Abstract
PURPOSE: Methylnaltrexone (Relistor) is a peripherally acting µ-opioid receptor antagonist indicated for opioid-induced constipation (OIC). In laxative-refractory patients with OIC and advanced illness, such as cancer, multiple doses of methylnaltrexone may be beneficial. We assessed rescue-free laxation (RFL) responses for each successive dose of methylnaltrexone or placebo (≤7 doses) in patients with and without cancer. METHODS: Two multicenter, randomized, double-blind, placebo-controlled, institutional review board–approved studies in adults with OIC and advanced illness, stratified by cancer and noncancer, were pooled (study 302, NCT00402038; study 4000, NCT00672477).
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