What is phase 1 of acetaminophen toxicity/poisoning?

Updated: Jan 17, 2020
  • Author: Susan E Farrell, MD; Chief Editor: Michael A Miller, MD  more...
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In phase 1 (0.5-24 hours after ingestion), patients may be asymptomatic or report anorexia, nausea or vomiting, and malaise. Physical examination may reveal pallor, diaphoresis, malaise, and fatigue. It is during this phase, if the ingestion is unknown, that patients may be given an APAP-containing medication to alleviate their nonspecific symptoms.

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