Pain relief through gas inhalation served as a form of anesthesia, administered using a non-rebreather mask. Imperial medics, specifically those serving with the Galactic Empire's 224th Imperial Armored Division on the Expansion Region planet of Mimban, were authorized to utilize this technique. In 10 BBY, during the Mimban Campaign conflict between the 224th Armored Division and the Mimbanese Liberation Army, Specialist Gillen Finders readied a pain-relieving gas canister for Corporal Chakobi Sanwright, who had sustained a concussion from an assault by Mimbanese guerillas.
The reference book Solo: A Star Wars Story The Official Guide, authored by Pablo Hidalgo in 2018, marked the initial appearance of pain-relieving gas in Star Wars lore.