Buy Cyclosporine (Neoral, Atopica, Restasis) online

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NEORAL (CYCLOSPORINE) CAPSULES AND ORAL SOLUTION: PHARMACOKINETICS

The immunosuppressive activity of cyclosporine is primarily due to parent drug. Following oral administration, absorption of cyclosporine is incomplete. The extent of absorption of cyclosporine is dependent on the individual patient, the patient population, and the formulation. Elimination of cyclosporine is primarily biliary with only 6% of the dose (parent drug and metabolites) excreted in urine. The disposition of cyclosporine from blood is generally biphasic, with a terminal half-life of approximately 8.4 hours (range 5-18 hours). Following intravenous administration, the blood clearance of cyclosporine (assay: HPLC) is approximately 5-7 mL/min/kg in adult recipients of renal or liver allografts. Blood cyclosporine clearance appears to be slightly slower in cardiac transplant patients.

The Neoral Soft Gelatin Capsules (cyclosporine capsules, USP) and Neoral Oral Solution (cyclosporine oral solution, USP) are bioequivalent. Neoral Oral Solution diluted with orange juice or apple juice is bioequivalent to Neoral Oral Solution diluted with water. The effect of milk on the bioavailability of cyclosporine when administered as Neoral Oral Solution has not been evaluated.

The relationship between administered dose and exposure (area under the concentration versus time curve, AUC) is linear within the therapeutic dose range. The intersubject variability (total, %CV) of cyclosporine exposure (AUC) when Neoral or Sandimmune is administered ranges from approximately 20% to 50% in renal transplant patients. This intersubject variability contributes to the need for individualization of the dosing regimen for optimal therapy. Intrasubject variability of AUC in renal transplant recipients (%CV) was 9%-21% for Neoral and 19%-26% for Sandimmune. In the same studies, intrasubject variability of trough concentrations (%CV) was 17%-30% for Neoral and 16%-38% for Sandimmune.

Absorption

Neoral has increased bioavailability compared to Sandimmune. The absolute bioavailability of cyclosporine administered as Sandimmune is dependent on the patient population, estimated to be less than 10% in liver transplant patients and as great as 89% in some renal transplant patients. The absolute bioavailability of cyclosporine administered as Neoral has not been determined in adults. In studies of renal transplant, rheumatoid arthritis and psoriasis patients, the mean cyclosporine AUC was approximately 20% to 50% greater and the peak blood cyclosporine concentration (Cmax) was approximately 40% to 106% greater following administration of Neoral compared to following administration of Sandimmune. The dose normalized AUC in de novo liver transplant patients administered Neoral 28 days after transplantation was 50% greater and Cmax was 90% greater than in those patients administered Sandimmune. AUC and Cmax are also increased (Neoral relative to Sandimmune) in heart transplant patients, but data are very limited. Although the AUC and Cmax values are higher on Neoral relative to Sandimmune, the pre-dose trough concentrations (dose-normalized) are similar for the two formulations.

Following oral administration of Neoral, the time to peak blood cyclosporine concentrations (Tmax) ranged from 1.5-2.0 hours. The administration of food with Neoral decreases the cyclosporine AUC and Cmax. A high fat meal (669 kcal, 45 grams fat) consumed within one-half hour before Neoral administration decreased the AUC by 13% and Cmax by 33%. The effects of a low fat meal (667 kcal, 15 grams fat) were similar.

The effect of T-tube diversion of bile on the absorption of cyclosporine from Neoral was investigated in eleven de novo liver transplant patients. When the patients were administered Neoral with and without T-tube diversion of bile, very little difference in absorption was observed, as measured by the change in maximal cyclosporine blood concentrations from pre-dose values with the T-tube closed relative to when it was open: 6.9±41% (range -55% to 68%).

Distribution

Cyclosporine is distributed largely outside the blood volume. The steady state volume of distribution during intravenous dosing has been reported as 3-5 L/kg in solid organ transplant recipients. In blood, the distribution is concentration dependent. Approximately 33%-47% is in plasma, 4%-9% in lymphocytes, 5%-12% in granulocytes, and 41%-58% in erythrocytes. At high concentrations, the binding capacity of leukocytes and erythrocytes becomes saturated. In plasma, approximately 90% is bound to proteins, primarily lipoproteins. Cyclosporine (Neoral) is excreted in human milk.

Metabolism

Cyclosporine is extensively metabolized by the cytochrome P-450 3A enzyme system in the liver, and to a lesser degree in the gastrointestinal tract, and the kidney. The metabolism of cyclosporine can be altered by the co-administration of a variety of agents. At least 25 metabolites have been identified from human bile, feces, blood, and urine. The biological activity of the metabolites and their contributions to toxicity are considerably less than those of the parent compound. The major metabolites (M1, M9, and M4N) result from oxidation at the 1-beta, 9-gamma, and 4-N-demethylated positions, respectively. At steady state following the oral administration of Sandimmune, the mean AUCs for blood concentrations of M1, M9, and M4N are about 70%, 21%, and 7.5% of the AUC for blood cyclosporine concentrations, respectively. Based on blood concentration data from stable renal transplant patients (13 patients administered Neoral and Sandimmune in a crossover study), and bile concentration data from de novo liver transplant patients (4 administered Neoral, 3 administered Sandimmune), the percentage of dose present as M1, M9, and M4N metabolites is similar when either Neoral or Sandimmune is administered.

Excretion

Only 0.1% of a cyclosporine dose is excreted unchanged in the urine. Elimination is primarily biliary with only 6% of the dose (parent drug and metabolites) excreted in the urine. Neither dialysis nor renal failure alter cyclosporine clearance significantly.

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