Ammonium bromide (NH ₄ Br) is a white crystalline inorganic compound with core functions concentrated in the fields of medicine, photosensitive materials, chemical industry, flame retardant and anti-corrosion, water treatment, etc. The following are its main uses and system of action:
1、 Medical field
1. Central sedation and anticonvulsants
      Bromine ions inhibit the excitation process of the cerebral cortex, enhance inhibitory function, and balance neural activity.
      Used for sedation treatment of neurasthenia, insomnia, epileptic seizures, and mental stress.
      Due to side effects such as bromine accumulation, drowsiness, and rash, it is now less commonly used in modern clinical practice.
2. expectorant effect
      Stimulating the gastric mucosa, reflexively promoting the secretion of bronchial glands, diluting sputum, facilitating coughing up, used in respiratory expectorant formula.
2、 Photographic Material Industry (Core Applications)
      The key raw material for manufacturing silver halide photosensitive emulsions (film, photographic paper, industrial radiographic film).
      Reacts with silver nitrate to produce silver bromide (AgBr), which serves as the photosensitive core and determines the film sensitivity and imaging quality.
      Improve emulsion stability for traditional photography, printing plate making, and non-destructive testing films.
3、 Chemical and analytical fields
1. Analytical reagents
      Used for drip analysis of metal ions such as copper, arsenic, tin, etc.
      Prepare intermediates for other bromides such as potassium bromide and silver bromide.
2. Organic synthesis
      As a phase transfer catalyst, bromination reagent, and reaction medium, it participates in substitution and addition reactions.
3. Electroplating and Materials
      Gold/silver plating solution additive to improve coating uniformity and adhesion.
Glass manufacturing iron remover to improve transparency.
4、 Flame retardant and anti-corrosion
1. Flame retardants
      Heat decomposition releases HBr, captures combustion free radicals, inhibits chain reactions, and is used for flame retardancy in wood, plastic, and rubber.
2. Wood preservatives
      Inhibit the growth of fungi and bacteria, and extend the service life of outdoor wood/building materials.
5、 Water Treatment and Environmental Protection
      Adjust the pH of the water and use it as a coagulant to improve water quality.
      Used in sewage treatment for desulfurization and denitrification processes to remove sulfides and nitrogen oxides.
6、 Other applications
      Agriculture: Trace bromine fertilizer, supplemented with plant bromine elements (strict control of dosage is required).
      Stone plate printing: used in plate making process to improve printing clarity.

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