DayQuil Cough can be taken every 6-8 hours. Q: How long does DayQuil last? A: DayQuil treats cold and flu symptoms for approximately four hours. DayQuil Cough provides up to 8 hours of cough relief. Q: How long does it take for DayQuil to work? A: This depends on many factors but ...
Take the DayQuil doses 4 hours apart during the day. If you are using one dose of NyQuil at night do not use more than 3 doses of DayQuil during the day, and use less if possible to treat your symptoms. Take the NyQuil dose at night at least 4 to 6 hours after your last DayQuil...