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After the secretions have been fully established and the characteristic whoop has appeared, the indications in the treatment are to relieve the respiratory tract of its burden by occasional emesis with alum or ipecacuanha, to give freely antispasmodics and sedatives, as belladonna, chloral, the bromides, hydrobromic acid, or, as recommended by some, digitalis; to give quinia freely, and to use counter-irritants to the neck and chest with liniments composed of oil of amber, croton oil, or turpentine.

It combines directly with bromine, and, with fuming hydrobromic acid at 100� C., it gives chiefly α-brombutyric acid.

Hydrobromic, hī-dro-brō′mik, adj. compounded of bromine and hydrogen.—n.

Hydrobrō′mate, a salt of hydrobromic acid—same as bromide; also Bromhydrate.

When heated with concentrated hydrobromic or hydriodic acids, it is converted into fumaric acid.