Review acetaminophen overdose dose severity, Rumack-Matthew nomogram thresholds, and liver-injury context in one worksheet.
The Tylenol Overdose Calculator is an acetaminophen overdose worksheet that brings together dose-per-kilogram context, Rumack-Matthew nomogram thresholds, and basic liver-injury context. Acetaminophen overdose is a major cause of acute liver failure, so the value of a page like this is not to replace Poison Control or emergency evaluation, but to help organize the key numbers that are often reviewed early.
The Rumack-Matthew nomogram is the classic reference for acute single-ingestion assessment. It plots serum acetaminophen concentration against time since ingestion and shows whether the entered level sits above or below the 150 µg/mL reference line. However, the nomogram has important limits: it is not valid for repeated supratherapeutic ingestion, unknown timing, most extended-release scenarios, or levels drawn before 4 hours.
This calculator therefore works best as a timing-and-dose worksheet. It is not a stand-alone toxicology workflow or treatment protocol.
Acetaminophen overdose review usually turns on a few linked numbers: how much was taken, when it was taken, and where the serum level sits relative to the nomogram. This calculator keeps those numbers together so the page works as a quick worksheet during a toxicology review.
Dose worksheet trigger: ≥150 mg/kg (acute single ingestion) Rumack-Matthew reference line: 150 µg/mL at 4 hours → about 4.7 µg/mL at 24 hours (semi-logarithmic) Nomogram use setting: acute single ingestion, known time, 4–24 hour level
Result: 200 mg/kg — above common worksheet trigger; serum 180 µg/mL is above the 4-hour reference line
A 70 kg patient ingesting 14,000 mg (14 g) of acetaminophen equals 200 mg/kg, which is above the classic 150 mg/kg worksheet trigger. At 4 hours post-ingestion, a serum level of 180 µg/mL also sits above the 150-line reference value of 150 µg/mL.
The Rumack-Matthew nomogram gave clinicians an objective frame for acute acetaminophen overdose review. In practice, the 150-line is commonly used as a reference line in many systems.
The nomogram is a timing-specific tool. Delayed absorption, extended-release products, unknown time of ingestion, and repeated supratherapeutic exposure all make a simple point-on-the-line interpretation much less reliable.
This page is most useful for organizing dose, timing, and serum-level context before or during a real toxicology discussion. It should not be treated as a stand-alone antidote or decontamination protocol.
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This worksheet organizes acute acetaminophen ingestion timing, dose-per-kg context, and Rumack-Matthew reference thresholds. It is a review aid, not a treatment protocol.
It is a graph plotting serum acetaminophen concentration versus time after a known acute single ingestion. This page uses the 150-line as reference context, not as a substitute for toxicology review.
It is not designed for repeated supratherapeutic ingestion, unknown timing, most extended-release scenarios, or very early levels drawn before 4 hours.
For acute single ingestion, ≥150 mg/kg is the classic worksheet trigger for possible toxicity. Higher doses raise concern, but the full picture still depends on timing, labs, and toxicology review.
No. It shows dose and timing context only. Treatment decisions belong in a live poison-center, toxicology, or emergency-care pathway.
Acetaminophen absorption usually peaks within about 1 to 4 hours for immediate-release products. Earlier levels can look falsely reassuring.