Antihistamines

Antihistamines
Drugs that combat the histamine released during an allergic reaction by blocking the action of the histamine on the tissue. Antihistamines do not stop the formation of histamine nor do they stop the conflict between the IgE and antigen. Therefore, antihistamines do not stop the allergic reaction but protect tissues from some of its effects. Antihistamines frequently cause mouth dryness and sleepiness. Newer "non sedating" antihistamines are generally thought to be somewhat less effective. Antihistamine side effects that very occasionally occur include urine retention in males and fast heart rate.
* * *
Drugs having an action antagonistic to that of histamine on either H1 or H2 receptors; H1 type a. are used in the treatment of allergy symptoms; whereas H2 type a. reduce gastric acidity in ulcer disease and gastroesophageal reflux.

Medical dictionary. 2011.

Игры ⚽ Поможем написать реферат

Look at other dictionaries:

  • antihistamines — n. drug which counteracts histamine in the body (treatment for allergies) …   English contemporary dictionary

  • H1 antagonist — An H1 antagonist is a histamine antagonist of the H1 receptor that serves to reduce or eliminate effects mediated by histamine, an endogenous chemical mediator released during allergic reactions. Agents where the main therapeutic effect is… …   Wikipedia

  • antihistamine — /an ti his teuh meen , min/, n. Biochem., Pharm. any of certain compounds or medicines that neutralize or inhibit the effect of histamine in the body, used chiefly in the treatment of allergic disorders and colds. [1930 35; ANTI + HISTAMINE] * *… …   Universalium

  • drug — drug1 /drug/, n., v., drugged, drugging. n. 1. Pharm. a chemical substance used in the treatment, cure, prevention, or diagnosis of disease or used to otherwise enhance physical or mental well being. 2. (in federal law) a. any substance… …   Universalium

  • Drug — /droog/, n. Zoroastrianism. the cosmic principle of disorder and falsehood. Cf. Asha. [ < Avestan drauga] * * * I Any chemical agent that affects the function of living things. Some, including antibiotics, stimulants, tranquilizers,… …   Universalium

  • Diphenhydramine — Systematic (IUPAC) name 2 (diphenylmethoxy) N,N dimethylethanamine Clinical data Trade names Benadryl …   Wikipedia

  • Recreational drug use — is the use of a drug, usually psychoactive, with the intention of creating or enhancing recreational experience. Such use is controversial, however, often being considered to be also drug abuse, and it is often illegal. Also, it may overlap with… …   Wikipedia

  • Clemastine — Systematic (IUPAC) name (2R) 2 {2 [(1R) 1 (4 chlorophenyl) 1 phenylethoxy]ethyl} 1 methylpyrrolidine Clinical data Trade names …   Wikipedia

  • Urticaria — Hives redirects here. For other uses, see Hive (disambiguation). Urticaria Classification and external resources Urticaria on the arm ICD 10 L …   Wikipedia

  • Hydroxyzine — Systematic (IUPAC) name (±) 2 (2 {4 [(4 chlorophenyl) phe …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”