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Aspirin poisoning

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

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Aspirin is the most common salicylate in regular use and poisoning is common. In adults, moderate to severe toxicity may occur after taking 50 x 300 mg tablets.

Salicylates may also be found in:

  • oil of wintergreen - contains methylsalicylate; this is particularly toxic by mouth as it is rapidly absorbed; 1 teaspoonful is equivalent to 12 x 300 mg tablets of aspirin
  • various keratolytic agents eg. salicylic acid

Normally aspirin is rapidly absorbed from the stomach and the small intestine but in large doses, clearance and absorption may be slowed as the tablets adhere to form a large bolus. Blood salicylate levels may continue to rise for up to 24 hours after a massive overdose.

Toxicity occurs above 250 mg per litre.


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The content herein is provided for informational purposes and does not replace the need to apply professional clinical judgement when diagnosing or treating any medical condition. A licensed medical practitioner should be consulted for diagnosis and treatment of any and all medical conditions.

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