Anti-pain serum was a type of medical formula used by the Tirolian Robotech Masters. It served as a form of painkiller and allowed the person to ignore injuries sustained on their person. This medicinal substance allowed an individual to survive a shot in the chest and simply step back up without experiencing any pain. The serum was injected through a device into the arm of a subject.
During the Second Robotech War, the weakened forces of the Robotech Masters decided to engage in a final all-out attack against Earth in a desperate attempt to claim the Protoculture Matrix. For this assault, they began gathering their clone civilization population who they forcibly injected with anti-pain serum and sent to battle the Human forces to the bitter end.