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Analgesic, antiinflammatory and hypoglycaemic effects of ethanol extract of Zingiber officinale (roscoe) rhizomes (zingiberaceae) in mice and rats

The present study was undertaken to investigate the analgesic, antiinflammatory and hypoglycaemic effects of Zingiber officinale dried rhizomes ethanol extract (ZOE) in mice and rats. The analgesic effect of ZOE was evaluated by ‘hot‐plate’ and ‘acetic acid’ analgesic test methods in mice; while the antiinflammatory and hypoglycaemic effects of the plant extract were investigated in rats, using fresh egg albumin‐induced pedal oedema, and streptozotocin (STZ)‐induced diabetes mellitus models. Morphine (MPN, 10 mg/kg), diclofenac (DIC, 100 mg/kg) and chlorpropamide (250 mg/kg) were used as reference drugs for comparison. ZOE (50–800 mg/kg i.p.) produced dose‐dependent, significant (p < 0.05–0.001) analgesic effects against thermally and chemically induced nociceptive pain in mice. The plant extract (ZOE, 50–800 mg/kg p.o.) also significantly (p < 0.05–0.001) inhibited fresh egg albumin‐induced acute inflammation, and caused dose‐related, significant (p < 0.05–0.001) hypoglycaemia in normal (normoglycaemic) and diabetic rats. The findings of this experimental animal study indicate that Zingiber officinale rhizomes ethanol extract possesses analgesic, antiinflammatory and hypoglycaemic properties; and thus lend pharmacological support to folkloric, ethnomedical uses of ginger in the treatment and/or management of painful, arthritic inflammatory conditions, as well as in the management and/or control of type 2 diabetes mellitus in some rural Africa communities. Copyright © 2006 John Wiley & Sons, Ltd.