Pharmacotherapeutic group: Drugs used in type 2 diabetes, dipeptidyl peptidase 4 (DPP4) inhibitors.
ATC code: A10BH07 evogliptin.
Pharmacology: Pharmacodynamics: Mechanism of action: Evogliptin is a member of a class of oral anti-hyperglycaemic agents called DPP-4 inhibitors. Evogliptin selectively inhibits the activity of DPP-4 by reversibly binding to DPP-4, an enzyme that inactivates incretin hormones such as GLP-1 (Glucagon-like peptide-1). Evogliptin dose-dependently inhibits the activity of DPP-4, thereby blocking GLP-1 from being inactivated by DPP-4, increasing the concentration of endogenous active GLP-1 and prolonging its action, and improves glucose-dependent insulin secretion in pancreatic beta cells by GLP-1, and suppresses increase in blood sugar. The IC50 of evogliptin against recombinant human DPP-4 was 0.980 nM, and the inhibitory constant (Ki) was 0.525 nM. Compared to DPP-8 and DPP-9, evogliptin showed high selectivity of about 7,898 times and about 6,058 times, respectively, to DPP-4 (in vitro).
Information on clinical trial: Monotherapy: A randomized, double-blinded, placebo-controlled, 24-week (extension up to 52 weeks) clinical trial to investigate the efficacy and safety of evoglitpin monotherapy was performed in 160 patients with type 2 diabetes mellitus who have inadequate glycemic control on diet and exercise. When administering evogliptin orally, once daily, the difference of changes in hemoglobin A1C (HbA1c) between evogliptin verses placebo from baseline to 24 weeks of treatment was statistically significant (p<0.0001) (Table 1).
In the extension period up to 52 weeks, for patients who agreed to participate in the extension period (placebo arm was switched to evogliptin 5 mg), the efficacy of evogliptin, in terms of HbA1c, was maintained up to 52 weeks (Evogliptin/Evogliptin group showed -0.36% of HbA1c from the baseline). (See Table 1.)
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Combination therapy: Evogliptin add on to metformin monotherapy: A randomized, double-blind, active-controlled clinical trial to investigate the efficacy and safety of evogliptin when added to ongoing metformin monotherapy (≥1,000 mg/day) was performed in 222 patients with type 2 diabetes mellitus who have inadequate glycemic control with metformin monotherapy. When adding on evogliptin, orally, once daily, the difference of changes in HbA1c from baseline to 24 weeks was similar to that of sitagliptin 100 mg; the non-inferiority of evogliptin to sitagliptin was demonstrated in patients with type 2 diabetes mellitus who have inadequate glycemic control with metformin monotherapy (Table 2).
In the extension period up to 52 weeks, for patients who agreed to participate in the extension period (sitagliptin 100 mg arm was switched to evogliptin 5 mg), the efficacy of evogliptin, in terms of HbA1c, was maintained up to 52 weeeks (Evogliptin/Evogliptin group showed -0.44% of HbA1c from the baseline). (See Table 2.)
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Evogliptin add on to metformin and dapagliflozin combination therapy: A 24-week (extension period up to 52 weeks), multicenter, double-blind, placebo-controlled, randomized, parallel, clinical trial to evaluate the efficacy and safety of evogliptin when added to stable doses of metformin and dapagliflozin combination therapy was performed in 283 patients with type 2 diabetes (7.0% ≤HbA1c ≤10.5%) who have inadequate glycemic control with metformin and dapagliflozin combination therapy.
After 24 weeks, the least squares mean (LSmean) for HbA1c (%) change from baseline was -0.69% in evogliptin 5 mg and -0.04% in placebo. The difference of changes in HbA1c from baseline between the groups was -0.65% (95% CI: -0.79, -0.51), which showed a higher reduction in evogliptin 5 mg when compared to placebo. The difference was statistically significant (p<0.0001) (Table 3). In extension period up to 52 weeks, the effect of evogliptin 5 mg maintained, in terms of HbA1c, when compared with placebo. (See Table 3.)
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Pharmacokinetics: Absorption: After a single oral administration of evogliptin 5 mg in fasting state, the maximum blood concentration reached in about 4 hours. In repeated oral administration, steady state reached in 48 hours after the first administration. Comparing the bioavailability of evogliptin 10 mg between fast state and fed state (high-fat meal), it was found that there is no food effect in terms of bioavailability of evogliptin.
Distribution: Evogliptin is widely distributed to tissues after administration. When reacting evogliptin in heparin-treated plasma of mice, rats, dogs, and humans, the plasma protein binding rates of evogliptin were about 63%, about 25%, about 43%, and about 46%, respectively; binding rates were not related to the concentration of evogliptin in the reacted range (100-1,000 ng/mL). In pregnant female rats and rabbits or lactating rats, the concentration of evogliptin in fetal plasma or milk increased maternal exposure dependently.
Metabolism: Metabolic stability of evogliptin was confirmed in in vitro tests using liver microsomes or hepatocytes. Evogliptin circulates in plasma mainly as parent, and the major metabolites are M16, M8, M7, and M13. The main metabolic pathways were hydroxylation (M7, M8), sulfation (M13) by CYP3A4 and glucuronidation by UGT2B7 (M7-M16). The major metabolites M16, M8, M7, and M13 were all identified as active forms, but showed at least 110 times lower DPP-4 inhibitory activity compared to the evogliptin parent. Therefore, considering the blood exposure level and inhibitory activity of major metabolites, it is very unlikely that the metabolites will reach effective blood levels.
Excretion: After a single oral administration of evogliptin 5 mg in fasting state, the mean half-life (t
½) of elimination was about 32.5 hours. After a single oral administration of [14C]-evogliptin 5 mg in fasting state, 74.9% to 93.9% were excreted through urine and feces, respectively. The average excretion rates in urine and feces were 46.1% and 42.8%, respectively, and the main excretory body was the evogliptin parent.
Characteristics in patients: Hepatic impairment: After a single oral administration of evogliptin 5 mg, the exposure of evogliptin, evaluated by C
max and AUC
last, was observed similarly between patients with mild liver dysfunction (Child-Pugh A) and healthy adults with normal liver function when matching with sex, age and weight. In patients with moderate hepatic dysfunction (Child-Pugh B), C
max and AUC
last were about 1.37 times and about 1.44 times, respectively, compared to healthy adults with normal liver function. However, these pharmacokinetic differences are not considered to have a clinically significant effect.
Renal impairment: After a single oral administration of evogliptin 5 mg, patients with mild renal impairment (60≤MDRD eGFR(mL/min/1.73m
2)<90) had blood exposure similar to those of healthy adults with normal renal function (90≤MDRD eGFR(mL/min/1.73m
2)). In patients with moderate renal impairment (30≤MDRD eGFR(mL/min/1.73m
2)<60) and patients with severe renal impairment (15≤MDRD eGFR(mL/min/1.73m
2)<30)), the AUC was about 1.8 times and about 1.98 times, and C
max about 1.32 times and about 1.52 times, respectively, compared to healthy adults with normal renal function. However, these pharmacokinetic differences are not considered to have a clinically significant effect.
After a single oral administration of evogliptin 5 mg before and after hemodialysis in patients with end-stage renal disease undergoing hemodialysis (MDRD eGFR(mL/min/1.73m
2)<15), the AUC was about 1.30 times (administration before dialysis) and about 1.39 times (administration after dialysis), and C
max about 0.88 times (administration before dialysis) and about 1.20 times (administration after dialysis), respectively, compared to healthy adults with normal renal function (90≤MDRD eGFR(mL/min/1.73m
2)). The AUC was about 0.95 times and Cmax was about 0.73 times, when administered before hemodialysis compared to when administered after hemodialysis. These pharmacokinetic differences are not considered to have a clinically significant effect.
Toxicology: Preclinical safety data: A safety pharmacology program compliant with GLP and ICH guidelines was conducted with evogliptin tartrate, encompassing central nervous system, respiratory, and cardiovascular systems.
A study of central nervous system effects after oral administration of evogliptin tartrate in rodents included body temperature and general behaviors including neurobehavior. Evogliptin tartrate did not produce any significant effects on general behavior and temperature at doses up to 300 mg/kg.
A study of respiratory function in rats was conducted at oral doses up to 300 mg/kg evogliptin tartrate. There were no statistically significant effects on respiratory parameters such as respiratory rate and tidal volume relative to vehicle controls, except a significant decrease in minute volume at 300 mg/kg 120 minutes after administration.
Studies in the cardiovascular system included evaluation of the human ether-à-go-go related gene (hERG) tail currents and electrocardiographic function in dogs. In the hERG patch clamp assay, the IC
50 value of evogliptin tartrate was 143.4 μM (>9,000 folds vs. C
max at the dose of 5 mg in humans from DA1229_DM_I). In dogs, evogliptin tartrate increased heart rate and changed several ECG parameters (shortened QT, QTcV and RR interval, elongated QRS interval) at 300 mg/kg, but did not affect blood pressure and temperature. These overall effects were restricted to high dose/concentration associated with evogliptin systemic exposure greatly exceeding those observed in humans.