Jan 23, 2019 Over-the-counter antihistamines can be convenient options to treat Zyrtec, Allegra, and Benadryl are some of the most popular. Claritin-D, and Zyrtec-D. Pseudoephedrine is an ingredient that can help with OTC antihistamines like Claritin, Zyrtec, and Allegra can give you . Safe...