Singulair makes you gain weight. . . Can you abruptly stop singulair? Please let me know if this drug can cause weight gain in children and . I have been on Singulair for a couple of years and I agree it does makes you gain weight. Please review and make any edits to your . . . I have never heard of Singulair causing weight gain. . Will Synthroid Make You Gain Weight? My Friend Advised Me to Take Singulair & I Did. claritin, singulair, diovan, progesterone, VSL#3 . Singulair . . . . mild a... more