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Antagonistic.—A medicine which counteracts the action of another medicine in the system, as would Potassium Bromide and Nux Vomica or Strychnine.

Anthelmintic.—A medicine efficiently destroying or expelling worms or preventing their development, as Santonin, Arecae Nut, etc.

Antidote.—A substance preventing or counteracting the action of a poison. Antidotes are distinguished as: chemical, those that change the chemical nature of the poison; mechanical, those that prevent absorption of poison; physiologic, those that counteract the effects of poison by producing other effects.

Antiemetic.—A medicine which prevents or arrests vomiting, as Bismuth Subnitrate.

Antifebrile.—A medicine that reduces temperature, as Acetanilid, etc.

Antiferment.—A medicine which prevents the formation of gases, as Sodium Bicarbonate, Turpentine, etc.

Antigalactic.—A medicine which lessens the secretion of milk, as Belladonna, Tannin, etc.

Antiparasitic.—An agent which destroys and repels insects, as essential oils, powdered tobacco, sulphur and naphthalin, etc.