I take claritin and flonase daily for allergies. it doesn't last into the night however. i'm up coughing, sinus drainage and stuffiness. can i take a 2nd dose of claritin or zyrtec at night? can i take a 2nd dose of flonase at night?

People respond to meds differently & if the usual dose is not effective for the med I would not double up. Fexofenadine (Allegra) is another non-drowsy antihistamine that may work better for you than Claritin. Zyrtec can make you drowsy. Flonase gets a slow response in general. Its a good med but I wouldn't double use for acute symptoms.

It might be helpful to add singulair daily. We MDs state it's not advisable to combine 2 different antihistamines but I've seen multiple examples of adding only 25 mgs of Benadryl at bedtime only without problems. Discuss these suggestions with your physician however.