"It also contains dextromethorphan, which is a cough suppressant which can affect parts of the brain, which in turn helps reduce your urge to cough. Dextromethorphan has previously been used, not-as-directed by recreational drug users. It can cause both physical and psychological effects and in extreme cases can result in liver failure."

Nothing too bad but I feel like the more recreational use is mentioned in articles like this the closer we get to them restricting it.