Instaflex® extra strength pain relieving cream: a doctor developed cream instaflex® extra strength is a doctor developed cream for pain relief. Formulated with an exclusive oxygenated oil, instaflex® extra strength has double the pain-fighting ingredients and double the menthol power. Instaflex® extra strength rubs out your toughest aches and pains: arthritis, strains & sprains, backache, workouts, sports, nighttime pain, and everyday activities. Fast extra strength relief for arthritis, joint and muscle pain formulated with an exclusive oxygenated oil deep penetrating fast acting great for nighttime use relief in minutes, lasts for hours. Instaflex extra strength pain relieving cream - 4 oz. (1 bottle)