Domiphen bromide is a chemical antiseptic and a quaternary ammonium compound with cationic surfactant properties; it acts primarily by adsorbing to and disrupting microbial cell membranes. In pharmaceutical practice it is used as a preservative and antiseptic at low concentrations, including incorporation into oral liquid formulations such as some children ibuprofen suspensions where it is formulated together with excipients like maltitol or maltodextrin, sweeteners, suspending agents (for example xanthan gum), glycerol or sorbitol as humectants, flavoring agents and buffering salts. Typical use concentrations in oral suspensions are low, on the order of hundredths to tenths of a percent weight by volume, and the ingredient is selected for compatibility with nonionic and anionic excipients and with the active ibuprofen over usual suspension pH and storage conditions. Physicochemical properties relevant to formulation include its quaternary ammonium structure giving water solubility as the bromide salt and its tendency to interact with anionic species and certain anionic surfactants, which must be considered during formulation development.
Typical quality control specifications for domiphen bromide used in pharmaceutical products define a high assay and tight limits for related substances; a representative specification would show assay by validated HPLC at not less than 98.0 percent on a dry basis, total related compounds not greater than 2.0 percent, and any individual related compound not greater than 0.5 percent. Common related compounds observed in analytical profiles include dequaternized tertiary amine degradation products, alkyl-chain homologs and short-chain impurities, N-oxide derivatives and minor dibromide or counterion-related species. Other routine quality limits address residual solvents such as ethanol or isopropanol generally limited to parts per million levels in line with pharmacopeial guidance, water content typically controlled below about 1.5 percent by Karl Fischer, and heavy metals controlled to low ppm levels. Exact numerical limits and analytical methods should be taken from the supplier certificate of analysis and the finished product regulatory dossier.
Domiphen bromide is used as an antiseptic and preservative in topical and some oral liquid pharmaceutical formulations; in practice it is included at low concentrations to inhibit microbial growth and to stabilize multiingredient products such as certain children’s ibuprofen suspensions where it works alongside excipients like maltitol, suspending agents, sweeteners and buffers.
The empirical chemical formula commonly reported for domiphen bromide is C22H42BrN.
