Allergy and cold
Dextromethorphan
Cough suppressant
Other names: Delsym, Robitussin DM, DayQuil
FAA guidance
Do not fly while taking it.
Wait
At least 5 dosage intervals after the last dose (over-the-counter guide)
FAA label
NO GO
The FAA's over-the-counter guide lists dextromethorphan (Delsym), which it says is also in Dayquil and Mucinex Fast-Max Severe Congestion and Cough, in its Avoid (No Go) column, among products it says can cause incapacitation.
Track your medicationsMore detail: dextromethorphanThe rest of Crosscheck's reading, in plain wordsOpen
The same row says that if the label states PM (for nighttime use) or DM (containing dextromethorphan), you should not fly while using these medications and for at least five dosage intervals after the last dose.
Show the FAA's words: dextromethorphanThe official FAA wording: one passage, each with its document and dateOpen
AVOID
These can cause incapacitation.
NO GO
dextromethorphan (Delsym) Also in Dayquil, and Mucinex Fast-Max Severe Congestion and Cough.
If the label states PM (for nighttime use) or DM (containing dextromethorphan), you should not fly while using these medications and for at least 5 dosage intervals after the last dose (see Dosage Interval Timetable).