Drug Name Atarax

Thyroid overactivity in Graves’ disease (A) results from formation of IgG antibodies that bind to and activate TSH receptors. Consequently, there is overproduction of hormone with cessation of TSH secretion. Graves’ disease can abate spontaneously after 1–2 y. Therefore, initial therapy consists of reversible suppression of thyroid activity by means of antithyroid drugs.
Derivatives with a different substituent on 6-APA possess advantages (B): (1) Acid resistance permits oral administration, provided that enteral absorption is possible. All derivatives shown in (B) can be given orally. Penicillin V (phenoxymethylpenicillin) exhibits antibacterial properties similar to those of penicillin G.

 

Mg2+ ions are also believed to promote release from the duodenal mucosa of cholecystokinin/pancreozymin, a polypeptide that also stimulates peristalsis. These so-called saline cathartics elicit a watery bowel discharge 1–3 h after administration (preferably in isotonic solution). They are used to purge the bowel (e. g. , before bowel surgery) or to hasten the elimination of ingested poisons.
The rapid cessation of action is largely due to redistribution: after intravenous injection, brain concentration climbs rapidly to anesthetic levels because of the high cerebral blood flow; the drug then distributes evenly in the body, i. e. , concentration rises in the periphery, but falls in the brain—redistribution and cessation of anesthesia (A).