Cough suppressant
Dextromethorphan
Syrup
Quick Summary
Dextromethorphan acts on the brain's cough centre.
Dry cough
Medical Uses
Dry cough: Short-term relief.
How it's taken
Use as directed for a short time.
Your doctor decides the right dose for you and how long to take it.
Your doctor decides the right dose for you. Follow their instructions and the label.
Common Side Effects
Drowsiness
Sometimes.
Dizziness
Sometimes.
Nausea
Rarely.
Interactions
Antidepressants
Risk of serotonin syndrome.
Alcohol
Increases drowsiness.
Critical Warnings
Children
Not for young children unless advised.
Misuse
Large amounts are dangerous.
Sources and further reading
Last updated 21 October 2026. For more detail, see these trusted health organisations.
- Dextromethorphan: drug information(opens in a new tab) · MedlinePlus, US National Library of Medicine