What happens if i take 3 claratins?

No added benefit: Research has shown that there was some benefit going from 5mg to 10 mg dose, but after that there isn't any and so the max dose was set at 10. It is a nonsedating antihistamine and so i would venture to say that likely you will not feel much different at all. If you have bad allergies symptoms, consult your doc for evaluation and treatment rather oding yourself with claritin (loratadine). Good luck.