Pyridazin-4-ol hydrobromide is primarily utilized in the field of medicinal chemistry and pharmaceutical research. It serves as a key intermediate in the synthesis of various biologically active compounds, particularly those targeting neurological and cardiovascular disorders. Its structure is often modified to develop potential therapeutic agents, including inhibitors for enzymes like phosphodiesterases, which play a role in regulating cellular processes. Additionally, it is explored for its potential in creating novel anti-inflammatory and antimicrobial agents, contributing to the development of new treatments for infections and inflammatory conditions. Researchers also investigate its use in designing compounds for cancer therapy, leveraging its core structure to target specific pathways involved in tumor growth.