I was on Lexapro for years and took Zyrtec, Claritin, Benadryl, phenylephrine, and pseudoephedrine at various times.
I read there's no drug interactions with Claritin and Lexapro, but adverse affects/reactions between Zyrtec and Lexapro. Flonase, which is an
Loratadine (found in Alavert, Claritin, Claritin-D). Bottom line Lexapro (escitalopram); Nardil (phenelzine); Nefazodone; Norpramin
Lexapro : A selective serotonin reuptake inhibitor, Lexapro and duloxetine Claritin  /loratidine, Zyrtec  /cetirizine, and Allegra Â
Claritin, Xanax Antidepressants (Lexapro, Effexor, Zoloft, Prozac, Paxil, Cymbalta); Antihistamines (Allegra, Zyrtec, Claritin, Alavert)
, such as Zyrtec (cetirizine) and Claritin (loratadine) Antidepressants, such as Elavil (amitriptyline), Celexa (citalopram), and Lexapro (escitalopram)
Claritin Extra (Loratadine) Claritin Liberator (Loratadine) Claritin‐D Lexapro (Escitalopram) Lexxel (Enalapril) Lialda (Mesalamine) Librium
Lexapro and Zoloft; Muscle relaxants; Viagra; Blood thinners; Steroids Claritin. Claritin is a brand name for the drug loratadine, which
Claritin, Claritin-D. ANGINA isosorbide. Isordil. Rapid heartbeat, sudden Lexapro fluoxetine. Prozac nefazodone.paroxetine. Paxil sertraline. Zoloft.
I grant that the effect is real, as many women on Lexapro have found, but its administration has to be subtle.