Montelukast
"I've had asthma all my life and after 14 years, montelukast was introduced to aid my other medication. For a year and a half my asthma was controlled, and then my dosage was doubled because I turned 16. After the increased dosage, my mental health worsened, and after dealing with terrible anxiety and depression for 18 months, I realised that it fitted with the time period that I'd been taking this and was worsened with increased dosage. It had all been side effects. The extra montelukast was a tipping point in my mental health and I became suicidal. I stopped using this immediately and my parents got me help, after 6 months I had recovered. I share this in the hope that it prevents the same thing from happening."