What is the LD50 range for substances labeled as 'Caution Poison'?

What is the LD50 range for substances labeled as 'Caution Poison'?

• A. 2500+
• B. 1000 - 2500
• C. 500 - 1000
• D. <500

Answer: (B)

LD50 is the dose that would kill 50% of test animals, so lower LD50 means higher acute toxicity. The label "Caution Poison" sits in a middle-to-higher toxicity range, indicating the substance is clearly toxic but not the most dangerous category. In Alberta’s labeling scheme, substances with an oral LD50 around 1000–2500 mg/kg are classified as “Caution Poison.” That’s why this range is the best fit. If the LD50 were under 500 mg/kg, it would imply much greater toxicity and a harsher label, while LD50 values above about 2500 mg/kg would indicate lower acute toxicity and a less severe label.

LD50 is the dose that would kill 50% of test animals, so lower LD50 means higher acute toxicity. The label "Caution Poison" sits in a middle-to-higher toxicity range, indicating the substance is clearly toxic but not the most dangerous category. In Alberta’s labeling scheme, substances with an oral LD50 around 1000–2500 mg/kg are classified as “Caution Poison.” That’s why this range is the best fit. If the LD50 were under 500 mg/kg, it would imply much greater toxicity and a harsher label, while LD50 values above about 2500 mg/kg would indicate lower acute toxicity and a less severe label.