Acetaminophen Overdose Nursing Management and Interventions

The drug looks harmless because it sits on every shelf, and that is exactly why it kills. Acetaminophen overdose damages the liver, and the patient often looks fine for the first day before liver failure declares itself. Get the level, plot it against time, and give the antidote early. Do not wait for symptoms.

Definition

Acetaminophen poisoning is an overdose of the over-the-counter pain medication acetaminophen (Tylenol, Biogesic), which is safe at recommended doses. The maximum daily dose is 4 grams. Patients with chronic disease, especially liver disease, may need to stay under 3 grams a day. Toxicity comes from one large dose or from chronic overdosing.

Causes

Intentional overdose (suicide attempt). Accidental overdose in unsupervised children or from poor judgment about safe intake. Combining products that each contain acetaminophen, which hides in more combination drugs than anything else (acetaminophen with codeine, acetaminophen with aspirin). Patients in liver failure can reach toxic levels even on recommended doses.

Risk Factors

Age 15 to 24, or older than 40 (the over-40 group is more likely to have severe effects). Female sex. Suicidal behavior.

Symptoms

Early: nausea, vomiting, excessive sweating, pale skin. These are nonspecific and easy to dismiss.

Liver failure follows: anorexia, nausea, vomiting, malaise, right upper quadrant abdominal pain, pale skin, excessive sweating, jaundice, confusion, and stupor.

Diagnosis

Blood tests measure the acetaminophen level and assess liver function (liver enzymes, coagulation studies).

The Rumack-Matthew nomogram plots the blood acetaminophen level against time since ingestion to gauge the threat to the liver. Time of ingestion drives everything, so pin it down.

Treatment

Monitoring. Children with relatively low blood levels may be watched at home.

Activated charcoal. Given by mouth to block acetaminophen absorption in the GI tract.

N-acetylcysteine. The antidote. Give it by mouth or IV in most toxic overdoses. It works best given early, so do not stall waiting for liver enzymes to climb.