Flector is used in the treatment of pain resulting from bruising, strains or minor sprains. Flector patches have diclofenac, which is an NSAID (nonsteroidal anti-inflammatory drug). Diclofenac functions by decreasing hormones that result in pain and inflammation in the human body. Flector relieves pain by blocking a substance that is responsible for pain and inflammation in the human body. Pain may be a signal that someone's body has experienced a type of tissue damage.