Pharmacokinetics and repeated dose 28‐day oral toxicity studies of acetaminophen nanosuspension

Wide availability and easy accessibility of acetaminophen oral dosage forms increase the risk of intentional poisoning or unintentional organ toxicity, leading to a wide range of liver failure, nephrotoxicity, and neurotoxicity. In this study, an attempt was made to improve oral bioavailability and reduce the toxicity of acetaminophen using nanosuspension technology. The acetaminophen nanosuspensions (APAP‐NSs) were prepared by a nano‐precipitation method using polyvinyl alcohol and hydroxypropylmethylcellulose as stabilizers. The mean diameter of APAP‐NSs was 124 ± 3.8 nm. The dissolution profile of APAP‐NSs was significantly point‐to‐point higher than the coarse drug in simulated gastrointestinal fluids. The in vivo study revealed 1.6‐ and 2.8‐fold increases in the AUC 0‐inf and C max of the drug, respectively, in APAP‐NSs‐receiving animals compared to the control group. Moreover, no deaths and no abnormalities in clinical signs, body weights, and necropsy findings were detected in the dose groups up to 100 mg/kg of the 28‐day repeated oral dose toxicity study in mice.