
Ketamine
(±)-2-(o-Chlorophenyl)-2-(methylamino) cyclohexanone hydrochloride
Absorption
Ketamine is rapidly absorbed. Mean C max is 0.75 mcg/mL. T max is 1 h.
Distribution
Distribution t ½ is approximately 10 to 15 min. Ketamine is rapidly distributed into body tissues, with high concentrations in body fat, liver, lungs, and brain. Protein binding with this drug is not significant.
Metabolism
Undergoes N-demethylation and hydroxylation of cyclohexone ring. The N-demethylated metabolite is less than 1/ 6 as potent and the demethyl cyclohexone derivative is less than 1/ 10 as potent as the drug.
Elimination
Elimination t ½ is 2.5 h. Approximately 91% is excreted in urine and 3% in feces.
Halothane
Decreased cardiac output, BP, and pulse.
Tubocurarine and other nondepolarizing muscle relaxants
Increased neuromuscular effects, resulting in prolonged respiratory depression.
Incompatibility
Ketamine is physically incompatible with diazepam and barbiturates.
2. 本品要緩慢IV注射投與(須超過1分鐘),避免造成過度的呼吸抑制和高血壓,不要IV注射濃度為100mg/ml,也不可以沒有滅菌的水、生理食鹽或葡萄糖溶液稀釋者。
3. 不要將ketamine與使用過barbiturates的注射器混合,因為會造成化學性的配合禁忌。




