•General anesthetic drugs:
•are drugs which produce reversible loss of Sensation and consciousness.
•General anesthetic agents can be administered by different routes: mostly Intravenous injection and inhalation
•The drugs which are given as anesthetics by I.V administration are used for specific purpose as quickly acting general anesthetics for few minutes or as a supplement with another general anesthetic agents as:
•Thiopental (I.V anesthetic agent), Nitrous oxide, ether and halothane (Inhalation agents).
•As a supplement in order to produce the induction of anesthesia in a short period, because the inhalational anesthetic agents need a time about 15-20 minutes for production of induction.
During this 15-20 minutes, the patients will start into what we called stages of general anesthesia
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