Medications · Supplements
CBD Before Surgery
CBD is sold as a wellness product, but around surgery it's not as neutral as it seems — it can interfere with how your body handles anesthetic drugs, and the products themselves are inconsistent. Tell your anesthetist, and stop it in good time.
The short answer
Why CBD matters before surgery
CBD affects the same liver enzymes that break down many medicines, so it can change how your anesthetic and pain relief behave. On top of that, CBD products are poorly regulated — the actual strength can differ from the label, and some contain traces of THC — so your team can't predict its effect unless they know you take it. Higher doses may also have a mild effect on bleeding.
What to do
Tell your anesthetist exactly what you take and how much, and stop it in the days before surgery as they advise. If you use CBD for pain or anxiety, ask about alternatives for the run-up. For cannabis itself (smoked or edible), see the cannabis before surgery guide.
Frequently asked questions
How long before surgery should I stop CBD?
Many teams advise stopping CBD several days before surgery, and disclosing it. Because products vary so much in strength and what they actually contain, there's no single official number — so ask your anesthetist for specific guidance and stop in good time.
Why does CBD matter for anesthesia?
CBD can affect the liver enzymes that break down many anesthetic and pain medicines, which may change how those drugs work. Some CBD products also contain traces of THC, and high doses may have mild effects on bleeding. Your anesthetist needs the full picture to dose your anesthetic safely.
Do I need to mention CBD if it's just a wellness product?
Yes. People often leave CBD off their medicine list because it's sold as a supplement, but it interacts with anesthesia and the products are unregulated. Disclosing it is genuinely useful medical information, and it stays part of your confidential care.