Don't take Coricidin. Make sure that you ingest medication with only Dextromethorphan in it. DXM HBr is fine. All the other crap they put in there is what sends kids to the hospital.

DXM has caused brain damage in test animals (Olney's Lesions). Olney's Lesions have not been found in humans, but it is probably due to a lack of testing. There may or may not be risks, it's up to you to do the research and be prepared to take those risks.