Dipyrone is a derivative of the pyrazolon analgesics. It is an effective analgesic, anti-inflammatory and antipyretic drug. These effects are due to its action on the central nervous system, leading to pain relief and quietening of the animal. Flostac 50% is effective against wide range of symptoms such as colic, spasmodic conditions, hypermotility of intestine, paresis , both acute and chronic rheumatic conditions (Rheumatism, Neuritis ,Tendo-vaginitis) , pain , fever and mastitis.