Hello and Welcome to ‘Ask A Doctor’ service.
I have reviewed your query and here is my advice.
Nyquil cold and flu contains
Acetaminophen and painkiller and fever reducer
Dextromethorphan as cough suppressant and
Doxylamine Succinate as anti allergic. It is a suitable combination to relieve cough,fever and allergic symptoms.
This composition is safe if taken with the medicine advised to you as they do not cause any severe harmful interaction.
The medicines advised to you are also suitable to treat the symptoms of infection,
allergic reaction and congestion or asthma like symptoms.
As you have not exactly indicated your symptoms for which you are advised these medicines, I would suggest that you should once consult your treating doctor regarding intake of Nyquil whether needed or not.
So, you can take the medicines as per the requirement and symptoms if it is needed.
Hope I have answered your query. Let me know if I can assist you further.
Regards,
Dr. Honey Arora