Propylamine

An alkaline liquid [CH3(CH2)2.NH2] the salts of which are useful in chorea and hysteria. Dose: 10o to 20 grains thrice daily. The name is also erroneously given to a 10-per-cent. solution of trimethylamine, which, like true propylamine, is a colourless fluid of ammoniacal odour. Soluble in water. Anodyne and sedative in chorea, rheumatism, and pneumonia. Dose:20 to 60 minims.

Protargol

A proteid compound of silver. It is a yellow powder, containing 8.3 per cent. of silver, and is soluble in water. A 1/4 to 2 per cent. solution is used as an antiseptic injection in gonorrhoea, and a 10 to 20 per cent. solution by oculists in place of silver nitrate.

Ptyalin

An amylolytic ferment. A yellowish powder, soluble in water and glycerin. Dose:5 grains or more.

Purgatin, or purgatol, is diacetyl-anthrapurpurin, a yellow, crystalline powder, insoluble in water and dilute acids, but dissolving in dilute alkali, forming a violet-red solution. Is an aperient of the cascara-sagrada type. Dose: 71/2 to 15 grains or more.

Purgen

A trade-name for a phenolphthalein preparation.

Pyocyanase

A preparation of an enzyme obtained from Bacillus pyocyaneuswith nuclease. Used to spray the throat to dissolve the membrane in diphtheria.

Pyoktanin

A trade-name for two aniline dyes related to methyl violet, and used in surgery on the supposition that they stain and kill microbes. Yellow pyoktanin is used for eye-diseases (0.5-per-cent. solution) and in syphilis, the blue for surgical cases (1 to 2 per cent. solution, ointment, and dusting-powder). There is also a mercurial compound used as a gonorrhoeal antiseptic (1 to 100 of water).

Pyonin

A form of finely divided sulphur.

Pyramidon is dimethyl-amido-antipyrin. Almost white crystals, soluble in water (1 in 10). Antipyretic. Dose:5 grains or more. The neutral camphorate and acid camphorate are given in the same doses, and the salicylate is especially recommended for phthisis and in mild fevers. Dose:10 to 15 grains.

Pyrantin is a succinic derivative of phenetidin (para-ethoxyphenyl-succinimide). Pyrantin soluble, the sodium salt, is employed. Dose: 5 to 10 grains.

Pyridine

Used for inhalation in asthma. It is a colourless fluid, soluble in water and alcohol. A fluid drachm of it is poured upon a plate and inhaled. For diphtheria 10-per-cent. solution is brushed on the membrane. Internally, 5 to 10 drops in water is the dose. Pyrodin is acetyl phenylhydrazine, an antipyretic and antirheumatic remedy in 5 to 10 grain doses, also used externally as a 1-in-10 ointment for psoriasis.

Pyrilin

The trade-name for a preparation of pyridin ethylphos-phinate, which should not be confounded with Pyrolin, a magnesium-acetate disinfecting preparation.

Pyrosal

See Acetopyrin.

Pyrozone

A 50-per-cent. solution of hydrogen peroxide in ether.