Voltfast contains 50 mg diclofenac potassium, which belongs to a family of medicines called non-steroidal anti-inflammatory drugs (NSAIDs). These medicines can relieve the symptoms of pain and inflammation but they will not cure your condition. It works by reducing substances in the body that cause pain and inflammation. Diclofenac can also be used as period cramp relief for those who have painful menstrual periods. Being an analgesic, diclofenac can effectively relieve you from migraine attacks, back pain, frozen shoulder, tennis elbow and other forms of soft-tissue rheumatism. In addition, Voltfast can also help you with the pain associated with infections of the ear, nose or throat.