Get help for serious symptoms
Health Canada's January 2026 guide lists seizures, chest pain, trouble breathing, loss of consciousness, serious speech/understanding problems and serious allergic reactions among medical emergencies. If a cannabis-related medical emergency occurs, call 9-1-1 and tell the operator cannabis was used. Do not assume cannabis is the only possible cause or wait for severe symptoms to pass.
Poison advice after accidental overuse
For accidentally taking cannabis or taking too much, Health Canada lists 1-844-764-7669 (1-844-POISON-X), or 1-800-463-5060 in Quebec. For serious side effects listed on Health Canada's adults-over-55 page, stop using cannabis and contact a health professional. If there is immediate danger, use emergency services rather than waiting on a poison-advice line. If safe, share the product package, route, timing, other substances/medicines and symptoms with responders. Related: cannabis and AFib warning signs.
Questions readers ask
Is chest pain after cannabis always caused by cannabis?
No. The cause cannot be determined from an article. Health Canada identifies chest pain as an emergency symptom in its cannabis guide.
What if someone accidentally took too much?
Health Canada lists 1-844-764-7669 for poison advice, or 1-800-463-5060 in Quebec. Call 9-1-1 for a medical emergency.
Sources
- Health Canada: Information on the use of cannabis for medical purposes (January 2026)
- Health Canada: Adults over 55
Sources checked September 24, 2026.