Intracanal medicaments are agents used as adjuncts to cleaning and shaping teeth during root canal treatment. Their primary functions are antisepsis and disinfection to help prevent or treat apical periodontitis. Secondary functions include controlling pain, exudation, swelling, and resorption during and after treatment by eliminating infection in the root canal system. Common intracanal medicaments include antibiotics, disinfectants like sodium hypochlorite, and calcium hydroxide, which has antibacterial properties due to its high pH and can physically restrict bacterial colonization in the root canal.