From the manufacturer's website:
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.
*These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure or prevent any disease.