8 HOUR PAIN RELIEF (acetaminophen)

There are 3 contraindications. Absolute contraindication.

Contraindication List
Acetaminophen overdose
Acute hepatic failure
Acute hepatitis C

There are 3 severe contraindications. Adequate patient monitoring is recommended for safer drug use.

Severe List
Disease of liver
Protein-calorie malnutrition
Shock

There are 0 moderate contraindications.

There are 14 severe adverse reactions.

More Frequent	Less Frequent
None.	Abnormal hepatic function tests

Rare/Very Rare
Acute generalized exanthematous pustulosis Acute hepatic failure Agranulocytosis Allergic dermatitis Angioedema Drug-induced hepatitis Laryngeal edema Leukopenia Maculopapular rash Neutropenic disorder Stevens-johnson syndrome Thrombocytopenic disorder Toxic epidermal necrolysis

There are 4 less severe adverse reactions.

More Frequent	Less Frequent
None.	None.

Rare/Very Rare
Erythema Medication overuse headache Skin rash Urticaria

Epidemiologic data regarding oral acetaminophen use in pregnant women have shown no increased risk of major congenital malformations in infants exposed in utero to the drug. In a large population-based prospective cohort study involving more than 26,000 women with live-born singleton infants who were exposed to oral acetaminophen during the first trimester of pregnancy, no increase in the risk of congenital malformations was observed in exposed children compared with a control group of unexposed children; the rate of congenital malformations (4.3%) was similar to the rate in the general population. A population-based, case-control study from the National Birth Defects Prevention Study also found no increase in the risk of major birth defects in a group of 11,610 children who had been exposed to acetaminophen during the first trimester of pregnancy compared with a control group of 4500 children.

Animal reproduction studies in pregnant rats given oral acetaminophen during organogenesis at dosages up to 0.85 times the maximum recommended human daily dosage (4 g daily, based on body surface area comparison) showed evidence of fetotoxicity (reduced fetal weight and length) and a dose-related increase in bone variations (reduced ossification and rudimentary rib changes); the offspring showed no evidence of external, visceral, or skeletal malformations. When pregnant rats received oral acetaminophen throughout gestation at a dosage of 1.2

times the maximum recommended human daily dosage, areas of necrosis occurred in both the liver and kidney of pregnant rats and fetuses; these effects did not occur in animals given acetaminophen at dosages of 0.3 times the maximum recommended human dosage. In a continuous breeding study in which pregnant mice were given acetaminophen at dosages approximately equivalent to 0.43,

0.87, or 1.7 times the maximum recommended human daily dosage (based on body surface area comparison), a dose-related reduction in body weight of the fourth and fifth litter offspring of the treated mating pair occurred during lactation and following weaning at all dosages studied.

Animals receiving the highest dosage had a reduced number of litters per mating pair, male offspring with an increased percentage of abnormal sperm, and reduced birth weights in the next-generation pups. Acetaminophen is commonly used during all stages of pregnancy for its analgesic and antipyretic effects. Although acetaminophen has been thought not to be associated with risk in offspring, some recent reports have questioned this assessment, especially with frequent maternal use or in cases involving genetic variability.

FDA reviewed data on a possible association between acetaminophen use during pregnancy and risk of attention deficit hyperactivity disorder (ADHD) in children and announced in January 2015 that the data were inconclusive. Some experts state that as with all drug use during pregnancy, routine use of acetaminophen should be avoided. The manufacturer states that there are no studies of IV acetaminophen in pregnant women and animal reproduction studies have not been conducted with this preparation.

Therefore, the manufacturer states that IV acetaminophen should be used during pregnancy only when clearly needed. Because there are no adequate and well-controlled studies of IV acetaminophen during labor and delivery, the manufacturer states that IV acetaminophen should be used in this setting only after careful assessment of potential benefits and risks.

Acetaminophen is distributed into human milk in small quantities after oral administration. Data from more than 15 nursing women suggest that approximately 1-2% of the maternal daily dosage would be ingested by a nursing infant. A case of maculopapular rash in a breast-fed infant has been reported; the rash resolved when the mother discontinued acetaminophen use and recurred when she resumed acetaminophen therapy.

The American Academy of Pediatrics and other experts state that acetaminophen is an acceptable choice for use in nursing women. The manufacturer states that IV acetaminophen should be used with caution in nursing women.

No enhanced Geriatric Use information available for this drug.