Acridine hydrochloride is a nitrogen-containing cationic fluorescent dye that primarily binds to RNA and DNA and is used in cell cycle research. Acridine derivatives exhibit a range of biological activities, including antibacterial, anticancer, antibiotic, anticholinesterase, antileukaemic, antimalarial, antipsychotic, antidepressant, anti-ageing, and telomerase-inhibiting effects.