Like all medications, dextromethorphan can have side effects, but these are usually rare in all patients.
However, there is a risk of some serious side effects that you will need to be aware of before taking this medication for the first time.
These include symptoms of a severe allergic reaction, such as:
Itching
Rashes
Hives
Difficulty breathing or swallowing
Swelling of the face, mouth, tongue, or throat
If you experience any of these symptoms, make sure to seek immediate medical attention.