Dextromethorphan
"I gave this product to my 5 year old who has been battling nighttime coughs after getting over a never-ending cold. Within 2 hours, he was vomiting. This went on for 3 more hours. Shortly after that, he started complaining of stomach pains and the need to poop.  He unfortunately still has the cough and I feel like a terrible momma for not checking the side effects first. I'd rather deal with him coughing than to put him through this ever again!"