The pharmacokinetics of alogliptin is similar in healthy individuals and in patients with type 2 diabetes mellitus.
Suction
The absolute bioavailability of alogliptin is approximately 100%. Simultaneous reception with food with a high fat content did not affect the area under the curve "concentration-time" (AUC) alogliptin, so it can be taken regardless of food intake.
In healthy individuals, after a single oral intake of up to 800 mg of alogliptin, fast absorption of the drug is noted with the achievement of average maximum concentration (mean TCmOh) in the interval from 1 to 2 hours from the moment of reception.
Neither healthy volunteers nor patients with type 2 diabetes had a clinically significant cumulation of alogliptin after repeated administration.
AUC Alogliptin proportionally increases with a single admission in the therapeutic range of doses from 6.25 mg to 100 mg. Coefficient of variability AUC Alogliptin among patients is small (17%).
AUC (0-inf) Alogliptin after a single dose was similar to AUC (0-24) after taking the same dose once a day for 6 days. This indicates the absence of time dependence in the kinetics of alogliptin after repeated administration.
Distribution
After a single intravenous injection of alogliptin at a dose of 12.5 mg in healthy volunteers, the volume of distribution in the terminal phase was 417 liters, indicating that alogliptin well distributed in tissues. The connection with plasma proteins is approximately 20-30%.
Metabolism
Alogliptin is not subjected to intensive metabolism, from 60 to 70% of alogliptin is excreted unchanged by the kidneys.
After the introduction 14C-labeled alogliptin inside, two major metabolites were identified: N-demethylated alogliptin, M-I (<1% of the starting material), and N-acetylated alogliptin, M-II (<6% of the starting material). M-I is an active metabolite and a highly selective inhibitor of DPP-4, similar in action to the alglyptine itself; M-II does not show an inhibitory activity against DPP-4 or other DPP enzymes.
In studies in vitro it was revealed that CYP2D6 and CYP3A4 participate in the limited metabolism of alogliptin.
Also research in vitro show that alogliptin does not induce CYP1A2, CYP2C9, CYP2B6 and does not inhibit CYP1A2, CYP2B6, CYP2C8, CYP2C9, CYP2C19, CYP2D6 or CYP3A4 in concentrations reached at the recommended dose of 25 mg of alogliptin. In conditions in vitro Alogliptin can induce to a small extent CYP3A4, but in in vivo alogliptin does not induce CYP3A4.
Alogliptin does not inhibit kidney transporter of organic human anions (OAT1), third (OATZ) types and kidney transporter of organic cations of the second (OCT2) type.
Alogliptin exists mainly in the form of (R) -enantiomer (> 99%) and under conditions in vivo or in small amounts, or not at all subjected to a chiral transformation in (S) -enantiomer. (S) -enantiomer is not detected when taking alogliptin in therapeutic doses.
Excretion
After oral administration 14C-labeled alogliptin 76% of the total radioactivity was excreted by the kidneys and 13% by the intestine.
The average renal clearance of alogliptin (170 ml / min) is greater than the average glomerular filtration rate (about 120 ml / min), suggesting that alogliptin partially excreted by active renal excretion. The mean terminal half-life of alogliptin (T1/2) is approximately 21 hours.
Pharmacokinetics in selected patient groups
Patients with renal insufficiency
A study of alogliptin at a dose of 50 mg per day was performed in patients with varying degrees of severity of chronic renal failure. Patients included in the study were divided into 4 groups according to the Cockcroft-Gault formula: patients with mild (creatinine clearance from 50 to 80 ml / min), moderate (creatinine clearance from 30 to 50 ml / min) and severe renal failure (creatinine clearance less than 30 ml / min), as well as patients with terminal stage of chronic renal failure who need hemodialysis.
AUC Alogliptin in patients with mild renal insufficiency increased approximately 1.7 times in comparison with the control group. Nevertheless, this increase AUC was within the permissible deviation for the control group, so dose adjustment in such patients is not required (see Dosage and Administration). Increase AUC Alogliptin approximately twice as compared with the control group was observed in patients with moderate renal insufficiency. Approximately fourfold increase AUC was noted in patients with severe renal insufficiency, as well as in patients with terminal stage of chronic renal failure compared with the control group. (Patients with terminal stage of renal failure underwent hemodialysis immediately after taking alogliptin. % doses were removed from the body during a 3-hour dialysis session.)
Thus, in order to achieve a therapeutic concentration of alogliptin in blood plasma similar to that in patients with normal renal function, dose adjustment is necessary in patients with moderate renal insufficiency (see Dosage and Administration). Alogliptin It is not recommended for patients with severe renal failure, as well as with terminal stage of renal failure requiring hemodialysis.
Patients with hepatic insufficiency
In patients with moderate hepatic impairment AUC and CmOh alogliptin decrease by approximately 10% and 8%, respectively, compared with patients with normal liver function. These values are clinically insignificant. Thus, the correction of the dose for mild to moderate severity of liver failure (5 to 9 points on the Child-Pugh) is not required. No clinical data are alogliptina in patients with severe liver failure (more than 9 points on the Child-Pugh, cm. Dosing and dose).
Other patient groups
Age (65-81 years), gender, race, body weight of patients no clinically significant effects on pharmacokinetic parameters alogliptina. Correction of the dose of the drug is not required (see Dosage and Administration).
Pharmacokinetics in children under 18 years of age have not been studied.