Montelukast
"Although this medication seemed to help my allergy symptoms, my mental health took a terrible turn. For the last few months, I've been having crazy outbursts, going "from 0 to 100" very quickly on an emotional scale. I became super aggressive, could not stop crying, and would lay in the bathtub having suicidal thoughts. I know now that it was this medication, and my doctor told me to STOP taking it. These side effects could ruin someone's life, especially if the people around you don't understand why your behavior has changed. I've also been suffering from severe fatigue--fatigue that is much worse than my normal allergy fatigue. I'd recommend allergy shots instead, even though they are super inconvenient for many people!"