Singulair Side Effects: are claritin and Zyrtec the same http://www.medications.com/effect/view/36771 are claritin and Zyrtec the same They are both antihistamines. More side effects have been report Thu, 20 Nov 2008 16:57:04 -0500 http://www.medications.com/effect/view/36771?item=14698 They are both antihistamines. More side effects have been reported with Zyrtec. http://www.medications.com/effect/view/36771?item=14698