Montelukast
"My daughter is 7 yrs and she had been taken Singular for 4 yrs It worked great. But for the last 3 months my daughter started have extreme anxiety issue over little things to the point where she wasn't herself. Saying things like nobody loves me, I am a bad kid,  you should just get rid of me. she was having tantrums, outbursts of disruptive behavior. major mood swings. Crying hysterically at night. I researched and researched in what was causing this behavior and came across side effects of her meds and it was worth a try even though it could alter her health but her mental health I was way more concerned about. By the 5th day of her being off on the meds she was back to her normal loving and positive self.I will never give it to her again"