Dynarex DynaRub is the fast-acting cream that keeps you moving by stopping pain in its tracks. DynaRub Cream is a pain-relief cream designed to relieve discomfort associated with arthritis, sprains, backaches, bruises, and other minor injuries. The non-greasy menthol formula is easy to use, mess-free, and provides fast-acting relief. Generously apply to large and small areas including wrists, elbows, backs, and knees. It is ideal for use at rehabilitation centers, athletic training centers, schools, and homes. Use before, during, or after activity for long-lasting relief from pain and inflammation.