Alvimopan, a Novel, Peripherally Acting μ Opioid Antagonist

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Abstract
To demonstrate that alvimopan (6 or 12 mg) accelerates recovery of gastrointestinal (GI) function in patients undergoing laparotomy for bowel resection or radical hysterectomy. Postoperative ileus (POI) following laparotomy may increase morbidity and extend hospitalization. Opioids can contribute to the duration of POI. Alvimopan is a novel opioid receptor antagonist in development for the management of POI. A total of 510 patients scheduled for bowel resection or radical hysterectomy were randomized (1:1:1) to receive alvimopan 6 mg, alvimopan 12 mg, or placebo orally ≥2 hours before surgery, then twice a day (b.i.d.) until hospital discharge or for up to 7 days. The primary efficacy end point was a composite of time to recovery of upper and lower GI function. An associated secondary end point was time to hospital discharge order written. The modified intent-to-treat population included 469 patients (451 bowel resection and 18 radical hysterectomy patients). Time to recovery of GI function was accelerated for the alvimopan 6 mg (hazard ratio [HR] = 1.28; P < 0.05) and 12 mg (HR = 1.54; P < 0.001) groups with a mean difference of 15 and 22 hours, respectively, compared with placebo. The time to hospital discharge order written was also accelerated in the alvimopan 12 mg group (HR = 1.42; P = 0.003) with a mean difference of 20 hours compared with placebo. The incidence of adverse events was similar among treatment groups. Alvimopan accelerated GI recovery and time to hospital discharge order written compared with placebo in patients undergoing laparotomy and was well tolerated.

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