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Narita, M. et al.

Minoru Narita, Daisuke Takei, Mitsuru Shiokawa, Yuri Tsurukawa, Yuki Matsushima, Atsushi Nakamura, Shigemi Takagi, Megumi Asato, Daigo Ikegami, Michiko Narita, Taku Amano, Keiichi Niikura, Keisuke Hashimoto, Naoko Kuzumaki, Tsutomu Suzuki,

Suppression of dopamine-related side effects of morphine by aripiprazole, a dopamine system stabilizer.

Dopamine receptor antagonists are commonly used to counter the adverse effects of opioids such as hallucinations, delusions and emesis. However, most of these agents themselves have side effects, including extrapyramidal symptoms. Here, we investigated the effect of the dopamine system stabilizer aripiprazole on morphine-induced dopamine-related actions in mice. Morphine-induced hyperlocomotion and reward were significantly suppressed by either the dopamine receptor antagonist prochlorperazine or aripiprazole. Catalepsy was observed with a high dose of prochlorperazine, but not with an even higher dose of aripiprazole. The increased level of dialysate dopamine in the nucleus accumbens stimulated by morphine was significantly decreased by pretreatment with aripiprazole. These results suggest that the co-administration of aripiprazole may be useful for reducing the severity of morphine-induced dopamine-related side effects.[1]

References

Suppression of dopamine-related side effects of morphine by aripiprazole, a dopamine system stabilizer. Narita, M., Takei, D., Shiokawa, M., Tsurukawa, Y., Matsushima, Y., Nakamura, A., Takagi, S., Asato, M., Ikegami, D., Narita, M., Amano, T., Niikura, K., Hashimoto, K., Kuzumaki, N., Suzuki, T. Eur. J. Pharmacol. (2008) [Pubmed]

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