Blistex Lip Medex is formulated to provide quick cooling lip relief you can feel working. Lip Medex also helps to restore a healthy moisture balance to lips. Sore Lips: Lip Medex’s medicated ingredients deliver a noticeable and immediate cooling action to provide fast relief from the hot, itching sensations that accompany sore lips. Serious Dryness: Lip Medex provides a special barrier that helps lip cells return to their natural moisture balance.