Pharmacotherapeutic group: Combinations of oral blood glucose lowering drugs.
ATC code: A10BD19.
Pharmacology: Pharmacodynamics: Mechanism of action: Combination empagliflozin/linagliptin: Empagliflozin and linagliptin act by separate and complementary mechanisms to treat type 2 diabetes mellitus (TD2M). The combination of empagliflozin and linagliptin, after single oral dosing, showed a superior effect on glycaemic control (oral glucose tolerance test) as compared to the respective monotherapies tested in diabetic ZDF rats.
Empagliflozin: Empagliflozin is a reversible competitive inhibitor of SGLT2 with an IC50 of 1.3 nM. It has a 5000-fold selectivity over human SGLT1 (IC50 of 6278 nM), responsible for glucose absorption in the gut.
SGLT2 is highly expressed in the kidney, whereas expression in other tissues is absent or very low. It is responsible as the predominant transporter for re-absorption of glucose from the glomerular filtrate back into the circulation. In patients with T2DM and hyperglycaemia a higher amount of glucose is filtered and reabsorbed.
Empagliflozin improves glycaemic control in patients with T2DM by reducing renal glucose reabsorption. The amount of glucose removed by the kidney through this glucuretic mechanism is dependent upon the blood glucose concentration and glomerular filtration rate (GFR). Through inhibition of SGLT2 in patients with T2DM and hyperglycaemia, excess glucose is excreted in the urine.
In patients with T2DM, urinary glucose excretion increased immediately following the first dose of empagliflozin and is continuous over the 24 hour dosing interval. Increased urinary glucose excretion was maintained at the end of 4-week treatment period, averaging approximately 78 g/day with 25 mg empagliflozin once daily. Increased urinary glucose excretion resulted in an immediate reduction in plasma glucose levels in patients with T2DM.
Empagliflozin improves both fasting and post-prandial plasma glucose levels.
The insulin independent mechanism of action of empagliflozin contributes to a low risk of hypoglycaemia.
The effect of empagliflozin in lowering blood glucose is independent of beta cell function and insulin pathway. Improvement of surrogate markers of beta cell function including Homeostasis Model Assessment-β (HOMA-β) and proinsulin to insulin ratio were noted. In addition urinary glucose excretion triggers calorie loss, associated with body fat loss and body weight reduction.
The glucosuria observed with empagliflozin is accompanied by mild diuresis which may contribute to sustained and moderate reduction of blood pressure (BP).
Linagliptin: Linagliptin is an inhibitor of the enzyme DPP-4 an enzyme which is involved in the inactivation of the incretin hormones GLP-1 and GIP (glucagon-like peptide-1, glucose-dependent insulinotropic polypeptide). These hormones are rapidly degraded by the enzyme DPP-4. Both incretin hormones are involved in the physiological regulation of glucose homeostasis. Incretins are secreted at a low basal level throughout the day and levels rise immediately after meal intake. GLP-1 and GIP increase insulin biosynthesis and secretion from pancreatic beta cells in the presence of normal and elevated blood glucose levels. Furthermore GLP-1 also reduces glucagon secretion from pancreatic alpha cells, resulting in a reduction in hepatic glucose output. Linagliptin binding to DPP-4 is reversible but long lasting and thus leads to a sustained increase and a prolongation of active incretin levels.
In vitro, linagliptin inhibits DPP-4 with nanomolar potency and exhibits a >10000 fold selectivity versus DPP-8 or DPP-9 activity.
Clinical trials: A total of 2173 patients with T2DM and inadequate glycaemic control were treated in clinical studies to evaluate the safety and efficacy of GLYXAMBI; 1005 patients were treated with empagliflozin 10 or 25 mg, and linagliptin 5 mg. In clinical trials, patients were treated for up to 24 or 52 weeks.
GLYXAMBI added to metformin: In a factorial design study, patients inadequately controlled on metformin (mean daily dose 1889.0 (± 470.9) mg at baseline), 24-weeks treatment with GLYXAMBI 10 mg/5 mg and GLYXAMBI 25 mg/5 mg provided statistically significant improvements in HbA
1c and fasting plasma glucose (FPG) compared to linagliptin 5 mg alone and also compared to empagliflozin 10 or 25 mg alone. Compared to linagliptin 5 mg GLYXAMBI provided statistically significant improvements in body weight. A greater proportion of patients with a baseline HbA
1c ≥7.0% and treated with GLYXAMBI achieved a target HbA
1c of <7% compared to the individual components (Table 1).
After 24 weeks' treatment with GLYXAMBI, both systolic (SBP) and diastolic blood pressures (DBP) were reduced, -5.6/-3.6 mmHg (p<0.001 versus linagliptin 5 mg for SBP and DBP) for GLYXAMBI 25 mg/ 5 mg and -4.1/-2.6 mmHg (p<0.05 versus linagliptin 5 mg for SBP, n.s. for DBP) for GLYXAMBI 10 mg/ 5 mg.
Clinically meaningful reductions in HbA1c (Table 1) and both systolic and diastolic blood pressures were observed at week 52, -3.8/-1.6 mmHg (p<0.05 versus linagliptin 5 mg for SBP and DBP) for GLYXAMBI 25 mg/ 5 mg and -3.1/-1.6 mmHg (p<0.05 versus linagliptin 5 mg for SBP, n.s. for DBP) for GLYXAMBI 10 mg/ 5 mg.
After 24 weeks, rescue therapy was used in 1 (0.7%) patient treated with GLYXAMBI 25 mg/5 mg and in 3 (2.2%) patients treated with GLYXAMBI 10 mg/5 mg, compared to 4 (3.1%) patients treated with linagliptin 5 mg and 6 (4.3%) patients treated with empagliflozin 25 mg and 1 (0.7%) patient treated with empagliflozin 10 mg. (See Table 1.)
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In a pre-specified subgroup of patients with baseline HbA
1c greater or equal than 8.5% the reduction from baseline in HbA
1c with GLYXAMBI 25 mg/5 mg was -1.8% at 24 weeks (p<0.0001 versus linagliptin 5 mg, p<0.001 versus empagliflozin 25 mg) and -1.8% at 52 weeks (p<0.0001 versus linagliptin 5 mg, p<0.05 versus empagliflozin 25 mg) and with GLYXAMBI 10 mg/5 mg -1.6% at 24 weeks (p<0.01 versus linagliptin 5 mg, n.s. versus empagliflozin 10 mg) and -1.5% at 52 weeks (p<0.01 versus linagliptin 5 mg, n.s. versus empagliflozin 10 mg).
GLYXAMBI in treatment-naïve patients: In a factorial design study, after 24-weeks treatment, GLYXAMBI 25 mg/5 mg in treatment naïve patients provided statistically significant improvement in HbA
1c compared to linagliptin 5 mg, but there was no statistically significant difference between GLYXAMBI 25 mg/5 mg and empagliflozin 25 mg (Table 2). GLYXAMBI 10 mg/5 mg had a 0.4% decrease in HbA
1c as compared to empagliflozin 10 mg. Compared to linagliptin 5 mg both doses of GLYXAMBI provided statistically relevant improvements in body weight. After 24 weeks' treatment with GLYXAMBI, both systolic and diastolic blood pressures were reduced, -2.9/-1.1 mmHg (n.s. versus linagliptin 5 mg for SBP and DBP) for GLYXAMBI 25 mg/ 5 mg and -3.6/-0.7 mmHg (p<0.05 versus linagliptin 5 mg for SBP, n.s. for DBP) for GLYXAMBI 10 mg/ 5 mg. Rescue therapy was used in 2 (1.5%) patients treated with GLYXAMBI 25 mg/5 mg and in 1 (0.7%) patient treated with GLYXAMBI 10 mg / 5 mg compared to 11 (8.3%) patients treated with linagliptin 5 mg, 1 (0.8%) patient treated with empagliflozin 25 mg and 4 (3.0%) patients treated with empagliflozin 10 mg. (See Table 2.)
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In a pre-specified subgroup of patients with baseline HbA
1c greater or equal than 8.5%, the reduction from baseline in HbA
1c with GLYXAMBI 25 mg/5 mg was -1.9% at 24 weeks (p<0.0001 versus linagliptin 5 mg, n.s. versus empagliflozin 25 mg) and -2.0% at 52 weeks (p<0.0001 versus linagliptin 5 mg, p<0.05 versus empagliflozin 25 mg) and with GLYXAMBI 10 mg/5 mg -1.9% at 24 weeks (p<0.0001 versus linagliptin 5 mg, p<0.05 versus empagliflozin 10 mg) and -2.0% at 52 weeks (p<0.0001 versus linagliptin 5 mg, p<0.05 versus empagliflozin 10 mg).
Empagliflozin in patients inadequately controlled on metformin and linagliptin: In patients inadequately controlled on metformin (mean daily dose 1975.7 (± 457.7) mg at baseline), and linagliptin 5 mg, 24-weeks treatment with both empagliflozin 10 mg/linagliptin 5 mg and empagliflozin 25 mg/linagliptin 5 mg provided statistically significant improvements in HbA
1c, FPG and body weight compared to placebo/linagliptin 5 mg. A statistically significant difference in the number of patients with a baseline HbA
1c ≥7.0% and treated with both doses of empagliflozin/linagliptin achieved a target HbA
1c of <7% compared to placebo/linagliptin 5 mg (Table 3). After 24 weeks' treatment with empagliflozin/linagliptin, both systolic and diastolic blood pressures were reduced, -2.6/-1.1 mmHg (n.s. versus placebo for SBP and DBP) for empagliflozin 25 mg/linagliptin 5 mg and -1.3/-0.1 mmHg (n.s. versus placebo for SBP and DBP) for empagliflozin 10 mg/linagliptin 5 mg.
After 24 weeks, rescue therapy was used in 4 (3.6%) patients treated with empagliflozin 25 mg/linagliptin 5 mg and in 2 (1.8%) patients treated with empagliflozin 10 mg/linagliptin 5 mg, compared to 13 (12.0%) patients treated with placebo/linagliptin 5 mg. (See Table 3.)
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In a pre-specified subgroup of patients with baseline HbA
1c greater or equal than 8.5% the reduction from baseline in HbA
1c with empagliflozin 25 mg/linagliptin 5 mg was -1.3% at 24 weeks (p<0.0001 versus placebo+linagliptin 5 mg) and with empagliflozin 10 mg/linagliptin 5 mg -1.3% at 24 weeks (p<0.0001 versus placebo+linagliptin 5 mg).
Linagliptin 5 mg in patients inadequately controlled on empagliflozin 10 mg and metformin: In patients inadequately controlled on empagliflozin 10 mg and metformin (mean daily dose 2101.8 (± 478.6) mg at baseline), 24-weeks treatment with empagliflozin 10 mg/linagliptin 5 mg provided statistically significant improvements in HbA
1c and FPG compared to placebo/empagliflozin 10 mg. Compared to placebo/empagliflozin 10 mg, empagliflozin 10 mg/linagliptin 5 mg provided similar results on body weight. A statistically significantly greater proportion of patients with a baseline HbA
1c ≥7.0% and treated with the empagliflozin 10 mg/linagliptin 5 mg achieved a target HbA
1c of <7% compared to placebo/empagliflozin 10 mg (Table 4). After 24 weeks' treatment with empagliflozin 10 mg/linagliptin 5 mg, both systolic and diastolic blood pressures were similar to placebo/empagliflozin 10 mg (n.s. for SBP and DBP).
After 24 weeks, rescue therapy was used in 2 (1.6%) patients treated with empagliflozin 10 mg/linagliptin 5 mg and in 5 (4.0%) patients treated with placebo/empagliflozin 10 mg.
In a pre-specified subgroup of patients (n=66) with baseline HbA
1c greater or equal than 8.5%, the reduction from baseline in HbA
1c empagliflozin 10 mg/linagliptin 5 mg (n=31) was -0.97% at 24 weeks (p=0.0875 versus placebo/empagliflozin 10 mg).
Linagliptin 5 mg in patients inadequately controlled on empagliflozin 25 mg and metformin: In patients inadequately controlled on empagliflozin 25 mg and metformin (mean daily dose 2003.9 (± 438.8) mg at baseline), 24-weeks treatment with empagliflozin 25 mg/linagliptin 5 mg provided statistically significant improvements in HbA
1c and FPG compared to placebo/empagliflozin 25 mg. Compared to placebo/empagliflozin 25 mg, empagliflozin 25 mg/linagliptin 5 mg provided similar results on body weight. A statistically significantly greater proportion of patients with a baseline HbA
1c ≥7.0% and treated with the empagliflozin 25 mg/linagliptin 5 mg achieved a target HbA
1c of <7% compared to placebo/empagliflozin 25 mg (Table 4). After 24 weeks' treatment with empagliflozin 25 mg/linagliptin 5 mg, both systolic and diastolic blood pressures were similar to placebo/empagliflozin 25 mg (n.s. for SBP and DBP).
After 24 weeks, rescue therapy was used in 0 (0.0%) patients treated with empagliflozin 25 mg/linagliptin 5 mg and in 3 (2.7%) patients treated with placebo/empagliflozin 25 mg.
In a pre-specified subgroup of patients (n=42) with baseline HbA
1c greater or equal than 8.5%, the reduction from baseline in HbA
1c with empagliflozin 25 mg/linagliptin 5 mg (n=20) was -1.16% at 24 weeks (p=0.0046 versus placebo+empagliflozin 25 mg). (See Table 4.)
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Cardiovascular safety: In the EMPA-REG OUTCOME trial, empagliflozin significantly reduced the risk of the combined endpoint of cardiovascular (CV) death, non-fatal myocardial infarction or non-fatal stroke (MACE-3) by 14% compared to placebo when added to standard of care in adults with T2DM and established CV disease, see JARDIANCE PI for details. This result was driven by a significant reduction in CV death, with no significant change in non-fatal myocardial infarction, or non-fatal stroke.
In prospective, pre-specified meta-analyses of independently adjudicated CV events in patients with T2DM from 19 clinical study studies of linagliptin involving 9459 patients, linagliptin did not increase CV risk.
There have been no clinical studies establishing conclusive evidence of GLYXAMBI's effect on cardiovascular morbidity and mortality.
Pharmacokinetics: The rate and extent of absorption of empagliflozin and linagliptin in GLYXAMBI (empagliflozin/linagliptin) are equivalent to the bioavailability of empagliflozin and linagliptin when administered as individual tablets.
The pharmacokinetics of empagliflozin and linagliptin have been extensively characterised in healthy volunteers and patients with T2DM. No clinically relevant differences in pharmacokinetics were seen between healthy volunteers and T2DM patients.
The following statements reflect the pharmacokinetic properties of the individual active substances of GLYXAMBI.
Absorption: Empagliflozin: The pharmacokinetics of empagliflozin have been extensively characterised in healthy volunteers and patients with T2DM. After oral administration, empagliflozin was rapidly absorbed with peak plasma concentrations (C
max) with a median C
max, (t
max) of 1.5 h post-dose. Thereafter, plasma concentrations declined in a biphasic manner with a rapid distribution phase and a relatively slow terminal phase.
The steady state mean plasma area under the curve (AUC) was 4740 nmol·h/L and C
max was 687 nmol/L with 25 mg empagliflozin once daily. Systemic exposure of empagliflozin increased in a dose-proportional manner. The single-dose and steady-state pharmacokinetics parameters of empagliflozin were similar suggesting linear pharmacokinetics with respect to time. There were no clinically relevant differences in empagliflozin pharmacokinetics between healthy volunteers and patients with T2DM. Administration of 25 mg empagliflozin after intake of a high-fat and high calorie meal resulted in slightly lower exposure; AUC decreased by approximately 16% and C
max decreased by approximately 37%, compared to fasted condition. The observed effect of food on empagliflozin pharmacokinetics was not considered clinically relevant and empagliflozin may be administered with or without food.
Linagliptin: The pharmacokinetics of linagliptin has been extensively characterised in healthy subjects and patients with type 2 diabetes. After oral administration of a 5 mg dose to healthy volunteer patients, linagliptin was rapidly absorbed, with peak plasma concentrations (median T
max) occurring 1.5 hours post-dose.
Plasma concentrations of linagliptin decline in a triphasic manner with a long terminal half-life (terminal half-life for linagliptin more than 100 hours), that is mostly related to the saturable, tight binding of linagliptin to DPP-4 and does not contribute to the accumulation of the drug.
The effective half-life for accumulation of linagliptin, as determined from oral administration of multiple doses of 5 mg linagliptin, is approximately 12 hours. After once-daily dosing, steady-state plasma concentrations of 5 mg linagliptin are reached by the third dose. Plasma area under the curve (AUC) of linagliptin increased approximately 33% following 5 mg doses at steady-state compared to the first dose. The intra-subject and inter-subject coefficients of variation for linagliptin AUC were small (12.6% and 28.5%, respectively). Plasma AUC of linagliptin increased in a less than dose-proportional manner. The pharmacokinetics of linagliptin was generally similar in healthy subjects and in patients with type 2 diabetes.
The absolute bioavailability of linagliptin is approximately 30%. Because co-administration of a high-fat meal with linagliptin had no clinically relevant effect on the pharmacokinetics, linagliptin may be administered with or without food.
In vitro studies indicated that linagliptin is a substrate of P-glycoprotein and of CYP3A4. Ritonavir, a potent inhibitor of P-glycoprotein and CYP3A4, led to a two-fold increase in exposure (AUC) and multiple co-administration of linagliptin with rifampicin, a potent inducer of P-glycoprotein and CYP3A, resulted in an approximate 40% decreased linagliptin steady-state AUC, presumably by increasing/decreasing the bioavailability of linagliptin by inhibition/induction of P-glycoprotein.
Distribution: Empagliflozin: The apparent steady-state volume of distribution was estimated to be 73.8 L, based on a population pharmacokinetic analysis. Following administration of an oral [14C]-empagliflozin solution to healthy subjects, the red blood cell partitioning was approximately 36.8% and plasma protein binding was 86.2%.
Linagliptin: As a result of tissue binding, the mean apparent volume of distribution at steady state following a single 5 mg intravenous dose of linagliptin to healthy subjects is approximately 1110 litres, indicating that linagliptin extensively distributes to the tissues. Plasma protein binding of linagliptin is concentration-dependent, decreasing from about 99% at 1 nmol/L to 75-89% at ≥30 nmol/L, reflecting saturation of binding to DPP-4 with increasing concentration of linagliptin. At the peak plasma concentration in humans at 5 mg/day, approximately 10% of linagliptin is unbound.
Metabolism: Empagliflozin: No major metabolites of empagliflozin were detected in human plasma and the most abundant metabolites were three glucuronide conjugates (2-O-, 3-O-, and 6-O-glucuronide). Systemic exposure of each metabolite was less than 10% of total drug-related material.
In vitro studies suggested that the primary route of metabolism of empagliflozin in humans is glucuronidation by the uridine 5'-diphospho-glucuronosyltransferases UGT2B7, UGT1A3, UGT1A8, and UGT1A9.
Linagliptin: Following a [14C]-linagliptin oral 10 mg dose, only 5% of the radioactivity was excreted in urine. Metabolism plays a subordinate role in the elimination of linagliptin. One main metabolite with a relative exposure of 13.3% of linagliptin at steady state was detected and was found to be pharmacologically inactive and thus does not contribute to the plasma DPP-4 inhibitory activity of linagliptin.
Excretion: Empagliflozin: The apparent terminal elimination half-life of empagliflozin was estimated to be 12.4 h and apparent oral clearance was 10.6 L/h based on the population pharmacokinetic analysis. The inter-subject and residual variabilities for empagliflozin oral clearance were 39.1% and 35.8%, respectively. With once-daily dosing, steady-state plasma concentrations of empagliflozin were reached by the fifth dose. Consistent with half-life, up to 22% accumulation, with respect to plasma AUC, was observed at steady-state. Following administration of an oral [14C]-empagliflozin solution to healthy subjects, approximately 95.6% of the drug related radioactivity was eliminated in faeces (41.2%) or urine (54.4%). The majority of drug related radioactivity recovered in faeces was unchanged parent drug and approximately half of drug related radioactivity excreted in urine was unchanged parent drug.
Linagliptin: Following administration of an oral [14C]-linagliptin dose to healthy subjects, approximately 85% of the administered radioactivity was eliminated in faeces (80%) or urine (5%) within 4 days of dosing. Renal clearance at steady state was approximately 70 mL/min.
Pharmacokinetics in special patient groups: Pharmacokinetics in children: Studies characterising the pharmacokinetics of empagliflozin or linagliptin in paediatric patients have not been performed.
Pharmacokinetics in the elderly: Age did not have a clinically meaningful impact on the pharmacokinetics of empagliflozin or linagliptin based on population pharmacokinetic analysis. Elderly subjects (65 to 78 years) had comparable plasma concentrations of linagliptin compared to younger subjects.
Renal Impairment: Based on pharmacokinetics, no dosage adjustment is recommended for GLYXAMBI in patients with renal impairment.
Empagliflozin: In patients with mild (eGFR: 60 - <90 mL/min/1.73 m
2), moderate (eGFR: 30 - <60 mL/min/1.73 m
2), severe (eGFR: <30 mL/min/1.73 m
2) renal impairment and patients with kidney failure/end stage renal disease (ESRD), AUC of empagliflozin increased by approximately 18%, 20%, 66%, and 48%, respectively, compared to subjects with normal renal function. Peak plasma levels of empagliflozin were similar in subjects with moderate renal impairment and kidney failure/ESRD compared to patients with normal renal function. Peak plasma levels of empagliflozin were roughly 20% higher in subjects with mild and severe renal impairment as compared to subjects with normal renal function. In line with the Phase I study, the population pharmacokinetic analysis showed that the apparent oral clearance of empagliflozin decreased with a decrease in eGFR leading to an increase in drug exposure. Based on pharmacokinetics, no dosage adjustment is recommended in patients with renal impairment.
Linagliptin: A multiple-dose, open-label study was conducted to evaluate the pharmacokinetics of linagliptin (5 mg dose) in patients with varying degrees of chronic renal impairment compared to normal healthy control subjects. The study included patients with renal impairment classified on the basis of creatinine clearance as mild (50 to <80 mL/min), moderate (30 to <50 mL/min), and severe (<30 mL/min), as well as patients with end stage renal disease (ESRD) on haemodialysis. In addition, patients with type 2 diabetes mellitus and severe renal impairment (<30 mL/min) were compared to patients with type 2 diabetes mellitus and normal renal function.
Creatinine clearance was measured by 24-hour urinary creatinine clearance measurements or estimated from serum creatinine based on the Cockcroft-Gault formula: CrCl = [140 - age (years)] x weight (kg) {x 0.85 for female patients} / [72 x serum creatinine (mg/dL)].
Under steady-state conditions, linagliptin exposure in patients with mild renal impairment was comparable to healthy subjects. In moderate renal impairment, a moderate increase in exposure of about 1.7-fold was observed compared with control. Exposure in patients with type 2 diabetes mellitus and severe renal impairment was increased by about 1.4-fold compared to patients with type 2 diabetes mellitus and normal renal function. Steady-state predictions for AUC of linagliptin in patients with ESRD indicated comparable exposure to that of patients with moderate or severe renal impairment. In addition, linagliptin is not expected to be eliminated to a therapeutically significant degree by haemodialysis or peritoneal dialysis. Therefore, no dosage adjustment of linagliptin is necessary in patients with any degree of renal impairment. In addition, mild renal impairment had no effect on linagliptin pharmacokinetics in patients with type 2 diabetes mellitus as assessed by population pharmacokinetic analyses.
Pharmacokinetics in patients with hepatic impairment: Based on pharmacokinetics of the two individual components, no dosage adjustment of GLYXAMBI is recommended in patients with hepatic impairment.
Empagliflozin: In subjects with mild, moderate, and severe hepatic impairment according to the Child-Pugh classification, AUC of empagliflozin increased approximately by 23%, 47%, and 75% and C
max by approximately 4%, 23%, and 48%, respectively, compared to subjects with normal hepatic function.
Linagliptin: In patients with mild, moderate and severe hepatic insufficiency (according to the Child-Pugh classification), mean AUC and C
max of linagliptin were similar to healthy matched controls following administration of multiple 5 mg doses of linagliptin.
Body Mass Index (BMI): No dosage adjustment is necessary for GLYXAMBI based on BMI. Body mass index had no clinically relevant effect on the pharmacokinetics of empagliflozin or linagliptin based on population pharmacokinetic analysis.
Gender: No dosage adjustment is necessary based on gender. Gender had no clinically relevant effect on the pharmacokinetics of empagliflozin or linagliptin based on population pharmacokinetic analysis.
Race: No dosage adjustment is necessary based on race.
Empagliflozin: Based on the population pharmacokinetic analysis, AUC was estimated to be 13.5% higher in Asian patients with a BMI of 25 kg/m
2 compared to non-Asian patients with a BMI of 25 kg/m
2.
Linagliptin: Race had no obvious effect on the plasma concentrations of linagliptin based on a composite analysis of available pharmacokinetic data, including patients of Caucasian, Hispanic, African- American, and Asian origin. In addition the pharmacokinetic characteristics of linagliptin were found to be similar in dedicated phase I studies in Japanese, Chinese and Caucasian healthy volunteers and African American type 2 diabetes patients.
Toxicology: Preclinical safety data: Genotoxicity: No genotoxicity studies with the combination of empagliflozin and linagliptin have been performed.
Empagliflozin: Empagliflozin was not mutagenic or clastogenic in a battery of genotoxicity studies, including the Ames bacterial mutagenicity assay (bacterial reverse mutation),
in vitro mouse lymphoma tk assays and
in vivo rat bone marrow micronucleus assays.
Linagliptin: Linagliptin was not mutagenic or clastogenic with or without metabolic activation in the Ames bacterial mutagenicity assay, a chromosomal aberration test in human lymphocytes, and an
in vivo micronucleus assay in the rat.
Carcinogenicity: No carcinogenicity studies with the combination of empagliflozin and linagliptin have been performed.
Empagliflozin: Two-year oral carcinogenicity studies were conducted in mice and rats. There was an increase in renal adenomas and carcinomas in male mice given empagliflozin at 1000 mg/kg/day. No renal tumours were seen at 300 mg/kg/day (11- and 28-times the exposure at the clinical dose of 25 mg and 10 mg, respectively). These tumours are likely associated with a metabolic pathway not present in humans, and are considered to be irrelevant to patients given 10 or 25 mg empagliflozin. No drug-related tumours were seen in female mice or female rates at doses up to 1000 and 700 mg/kg/day, respectively, resulting in exposures at least 60 times that expected at the clinical dose of 10 or 25 mg empagliflozin. In male rats, treatment-related benign vascular proliferative lesions (haemangiomas) of the mesenteric lymph node, were observed at 700 mg/kg/day, but not at 300 mg/kg/day (approximately 26- and 65-times the exposure at the clinical does of 25 mg and 10 mg, respectively). These tumours are common in rats and are unlikely to be relevant to humans.
Linagliptin: No evidence of carcinogenicity was observed with linagliptin in 2-year studies in mice and rats given oral doses up to 80 mg/kg/day and 60 mg/kg/day, respectively.
These doses correspond to approximately 300- and 400-times the human exposure (plasma AUC) at the MRHD of 5 mg/day.