From JTA: “All eight varieties of Triaminic [have] received the kosher stamp of approval from the Orthodox Union…The approval is believed to be the first time the Orthodox Union, the world largest’s largest kosher certifying agency, has certified an over-the-counter medicine as kosher.”
Other varieties of cough syrups and such can contain glycerine, which is not kosher as it is sometimes derived from horse bones or something equally disgusting. That’s enough right there to make us search out the big “U” next time we have the sniffles.