Deep Heat Heat Rubprovides relief from muscular pains and stiffness including rheumatic pain, back pain, sciatica, fibrositis, sprains, bruises and chilblains. The heat rub can also be used before or after exercise. This dual action heat rub provides targeted, warming relief at site of pain. It contains aspirin-like drug methyl salicylate for targeted pain relief. Warming ingredients in it increases blood flow and provides soothing pain relief.