No confirmed fatal overdose from CBD alone has been reported in humans. CBD has no established lethal dose. Taking too much can still cause side effects. US product labels can list doses that do not match lab tests.
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What overdose means for CBD
An overdose is a dose that causes harm. For CBD, harm ranges from sleepiness and nausea to liver injury. Fatal overdose is a separate question. Animal studies use doses above human serving sizes and report no death from CBD alone. Human trials of the prescription CBD drug Epidiolex used doses up to 20 mg/kg per day. That is about 1,400 mg for a 70 kg adult. Trials reported side effects, not deaths.
Side effects at high doses
- Sleepiness
- Nausea
- Diarrhea
- Changes in appetite
- Liver enzyme rises
- Drug interactions
The FDA lists liver injury, drug interactions, and drowsiness as CBD risks. CBD can raise blood levels of some drugs. Warfarin and clobazam are examples. FDA lab tests found some CBD products with THC and with CBD content that did not match labels.
Why convenience raises risk
Ready-to-drink beverages, gummies, and vape pens make repeated dosing easy. A 16 oz bottle can hold 2 or more servings. A person can take 2 servings without noticing. That is not a fatal overdose, but it can cause side effects and drug interactions. A product with THC adds impairment risk.
When to call Poison Control
Call Poison Control at 1-800-222-1222 after a large CBD dose, for a child. Signs include vomiting, sleepiness, and trouble staying awake. For liver pain, dark urine, or yellow skin, seek medical care.
Bottom line
CBD alone has no reported fatal overdose. Too much CBD can cause harm. Check lab tests. Start with a low dose. Account for THC.