How much time does it take claritin (loratadine) to work?

Within 1-2 hrs: Claritin (loratadine) is well-absorbed from the gastrointestinal tract and its effect is often felt within 1-2 hours. Claritin is metabolized in the liver into Desloratadine (the main ingredient in clarinex) which can stay in your system for many hours, allowing these antihistamines to be dosed once daily.

Who knows: Work for what? Claritin supposedly starts working within 90 minutes. But Claritin is also the weakest binding antihistamine sold over the counter. Personally, i feel Claritin is a waste of money. Use a stronger antihistamine like fexofenadine or Cetirizine which cause minimal to no sedation. Use Benadryl (diphenhydramine) only at nighttime because it can make you drowsy.