Displaying 7 results of Olopatadine Stable Isotopes Olopatadine is a selective histamine H1 antagonist used for the treatment of allergic rhinitis and conjunctivitis. Stable isotopes of Olopatadine are non-radioactive isotopes that have the same number of protons and electrons as the naturally occurring Olopatadine, but a different number of neutrons. These isotopes are used in research to study the pharmacokinetics and metabolism of the drug.