I tried Allegra today for the first time thinking that perhaps my stuffy head was a result of allergies, but it seems that I m just suffering a bad cold (I had no relief with Allegra). I took the Allegra at 10am. Is it safe to now take DayQuil (8pm)?
For bad colds, levocetrizine 5 mg daily once is more suitable. Do some steam inhalations as well, your stuffiness shall improve