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Effect of Sw FrIII (a) and Sw FrIV (b), morphine or indomethacin on the latency period to thermal stimuli (hot-plate) induced in male Wistar rats. Animal received morphine or indomethacin (both 5 mg/kg, s.c.). Saline, Sw FrIII or Sw FrIV (2.5, 5 or 10 mg/kg) was injected intravenous. Data are expressed as mean ± standard error of mean of six rats per group. *P < 0.05 indicates significant difference from the saline group (ANOVA, Tukey's test)
