From the Research
No, DayQuil does not contain an antihistamine. DayQuil typically contains three active ingredients: acetaminophen (a pain reliever and fever reducer), dextromethorphan (a cough suppressant), and phenylephrine (a nasal decongestant). Unlike its nighttime counterpart NyQuil, which contains the antihistamine doxylamine succinate that can cause drowsiness, DayQuil is formulated without antihistamines specifically to avoid sedating effects so it can be taken during the day without causing sleepiness.
Key Points to Consider
- If you're experiencing allergy symptoms like sneezing, itchy eyes, or runny nose due to histamine release, DayQuil won't directly address these symptoms.
- For allergy relief, you might consider a dedicated antihistamine medication like loratadine (Claritin), cetirizine (Zyrtec), or diphenhydramine (Benadryl), though be aware that diphenhydramine can cause drowsiness, as noted in studies on antihistamine use 1.
- Always check the specific formulation of any cold medicine as ingredients can vary between different product lines and special formulations.
Additional Considerations
- The use of antihistamines for allergic conditions is well-supported by evidence, with second-generation antihistamines being preferred due to their safety and efficacy profile 1.
- The choice of antihistamine may depend on patient preference, access, and costs, as well as the specific condition being treated, such as allergic rhinitis or urticaria 1, 2.