Background: Methylnaltrexone (MNTX) is a peripherally acting µ-opioid receptor antagonist indicated for opioid-induced constipation (OIC). We evaluated whether baseline use of laxatives, including stimulants, osmotic agents, stool softeners, or combinations thereof affects the efficacy and safety of MNTX. Methods: This post hoc analysis included pooled data from 2 multicenter, randomized, double-blind, placebo (PBO)-controlled, institutional review [...]

Background: Opioid analgesia is an important treatment modality for patients with chronic pain, including pain attributed to cancer- and noncancer-related illness. Unfortunately, an estimated 40%–80% of opioid users experience opioid-induced constipation (OIC). Methylnaltrexone (MNTX) is indicated for the treatment of OIC. In clinical trials, the most common adverse events (AEs) were gastrointestinal (GI) in nature. [...]