Voltaren is available as an injectable solution called an ampoule. Diclofenac sodium, the active component, is present in 75 mg per ampoule. Non-steroidal anti-inflammatory drugs (NSAIDs) are a class of medications used to treat inflammation and pain, and Voltaren is one of them. Injections into the muscles The following problems are treated with Voltaren: gout attacks; gallstone or kidney pain; pain and swelling following surgery and traumas; severe migraine attacks; back pain syndrome; rheumatic crises and pains (arthritis); frozen shoulder, tennis elbow, and other types of rheumatism. Voltaren intravenous infusions are used to relieve or prevent post-operative pain.