Morphine applies an agonist effect at saturable opioid receptors in the CNS and other tissues & acts as opioid analgesic.
Severe chronic pain or pain resistant to other analgesics, in particular pain associated with cancer
Relafen is used in the treatment of back pain; sciatica; muscle pain; frozen shoulder; osteoarthritis (and more), and belongs to the drug class nonsteroidal anti-inflammatory agents. Risk cannot be ruled out during pregnancy. Relafen 750 mg is not a controlled substance under the Controlled Substance Act (CSA).