_Fluidextractum Heloniatis (Fldext. Helon.), Fluidextract of Helonias, N.F._--Helonias (100%). Absolute alcohol content about 40 per cent. DOSAGE: 2 Cc. or 30 minims (N.F.) =*Hexamethylenamina (Hexam.), Hexamethylenamine, U.S.P.= (Hexamethylene-tetramine; also sold as urotropine, aminoform, formamin, formin, cystamin, cystogen, urisol and uritone).--(CH{2}){6}N{4}, a condensation product of ammonia and formaldehyde. Colorless crystals or white powder, odorless and with a sweetish taste. Freely soluble in water (1:1.5) and in alcohol (1:12.5). Incompatible with acids, with ammonium salts, with tannin and with mercuric chloride. ACTION AND USES: Useful urinary antiseptic, liberating formaldehyde in the presence of acids (not otherwise). Also used as prophylactic against infection in bile and in other body fluids, but inefficient since these fluids are not acid. DOSAGE: 0.25 Gm. or 4 grains (U.S.P.), in solution. When sodium acid phosphate is given to render the urine acid, hexamethylenamine should not be taken until the phosphate has left the stomach =*Homatropinae Hydrobromidum (Homatrop. Hydrobr.), Homatropine Hydrobromide, U.S.P.= (Homatropine Bromide). White, odorless powder. Freely soluble in water (1:6) and soluble in alcohol (1:40). ACTION AND USES: Used as mydriatic and cycloplegic. Its effects resemble those of atropine but occur more promptly and disappear in shorter time. DOSAGE: 0.5 mg. or 1/120 grain (U.S.P.). May be used in aqueous solution of 2 per cent. strength, or a drop of a 1:500 solution may be introduced into the conjunctival sac every five minutes for five times to produce a maximum dilatation in three quarters of an hour =Humulus (Humul.), Hops, U.S.P.= ACTION AND USES: Formerly used as aromatic bitter stomachic. DOSAGE: 2 Gm. or 30 grains (U.S.P.). _Elixir Humuli (Elix. Humul.), Elixir of Hops, N.F._--Fluidextract of hops (12.5%), compound elixir of taraxacum, tincture of vanilla and aromatic elixir. Absolute alcohol content about 25 per cent. DOSAGE: 8 Cc. or 2 fluidrachms (N.F.). _Fluidextractum Humuli (Fldext. Humul.), Fluidextract of Hops, N.F._--Hops (100%). Absolute alcohol content about 50 per cent. DOSAGE: 2 Cc. or 30 minims (N.F.). _Tinctura Humuli (Tr. Humul.), Tincture of Hops, N.F._--Hops (20%) in diluted alcohol. Absolute alcohol content about 45 per cent. USES: Bitter stomachic. DOSAGE: 4 Cc. or 1 fluidrachm (N.F.) =Hydrangea (Hydrang.), Hydrangea, N.F.= (Seven-Barks).--Rhizome and roots. ACTION AND USES: Obsolete cathartic, diuretic and diaphoretic; without established value. DOSAGE: 2 Gm. or 30 grains (N.F.). _Fluidextractum Hydrangeae (Fldext. Hydrang.), Fluidextract of Hydrangea, N.F._--Hydrangea (100%). Absolute alcohol content about 50 per cent. DOSAGE: 2 Cc. or 30 minims (N.F.)