Can I take Zyrtec at night and Allegra during the day?. Can I take Zyrtec and Allegra together? I am having really bad seasonal allergies. Antihistamines, such as Zyrtec, Claritin and Allegra. Should You Use Nasacort, Zyrtec, Claritin or Allegra for Your Spring Allergy Symptoms?. Zyrtec and Allegra together?? Can you take all 3 together?. a day of combinations of claritin, zyrtec and allegra with no side effects for my. Can I take allegra and zyrtec together. since Allegra is a once a day antihistamine, you shouldn't take. I've taken Claritin, Zyrtec, & Allegra, and none of. you can stay signed in to WebMD.com on this computer for up to 2 weeks or. zyrtec and claritin together?. Can I take Claritin and Zyrtec together. Common Questions and Answers about Taking claritin and zyrtec together. eustacian tube and told me to take Claritin and. I can't take allegra and sudafed. Common Questions and Answers about Allegra and zyrtec together. I have bad pollen allergies and take several 24 hour Zyrtec a day (Claritin and Allegra did nothing). Summary: drug interactions are reported among people who take Allegra and Claritin together. Support group for people who take Allegra.