Last updated: 23 September 2026. This is a reference summary, not a substitute for checking with a doctor or pharmacist about your specific medications. Not medical advice.
This page consolidates CBD’s known and plausible medication interactions into a single reference table. Each row links to a full, dedicated guide covering the specific mechanism, practical guidance, and what to watch for. Use this page to quickly identify whether your medication category has a relevant interaction, then read the linked guide for detail.
Medication interaction quick reference
| Medication category | Examples | Concern level | Full guide |
|---|---|---|---|
| Blood thinners (warfarin) | Warfarin | High, well documented | CBD and Warfarin |
| Immunosuppressants | Tacrolimus, cyclosporine | High | Hemp and Drug Interactions overview |
| Lithium | Lithium carbonate | High, narrow therapeutic window | CBD and Lithium |
| Seizure medications | Clobazam, valproate | Moderate to high, well documented | CBD and Seizure Medications |
| Chemotherapy drugs | Varies by regimen | High, requires oncology guidance | CBD and Chemotherapy Drugs |
| Sleep aids | Zolpidem (Ambien) | Moderate to high | CBD and Sleep Aids Like Ambien |
| Muscle relaxants | Cyclobenzaprine, baclofen | Moderate | CBD and Muscle Relaxants |
| SSRIs | Sertraline, fluoxetine | Moderate | CBD and Antidepressants (SSRIs) |
| Statins | Atorvastatin, simvastatin | Low to moderate, varies by statin | CBD and Statins |
| Blood pressure medications / beta blockers | Lisinopril, propranolol, metoprolol | Low to moderate | CBD and Blood Pressure Medications / CBD and Beta Blockers |
| Antibiotics | Varies by class | Low to moderate, class-dependent | CBD and Antibiotics |
| Hormonal birth control | Combined and progestin-only pills | Low to moderate | CBD and Birth Control |
| Metformin | Metformin | Low, kidney-cleared | CBD and Metformin |
| NSAIDs | Ibuprofen, naproxen | Low, occasional use | CBD and NSAIDs |
| Omega-3 / fish oil | Fish oil supplements | Low | CBD and Omega-3 |
| Antihistamines | Diphenhydramine, cetirizine | Low, sedation-dependent | CBD and Antihistamines |
The single mechanism behind most of these
The majority of interactions above trace back to one shared pathway: CYP3A4, a liver enzyme responsible for metabolizing roughly half of all prescription medications. CBD inhibits this enzyme, which can slow clearance of any medication that relies on it, potentially raising blood levels beyond what the prescribed dose intends. A useful, though imperfect, screening shortcut: if your medication carries a “avoid grapefruit juice” warning, it likely shares this pathway. See our full explanation of the grapefruit comparison for more detail.
What “concern level” means in this table
- High. Documented interaction, narrow safety margin on the medication side, or serious consequence if the interaction occurs. Requires direct specialist involvement before combining.
- Moderate. Plausible or partially documented interaction; manageable with physician awareness and monitoring, but not something to combine without disclosure.
- Low. Generally lower risk for occasional or typical use, but still worth mentioning to a doctor or pharmacist, particularly with regular use or multiple medications.
What this page doesn’t cover
This is not an exhaustive list of every possible medication CBD could theoretically interact with, and it’s not a substitute for a pharmacist-run interaction check against your complete, specific medication list. If your medication isn’t listed here, that doesn’t confirm it’s interaction-free, it may simply not be covered in our current guides. When in doubt, ask a pharmacist directly.
Frequently asked questions
How do I check if my specific medication interacts with CBD?
Find your medication’s category in the table above and read the linked detailed guide. If your medication isn’t listed, ask your pharmacist directly, they can check your specific medication against known interaction databases.
Is this list complete?
No, it covers the medication categories we’ve researched in depth. Absence from this list doesn’t mean a medication is interaction-free.
What’s the most reliable single screening method?
Checking whether your medication carries a grapefruit juice warning is a reasonably good proxy, since it shares the same CYP3A4 mechanism as most CBD interactions, though it isn’t a complete substitute for a full pharmacist check.
