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POPSGASP! Singulair possibly linked to mood changes, suicide. In February 2008, FDA and Merck discussed how best to communicate these labeling changes to prescribers and patients. Merck plans to highlight the recent changes in the prescribing information in face-to-face interactions with prescribers and provide prescribers with patient information leaflets about Singulair. The Singulair website includes the most current prescribing information and patient information for Singulair (www.singulair.com).