Calpol 650 MG tablet is a popular over-the-counter medication used for the relief of pain and fever. It contains the active ingredient paracetamol (also known as acetaminophen), which is a widely used analgesic (painkiller) and antipyretic (fever reducer) medication. 

Calpol 650 MG Tablet is used to relieve pain and fever associated with a variety of conditions, including headaches, toothaches, menstrual cramps, flu, and other common ailments. It works by inhibiting the production of certain chemicals in the body that cause pain and fever.