side effects: common, rare and warning signs
- Dosage guideLantus dosage guide: how much to take and when
- OnsetHow fast does Lantus start working?
- DurationHow long does Lantus last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.