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Panacea.—A medicine curing all diseases; a cure all, as some patent medicines.

Parasiticide.—A substance that destroys various animal and vegetable organisms or parasites which live upon the surface of the body, as mercurial and sulphur ointment, etc.

Parturient or Parturifacient.—Any agent assisting in the birth of the young, as ergot.

Peristaltic.—A medicine which increases the movements of the longitudinal and transverse muscular fibers of the intestines and assists them in expelling their contents as nux vomica, arecoline, etc.

Placebo.—Any medicine or inert substance given for the purpose of satisfying the patient, rather than for its medical effects, as sugar, fenugreek, anise, etc.

Poison.—An agent that when introduced into the body either destroys life or impairs seriously the functions of one or more of its organs, as potassium cyanide, hydrocyanic acid, etc.

Potential.—A medicine which possesses restorative effects, but is delayed in its effects, as potassium iodide, arsenic, etc.