Does cannabis interact with benzodiazepines?
Yes. Cannabis can interact with benzodiazepines. The main risk is added central nervous system depression. Both drug classes can cause sedation, dizziness, slowed reaction time, and impaired coordination. Combined use can increase these effects. Some cannabis compounds also change liver enzymes that break down benzodiazepines. That can raise benzodiazepine blood levels. The size of the risk depends on dose, route, timing, THC and CBD content, and the specific benzodiazepine.
cbd and medication interactions
Evidence is limited. Case reports and small studies show harm. Large controlled trials are few. Federal rules limit cannabis research in the US.
What is the main safety risk?
Added sedation is the main safety risk. Signs include extreme drowsiness, confusion, slurred speech, an unsteady walk, and slow breathing. Seek emergency help for slow or shallow breathing, blue lips, fainting, or a person who cannot be woken. In the US, call 911. Poison control is 1-800-222-1222.
How does cannabis change benzodiazepine levels?
CBD inhibits CYP3A4 and CYP2C19. Many benzodiazepines use these enzymes. Examples include alprazolam, midazolam, triazolam, diazepam, and clobazam. CBD can raise blood levels of these drugs. THC has less effect on these enzymes, but THC adds sedation. Convenience formats such as gummies, vapes, and tinctures can make dose tracking harder. Labels may not match actual cannabinoid amounts.
Which benzodiazepines are involved?
All benzodiazepines can add to cannabis sedation. Enzyme effects differ. Alprazolam, midazolam, and triazolam rely on CYP3A4. Diazepam and clobazam rely on CYP2C19 and CYP3A4. Lorazepam and oxazepam rely less on these enzymes. They still add sedation and coordination problems.
What raises the risk?
- High THC dose
- High CBD dose
- Alcohol or opioid use
- Older age
- Liver disease
- Sleep apnea
- A new dose or a new product
What should a patient do?
Tell the prescriber about cannabis use, including CBD. Do not stop a benzodiazepine without medical advice. Withdrawal can cause seizures. Ask about dose changes and drug tests. Avoid driving after combined use. Keep cannabis and benzodiazepines out of reach of children.
What is the evidence gap?
No large US trials have tested this mix. Most data come from surveys, case reports, and enzyme studies. The FDA has not approved whole-plant cannabis for medical use. Clinicians need better data on dose, product type, and patient risk.