Drug Name Zovirax

Abrupt termination of continuous treatment can be followed by rebound hypertension (particularly with short t1/2 ?-blockers). Drugs for the control of hypertensive crises include nifedipine (capsule, to be chewed and swallowed), nitroglycerin (sublingually), clonidine (p. o. or i. v. , p. 96), dihydralazine (i. v. ), diazoxide (i. v. ), fenoldopam (by infusion) and sodium nitroprusside.
Dispersion in saliva in oral cavity causes pregastric absorption from some formulations in those cases where drug dissolves quickly. Buccal, pharyngeal and gastric regions are all areas of absorption for many drugs21. Any pregastric absorption avoids first pass metabolism and can be a great advantage in drugs that undergo a great deal of hepatic metabolism.

 

The conventional (or classical) neuroleptics comprise two classes of compounds with distinctive chemical structures: 1. the phenothiazines derived from the antihistamine promethazine (prototype: chlorpromazine), including their analogues (e. g. , thioxanthenes); and 2. the butyrophenones (prototype: haloperidol).
Synthesis of prostaglandins (PG), prostacyclin, and thromboxane proceeds via intermediary cyclic endoperoxides. In the case of PG, a cyclopentane ring forms in the acyl chain.