D.F.O. 4X Solution is a pain-relieving medicine. It is used to relieve pain in various conditions such as joint pain, neck pain, sprains, spasms, and others. It works by blocking the release of certain chemicals that cause pain and inflammation. D.F.O. 4X Solution is only for external use. Use it in the dose and duration as prescribed by your doctor. Follow the instructions carefully to get the most benefit. You can also read the package insert for instruction. The dose and duration will depend on what you are using it for and how well it helps your symptoms. Apply a thin layer of the medicine topically to the affected area whenever it is needed or as per the doctor’s instruction.It is generally safe with little or no side effects. However, in some people, it may cause application site reactions such as redness and burning sensations. These are usually mild and resolve with time. If they do not go away or bother you, let your doctor know.Avoid contact of the medicine with your mouth, eyes, or inside of the nose. In case of accidental contact, rinse it off with plenty of water. Do not use the medicine if you have any history of allergic reaction to any of the components present in this medicine.