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Amitriptyline pharmacokinetics in experimental spinal cord injury in the rabbit.

Reihanikermani H, Ansari M, Soltani A, Meymandi MS - Indian J Pharm Sci (2008)

Bottom Line: Maximum concentration was observed at 6.5 h after administration in sham group with a concentration of 439.6 ng/ml, whereas in SCI group T(max) was at 2.7 h with a concentration of 2763.9 ng/ml.In SCI group, AUC was 9465.6 ng.h/ml and half life was 6 h and for control group it was 2817.4 ng.h/ml and 6.4 h, respectively.Statistical analysis of data showed that SCI didn't induce significant changes in amitriptyline pharmacokinetic parameters.

View Article: PubMed Central - PubMed

Affiliation: Department of Neurosurgery, Bahonar Hospital and Neuroscience Research Center, Kerman Medical Sciences University, Kerman, Iran.

ABSTRACT
Previous studies have demonstrated that pharmacokinetic behavior of several drugs such as paracetamol, theophylline, and aminoglycosides are significantly altered in spinal cord injured patients. No pharmacokinetic study of amitriptyline has been performed in patients and experimental models of spinal cord injury. Pharmacokinetic parameters of amitriptyline in orally treated rabbits subjected to laminectomy and spinal cord injury compared with those underwent laminectomy alone. Among twenty four male rabbits were included in this study, nine of them subjected to spinal cord injury at the 8(th) thoracic level by knife severance method and six rabbits underwent laminectomy alone (sham group) and nine rabbits treated as control. All received a single oral dose of amitriptyline (20 mg/kg) 24 h after injury. Blood sampling were done at predetermined times to 36 h after drug administration. Amitriptyline concentration in serum samples was determined by high-performance liquid chromatography. Pharmacokinetic parameters including maximum concentration (C(max)), time to reach maximum concentration (T(max)), half life, and the area under the curve to last detectable concentration time point (AUC(0-t)) were directly determined from the concentration-time curve. Maximum concentration was observed at 6.5 h after administration in sham group with a concentration of 439.6 ng/ml, whereas in SCI group T(max) was at 2.7 h with a concentration of 2763.9 ng/ml. In control group it was 3.3 h and 396 ng/ml, respectively. In SCI group, AUC was 9465.6 ng.h/ml and half life was 6 h and for control group it was 2817.4 ng.h/ml and 6.4 h, respectively. Statistical analysis of data showed that SCI didn't induce significant changes in amitriptyline pharmacokinetic parameters.

No MeSH data available.


Related in: MedlinePlus

Concentration-time profile of amitriptyline in rabbitsThe profile obtained from administration of amitriptyline to (–▪–) SCI and (–•–) control groups of rabbits. Each point represents mean±SEM
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Figure 0001: Concentration-time profile of amitriptyline in rabbitsThe profile obtained from administration of amitriptyline to (–▪–) SCI and (–•–) control groups of rabbits. Each point represents mean±SEM

Mentions: All the animals studied exhibited locomotor activity before the initiation of the study. After surgical procedure, injured rabbits showed complete flaccid paraplegia and five of them had watery stool after 12 h, whereas sham-injured animals exhibited normal walk after recovery from anesthesia. Serum amitriptyline concentrations observed at various times with a single oral dose of 20 mg/kg administered after SCI and under control conditions are shown in fig. 1. This figure indicates that Cmax was observed at 3.3 h after administration in control group with a concentration of 396.0 ng/ml, whereas Cmax in SCI group was appeared at 2.7 h with a concentration of 2763.9 ng/ml. These pharmacokinetic parameters are higher and variable in SCI group than control group. Pharmacokinetic parameters are shown in Table 1.


Amitriptyline pharmacokinetics in experimental spinal cord injury in the rabbit.

Reihanikermani H, Ansari M, Soltani A, Meymandi MS - Indian J Pharm Sci (2008)

Concentration-time profile of amitriptyline in rabbitsThe profile obtained from administration of amitriptyline to (–▪–) SCI and (–•–) control groups of rabbits. Each point represents mean±SEM
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3040874&req=5

Figure 0001: Concentration-time profile of amitriptyline in rabbitsThe profile obtained from administration of amitriptyline to (–▪–) SCI and (–•–) control groups of rabbits. Each point represents mean±SEM
Mentions: All the animals studied exhibited locomotor activity before the initiation of the study. After surgical procedure, injured rabbits showed complete flaccid paraplegia and five of them had watery stool after 12 h, whereas sham-injured animals exhibited normal walk after recovery from anesthesia. Serum amitriptyline concentrations observed at various times with a single oral dose of 20 mg/kg administered after SCI and under control conditions are shown in fig. 1. This figure indicates that Cmax was observed at 3.3 h after administration in control group with a concentration of 396.0 ng/ml, whereas Cmax in SCI group was appeared at 2.7 h with a concentration of 2763.9 ng/ml. These pharmacokinetic parameters are higher and variable in SCI group than control group. Pharmacokinetic parameters are shown in Table 1.

Bottom Line: Maximum concentration was observed at 6.5 h after administration in sham group with a concentration of 439.6 ng/ml, whereas in SCI group T(max) was at 2.7 h with a concentration of 2763.9 ng/ml.In SCI group, AUC was 9465.6 ng.h/ml and half life was 6 h and for control group it was 2817.4 ng.h/ml and 6.4 h, respectively.Statistical analysis of data showed that SCI didn't induce significant changes in amitriptyline pharmacokinetic parameters.

View Article: PubMed Central - PubMed

Affiliation: Department of Neurosurgery, Bahonar Hospital and Neuroscience Research Center, Kerman Medical Sciences University, Kerman, Iran.

ABSTRACT
Previous studies have demonstrated that pharmacokinetic behavior of several drugs such as paracetamol, theophylline, and aminoglycosides are significantly altered in spinal cord injured patients. No pharmacokinetic study of amitriptyline has been performed in patients and experimental models of spinal cord injury. Pharmacokinetic parameters of amitriptyline in orally treated rabbits subjected to laminectomy and spinal cord injury compared with those underwent laminectomy alone. Among twenty four male rabbits were included in this study, nine of them subjected to spinal cord injury at the 8(th) thoracic level by knife severance method and six rabbits underwent laminectomy alone (sham group) and nine rabbits treated as control. All received a single oral dose of amitriptyline (20 mg/kg) 24 h after injury. Blood sampling were done at predetermined times to 36 h after drug administration. Amitriptyline concentration in serum samples was determined by high-performance liquid chromatography. Pharmacokinetic parameters including maximum concentration (C(max)), time to reach maximum concentration (T(max)), half life, and the area under the curve to last detectable concentration time point (AUC(0-t)) were directly determined from the concentration-time curve. Maximum concentration was observed at 6.5 h after administration in sham group with a concentration of 439.6 ng/ml, whereas in SCI group T(max) was at 2.7 h with a concentration of 2763.9 ng/ml. In control group it was 3.3 h and 396 ng/ml, respectively. In SCI group, AUC was 9465.6 ng.h/ml and half life was 6 h and for control group it was 2817.4 ng.h/ml and 6.4 h, respectively. Statistical analysis of data showed that SCI didn't induce significant changes in amitriptyline pharmacokinetic parameters.

No MeSH data available.


Related in: MedlinePlus