What is CTN 10 Pill CTN 10 pill is a white, round tablet containing 10 milligrams of a non-sedating antihistamine that works by blocking histamine (H-1) receptors known as cetirizine. Histamine is a substance responsible for many of the signs and symptoms that accompanies allergic reactions, for example, swelling of the lining of the … Continue reading CTN 10 Pills- All You Wanted To Know