Not Medical Advice:
A white, barrel-shape pill with CTN 10 imprint has been identified as Cetirizine hydrochloride 10 mg.
Cetirizine belongs to the group of drugs called antihistamines. It reduces the natural chemical histamine in the body. Histamine can produce symptoms of sneezing, itching, watery eyes, and runny nose.
Cetirizine is used to treat allergic rhinitis, urticaria, as well as cold or allergy symptoms such as sneezing, itching, watery eyes, or runny nose.
Need some helpful tips for combating your allergies? WebMD offers 9 tips for keeping seasonal allergy symptoms at bay.