Abstract
The present study was conducted to investigate the effect of oral administration of calcium gluconate and magnesium acetate on morphine withdrawal syndrome. Mice were rendered dependent on morphine by subcutaneous injection of increasing doses of morphine. Mice were observed for 30 minutes for the withdrawal signs (jumping or standing events, diarrhea, piloerection, tremor and ptosis). Separate oral administration of magnesium (50, 75 and 100mg/kg) and calcium (500, 750 and 1,000mg/kg) significantly decreased the jumping, without affecting standing in animals withdrawn from morphine. Co-administration of magnesium (at a fixed dose of 100mg/kg) and calcium (at a range of doses from 250 to 1,000mg/kg) resulted in a significant reduction in jumping and standing events (P<0.05). In a similar fashion, the qualitative signs of withdrawal were also reduced when the above combination of calcium and magnesium was administered. Co-administration of calcium/magnesium at 500/50, 750/75 and 1,000/100mg/kg significantly reduced the number of jumps in morphine-dependent animals without affecting the number of standing events. This study demonstrates the potential activity of the co-administration calcium and magnesium in preventing the signs associated with morphine withdrawal syndrome.
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