Description: Etoricoxib may be useful in treating other conditions, including pain due to injury, infection, surgery, dental procedures, menstrual cramps, migraine headaches, and sports injuries. Pregabalin is a medication that works by blocking certain chemicals in the brain called glutamate receptors. Glutamate is a chemical messenger that helps send messages between nerve cells. When these receptors are blocked, they stop sending painful signals to the brain.