See also Warning section. This powder form of diclofenac is used to treat migraine headaches. Diclofenac is not used to prevent migraines from happening or lessen how often you get them. Diclofenac is known as a nonsteroidal anti-inflammatory drug (NSAID). It works by blocking your body's production of certain natural substances that cause inflammation. This effect helps to decrease swelling, pain, or fever. View More Info

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