For patients with constipation, especially those with opioid-induced constipation, there is insufficient evidence to recommend one laxative over another. The choice of laxatives should be based on past patient experience, tolerability, and adverse effects. Methylnaltrexone is a newer agent that may be useful especially for patients with opioid-induced constipation that has not responded to standard laxatives, but there is limited evidence of potential adverse effects. Therefore, judicious use preceded by a discussion with patients about known risks and benefits is warranted.
The Cochrane Library recently discussed this review in its Journal Club feature, which includes open access to the full text of the review, a podcast by the authors, discussion points, and a Powerpoint slide presentation of the review's main findings.