Indication: Dayquil is an OTC medication that treats daytime symptoms of cold and flu, which can include nasal congestion, cough, headache, minor aches and pains, fever and sore throat.

Insight:

Dayquil can be taken every 4 hours. Do not exceed 4 doses within 24 hours.
Dayquil Cough can be taken every 6-8 hours.
Dayquil treats cold and flu symptoms for approximately 4 hours. Dayquil Cough provides up to 8 hours of cough relief.
If pregnant or breast-feeding, check with a health professional before taking Dayquil.

Sources:

Vicks Dayquil FAQ – Vicks

vicks Dayquil - Google Search