Analgesics, Non-Narcotic analgesic agent 8 Acetaminophen 5 Humans 5 controlled study 5 human 5 male 5 paracetamol 5 Analgesics 4 Animals 4 Article 4 Male 4 Plant Extracts 4 Plant Leaves 4 adult 4 animal 4 animal experiment 4 nonhuman 4 pain 4 plant extract 4 plant leaf 4 Adult 3 Mice 3 animal model 3 antinociception 3 antinociceptive agent 3 chemistry 3 isolation and purification 3 mouse 3 unclassified drug 3