See Also: histamine h2 antagonists(medicine)
histamine h1 antagonists(medicine)
histamine antagonists(medicine)
histamine(dictionary)
Histamine(health)
Histamine(medicine)
histamine(dictionary)
histamine(encyclopedia)
AII Antagonists(health)
muscarinic antagonists(medicine)

negation (iou) and histamine h1 antagonists (medicine)


negation (iou)



negation noun. LME.
[Old & mod. French negation or Latin negatio(n-), formed as NEGATER: see -ATION.]
The action of contradicting a statement or allegation, the making of a statement involving the use of a negative word, as 'no', 'not', 'never', etc., (foll. by of). Also, an instance of this; a negative statement, doctrine, etc.; a refusal, a contradiction; a denial (of). LME.
b. In Logic, (an) assertion that a proposition is false; in Computing, = INVERSION 15. L16.
The absence or opposite of a thing which is actual, positive, or affirmative. M17.
A negative or unreal thing, a nonentity; a thing whose essence consists in the absence of something positive. E18.
Comb.: negation-sign Logic a sign or symbol used to indicate negation.
negational adjective negative, using or involving negation M19.
negationist noun = NEGATIVIST noun M19.

histamine h1 antagonists (medicine)


histamine h1 antagonists
Drugs that selectively bind to but do not activate histamine h1 receptors, thereby blocking the actions of endogenous histamine. Included here are the classical antihistaminics that antagonise or prevent the action of histamine mainly in immediate hypersensitivity. They act in the bronchi, capillaries, and some Other smooth muscles, and are used to prevent or allay motion sickness, seasonal rhinitis, and allergic dermatitis and to induce somnolence. The effects of blocking central nervous system h1 receptors are not as well understood.