Dextromethorphan
Also sold as: Robitussin, Benylin
No prescription neededCough and cold
Comes as:SyrupTablet
Also sold as: Robitussin, Benylin
Usual adult dose: 10 to 20 mg every 4 hours, or 30 mg every 6 to 8 hours, for a dry cough. Do not take more than 120 mg in 24 hours. Not for children under 6 years unless a doctor advises.
Your doctor may give you a different dose. Children's doses depend on weight.
Stop taking it and see a doctor straight away if you notice:
Medicines that can react with this one.
Fluoxetine raises dextromethorphan levels and the combination can cause serotonin syndrome.
Paroxetine raises dextromethorphan levels and the combination can cause serotonin syndrome.
Both increase serotonin and cause drowsiness; the combination is best avoided.