患者，男，20岁。无明显诱因出现右侧腹部持续性腹痛并阵发性加重;腹部平片：中下腹局限性肠腔积气，局部不典型气液平面。肛门无排气、排便。症见腹痛腹胀，恶心呕吐,伴发热，口渴，小便短赤，舌质红，苔黄燥，脉洪数。该患者首选方剂是

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