Abstract
Antinociceptive activity of methanolic extract of aerial parts of Epilobium hirsutum (EH) was determined in the Hot plate and writhing tests in mice. Nearly all extracts showed a dose dependent and marked analgesic activity in mice in the thermal and chemical models of analgesia when compared to the control. Methanol extract at dose of 500 mg kg(-1) showed higher activity (97.7% writhing inhibition) than diclofenac 50 mg kg(-1) i.p., (77.8%, p<0.05) and morphine 5 mg kg(-1) i.p. (91.2%, p<0.05). Methanol extract, in all tested doses (200-500 mg kg(-1)) significantly increased the pain threshold in hot plate test (p<0.05). EH extract at 200 mg kg(-1) showed a similar effect to morphine at 5 mg kg(-1). These finding indicate the potential therapeutic use of methanolic extract of aerial parts of EH as a potent antinociceptive agent. LD50 was obtained 1.5+/-0.1 g kg(-1). EH extract did not induce locomotor impairment in mice at any tested doses.
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