1. Pharmaceuticals

• Sedative and Anticonvulsant Formulations (Historical Use): Ammonium bromide was historically used in sedatives and anticonvulsants due to the calming effects of bromide ions on the nervous system. Though now largely replaced by safer alternatives, it remains important in historical formulation studies and research.
• Reagent in Active Pharmaceutical Ingredient (API) Synthesis: Acts as a bromide source in organic synthesis for introducing bromine-containing functional groups, especially in intermediate or catalyst-assisted reactions.

2. Construction

• Brine Formulation in Drilling Operations: Used in clear brine fluids for oil well drilling and completion, where it helps control formation pressure, cool the drill bit, and prevent formation damage. The bromide ion provides high-density fluid properties.
• Shale Stabilizer: Prevents shale swelling and formation damage during drilling in reactive clay formations, thereby maintaining wellbore integrity.

3. Performance Chemicals

• Intermediate in Bromination Reactions: Ammonium bromide serves as a source of Br⁻ ion in nucleophilic substitution and bromination reactions, helping to introduce bromine into organic molecules during synthesis.
• Catalyst Component or Additive: Used in the formulation of phase-transfer catalysts and in ionic reactions where halide ions are necessary for reaction completion or pH stabilization.
• Analytical Reagent: Used in chemical analysis to precipitate or test for certain cations (like silver ions), or in titration procedures involving halide detection.
• Buffer or Ionic Medium: Acts as a source of ionic strength in various experimental setups, especially in biochemical buffer systems or ionic mobility studies.

4. Fabric Solutions

• Mordant in Dye Fixation: Acts as a mordant (fixing agent) in dyeing processes, especially when working with acid and reactive dyes. It enhances color fastness and improves dye bonding on fabric surfaces.