Though 15mg/kg for acetaminophen are firmly ingrained in your brain, remember that initial and subsequent dosing for the rectal suppository is higher.
Rectal Acetaminophen
Per Birmingham et al in 2001 the “loading” dose of rectal acetaminophen is 40 mg/kg followed by 20 mg/kg doses every 6 h. The risk of significantly high levels or drug accumulation was not seen over a subsequent 24 hour period.
