title: Evaluation of antinociceptive activity of hydromethanol extract of Cyperus rotundus in mice.
abstract: BACKGROUND
  Cyperus rotundus Linn. (Cyperaceae) is used to treat inflammation, pain, fever, wounds, boils and blisters in folk medicine. This study evaluated the antinociceptive effect of the hydromethanol extract of whole plant of C. rotundus (HMCR).
  
  
  METHODS
  The antinociceptive activity of HMCR was investigated in thermal-induced (hot plate and tail immersion) and chemical-induced (formalin) nociception models in mice at three different doses (50, 100 and 200 mg/kg; p.o.). Morphine sulphate (5 mg/kg, i.p.) and diclofenac sodium (10 mg/kg, i.p.) were used as reference analgesic agents.
  
  
  RESULTS
  In the hot-plate and tail-immersion tests HMCR significantly increased the latency period to the thermal stimuli at all the tested doses (50, 100 and 200 mg/kg) (p < 0.05). The significant increase in latency is clear from the observations at 60 and 90 min. In formalin-induced paw licking test oral administration of HMCR at 100 and 200 mg/kg doses decreased the licking of paw in early phase. All the tested doses (50, 100 and 200 mg/kg) significantly decreased the licking of paw in late phase of the test (p < 0.001). The dose 200 mg/kg was most effective showing maximum percentage of inhibition of licking in both early (61.60%) and late phase (87.41%).
  
  
  CONCLUSIONS
  These results indicate the antinociceptive effect of C. rotundus and suggest that this effect is mediated by both peripheral and central mechanisms. These results support the traditional use of this plant in different painful conditions.
authors.affiliation: Department of Pharmacy, Stamford University Bangladesh, 51 Siddeswari Road, Dhaka 1217, Bangladesh. zafarimam@gmail.com.
authors.forename: Mohammad Zafar
authors.initials: MZ
authors.lastname: Imam
authors.forename: Chandra Datta
authors.initials: CD
authors.lastname: Sumi
mesh_terms: D000700:Analgesics / Q000494:pharmacology*; D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects*; D029786:Cyperus / Q000737:chemistry*; D051379:Mice; D059226:Nociceptive Pain / Q000188:drug therapy*; D010147:Pain Measurement / Q000379:methods; D010936:Plant Extracts / Q000494:pharmacology*
chemical_list: D000700:Analgesics; D010936:Plant Extracts