Dapagliflozin 5 mg Tablet, Film Coated, 90-count — NDC 73190-072-90 (Billing 73190-0072-90)

12 CLINICAL PHARMACOLOGY

12.1Mechanism of Action Sodium-glucose cotransporter 2 (SGLT2), expressed in the proximal renal tubules, is responsible for the majority of the reabsorption of filtered glucose from the tubular lumen. Dapagliflozin is an inhibitor of SGLT2. By inhibiting SGLT2, dapagliflozin reduces reabsorption of filtered glucose and thereby promotes urinary glucose excretion.

Dapagliflozin also reduces sodium reabsorption and increases the delivery of sodium to the distal tubule. This may influence several physiological functions including, but not restricted to, lowering both pre- and afterload of the heart and downregulation of sympathetic activity.

12.2Pharmacodynamics General Increases in the amount of glucose excreted in the urine were observed in healthy subjects and in patients with type 2 diabetes mellitus following the administration of dapagliflozin (see Figure 1). Dapagliflozin doses of 5 or 10 mg per day in patients with type 2 diabetes mellitus for 12 weeks resulted in excretion of approximately 70 grams of glucose in the urine per day at Week 12. A near maximum glucose excretion was observed at the dapagliflozin daily dosage of 20 mg.

This urinary glucose excretion with dapagliflozin also results in increases in urinary volume [ see Adverse Reactions (6.1)]. After discontinuation of dapagliflozin, on average, the elevation in urinary glucose excretion approaches baseline by about 3 days for the 10 mg dosage. Figure 1: Scatter Plot and Fitted Line of Change from Baseline in 24-Hour Urinary Glucose Amount versus Dapagliflozin Dose in Healthy Subjects and Subjects with Type 2 Diabetes Mellitus (T2DM) (Semi-Log Plot) Cardiac Electrophysiology Dapagliflozin was not associated with clinically meaningful prolongation of QTc interval at daily doses up to 150 mg (15-times the recommended maximum dose) in a study of healthy subjects.

In addition, no clinically meaningful effect on QTc interval was observed following single doses of up to 500 mg (50-times the recommended maximum dose) of dapagliflozin in healthy subjects. fig1

12.3Pharmacokinetics Absorption Following oral administration of dapagliflozin, the maximum plasma concentration (C max ) is usually attained within 2 hours under fasting state. The C max and AUC values increase dose proportionally with increase in dapagliflozin dose in the therapeutic dose range. The absolute oral bioavailability of dapagliflozin following the administration of a 10 mg dose is 78%.

Administration of dapagliflozin with a high-fat meal decreases its C max by up to 50% and prolongs T max by approximately 1 hour, but does not alter AUC as compared with the fasted state. These changes are not considered to be clinically meaningful and dapagliflozin can be administered with or without food. Distribution Dapagliflozin is approximately 91% protein bound.

Protein binding is not altered in patients with renal or hepatic impairment. Metabolism The metabolism of dapagliflozin is primarily mediated by UGT1A9; CYP-mediated metabolism is a minor clearance pathway in humans. Dapagliflozin is extensively metabolized, primarily to yield dapagliflozin 3-O-glucuronide, which is an inactive metabolite.

Dapagliflozin 3-O-glucuronide accounted for 61% of a 50 mg [ 14 C]-dapagliflozin dose and is the predominant drug-related component in human plasma. Elimination Dapagliflozin and related metabolites are primarily eliminated via the renal pathway. Following a single 50 mg dose of [ 14 C]-dapagliflozin, 75% and 21% total radioactivity is excreted in urine and feces, respectively.

In urine, less than 2% of the dose is excreted as parent drug. In feces, approximately 15% of the dose is excreted as parent drug. The mean plasma terminal half-life (t ½ ) for dapagliflozin is approximately 12.9 hours following a single oral dose of dapagliflozin 10 mg.

Specific Populations Effects of Age, Gender, Race, and Body Weight on Pharmacokinetics Based on a population pharmacokinetic analysis, age, gender, ra… [Excerpted — this section continues on DailyMed.]

12.1Mechanism of Action Sodium-glucose cotransporter 2 (SGLT2), expressed in the proximal renal tubules, is responsible for the majority of the reabsorption of filtered glucose from the tubular lumen. Dapagliflozin is an inhibitor of SGLT2. By inhibiting SGLT2, dapagliflozin reduces reabsorption of filtered glucose and thereby promotes urinary glucose excretion.

Dapagliflozin also reduces sodium reabsorption and increases the delivery of sodium to the distal tubule. This may influence several physiological functions including, but not restricted to, lowering both pre- and afterload of the heart and downregulation of sympathetic activity.

12.3Pharmacokinetics Absorption Following oral administration of dapagliflozin, the maximum plasma concentration (C max ) is usually attained within 2 hours under fasting state. The C max and AUC values increase dose proportionally with increase in dapagliflozin dose in the therapeutic dose range. The absolute oral bioavailability of dapagliflozin following the administration of a 10 mg dose is 78%.

Administration of dapagliflozin with a high-fat meal decreases its C max by up to 50% and prolongs T max by approximately 1 hour, but does not alter AUC as compared with the fasted state. These changes are not considered to be clinically meaningful and dapagliflozin can be administered with or without food. Distribution Dapagliflozin is approximately 91% protein bound.

Protein binding is not altered in patients with renal or hepatic impairment. Metabolism The metabolism of dapagliflozin is primarily mediated by UGT1A9; CYP-mediated metabolism is a minor clearance pathway in humans. Dapagliflozin is extensively metabolized, primarily to yield dapagliflozin 3-O-glucuronide, which is an inactive metabolite.

Dapagliflozin 3-O-glucuronide accounted for 61% of a 50 mg [ 14 C]-dapagliflozin dose and is the predominant drug-related component in human plasma. Elimination Dapagliflozin and related metabolites are primarily eliminated via the renal pathway. Following a single 50 mg dose of [ 14 C]-dapagliflozin, 75% and 21% total radioactivity is excreted in urine and feces, respectively.

In urine, less than 2% of the dose is excreted as parent drug. In feces, approximately 15% of the dose is excreted as parent drug. The mean plasma terminal half-life (t ½ ) for dapagliflozin is approximately 12.9 hours following a single oral dose of dapagliflozin 10 mg.

Specific Populations Effects of Age, Gender, Race, and Body Weight on Pharmacokinetics Based on a population pharmacokinetic analysis, age, gender, race, and body weight do not have a clinically meaningful effect on the pharmacokinetics of dapagliflozin and thus, no dose adjustment is recommended. Patients with Renal Impairment At steady-state (20 mg once daily dapagliflozin for 7 days), adult patients with type 2 diabetes with mild, moderate, or severe renal impairment (as determined by eGFR) had geometric mean systemic exposures of dapagliflozin that were 45%, 100%, and 200% higher, respectively, as compared to patients with type 2 diabetes mellitus with normal renal function.

Higher systemic exposure of dapagliflozin in patients with type 2 diabetes mellitus with renal impairment did not result in a correspondingly higher 24-hour urinary glucose excretion. The steady-state 24-hour urinary glucose excretion in patients with type 2 diabetes mellitus and mild, moderate, and severe renal impairment was 42%, 80%, and 90% lower, respectively, than in patients with type 2 diabetes mellitus with normal renal function. The impact of hemodialysis on dapagliflozin exposure is not known [see Warnings and Precautions ( 5.2 ), Use in Specific Populations ( 8.6 ), and Clinical Studies (14 )].

Patients with Hepatic Impairment In adult subjects with mild and moderate hepatic impairment (Child-Pugh classes A and B), mean C max and AUC of dapagliflozin were up to 12% and 36% higher, respectively, as compared to healthy matched control subjects following single-dose administration of 10 mg dapagliflozin. These differences were not considered to be clinically meaningful. In adult patients with severe hepatic impairment (Child-Pugh class C), mean C max and AUC of dapagliflozin were up to 40% and 67% higher, respectively, as compared to healthy matched controls [see Use in Specific Populations (8.7)].

Drug Interactions In Vitro Assessment of Drug Interactions In in vitro studies, dapagliflozin and dapagliflozin 3-O-glucuronide neither inhibited CYP 1A2, 2C9, 2C19, 2D6, or 3A4, nor induced CYP 1A2, 2B6, or 3A4. Dapagliflozin is a weak substrate of the P-glycoprotein (P-gp) active transporter, and dapagliflozin… [Excerpted — this section continues on DailyMed.]

12.2Pharmacodynamics General Increases in the amount of glucose excreted in the urine were observed in healthy subjects and in patients with type 2 diabetes mellitus following the administration of dapagliflozin (see Figure 1). Dapagliflozin doses of 5 or 10 mg per day in patients with type 2 diabetes mellitus for 12 weeks resulted in excretion of approximately 70 grams of glucose in the urine per day at Week 12. A near maximum glucose excretion was observed at the dapagliflozin daily dosage of 20 mg.

This urinary glucose excretion with dapagliflozin also results in increases in urinary volume [ see Adverse Reactions (6.1)]. After discontinuation of dapagliflozin, on average, the elevation in urinary glucose excretion approaches baseline by about 3 days for the 10 mg dosage. Figure 1: Scatter Plot and Fitted Line of Change from Baseline in 24-Hour Urinary Glucose Amount versus Dapagliflozin Dose in Healthy Subjects and Subjects with Type 2 Diabetes Mellitus (T2DM) (Semi-Log Plot) Cardiac Electrophysiology Dapagliflozin was not associated with clinically meaningful prolongation of QTc interval at daily doses up to 150 mg (15-times the recommended maximum dose) in a study of healthy subjects.

In addition, no clinically meaningful effect on QTc interval was observed following single doses of up to 500 mg (50-times the recommended maximum dose) of dapagliflozin in healthy subjects. fig1

14 CLINICAL STUDIES

14.1Glycemic Control in Adults with Type 2 Diabetes Mellitus Overview of Clinical Trials of Dapagliflozin in Adults with Type 2 Diabetes Mellitus Dapagliflozin has been studied in adult patients as monotherapy, in combination with metformin, pioglitazone, sulfonylurea (glimepiride), sitagliptin (with or without metformin), metformin plus a sulfonylurea, or insulin (with or without other oral antidiabetic therapy), compared to a sulfonylurea (glipizide), and in combination with a GLP-1 receptor agonist (exenatide extended-release) added-on to metformin.

Dapagliflozin has also been studied in adult patients with type 2 diabetes mellitus and moderate renal impairment. Treatment with dapagliflozin as monotherapy and in combination with metformin, glimepiride, pioglitazone, sitagliptin, or insulin produced statistically significant improvements in mean change from baseline at Week 24 in HbA1c compared to control. Reductions in HbA1c were seen across subgroups including gender, age, race, duration of disease, and baseline body mass index (BMI).

Monotherapy A total of 840 treatment-naive adult patients with inadequately controlled type 2 diabetes mellitus participated in 2 placebo-controlled trials to evaluate the safety and efficacy of monotherapy with dapagliflozin. In one monotherapy trial, a total of 558 treatment-naive patients with inadequately controlled diabetes participated in a 24-week trial (NCT00528372). Following a 2-week diet and exercise placebo lead-in period, 485 patients with HbA1c ≥7% and ≤10% were randomized to dapagliflozin 5 mg or dapagliflozin 10 mg once daily in either the morning (QAM, main cohort) or evening (QPM), or placebo.

At Week 24, treatment with dapagliflozin 10 mg QAM provided significant improvements in HbA1c and the fasting plasma glucose (FPG) compared with placebo (see Table 7). Table 7: Results at Week 24 (LOCF*) in a Placebo-Controlled Trial of Dapagliflozin Monotherapy in Adults with Type 2 Diabetes Mellitus (Main Cohort AM Doses) Efficacy Parameter Dapagliflozin 10 mg N=70 † Dapagliflozin 5 mg N=64 † Placebo N=75 † HbA1c (%) Baseline (mean) 8.0 7.8

7.8Change from baseline (adjusted mean ‡ ) −0.9 −0.8 −0.2 Difference from placebo (adjusted mean ‡ ) (95% CI) −0.7§ (−1.0, −0.4) −0.5 (−0.8, −0.2) Percent of patients achieving HbA1c <7% adjusted for baseline 50.8% ¶ 44.2% ¶ 31.6% FPG (mg/dL) Baseline (mean) 166.6 157.2 159.9 Change from baseline (adjusted mean ‡ ) −28.8 −24.1 −4.1 Difference from placebo (adjusted mean ‡ ) (95% CI) −24.7 § (−35.7, −13.6) −19.9 (−31.3, −8.5) * LOCF: last observation (prior to rescue for rescued patients) carried forward. † All randomized patients who took at least one dose of double-blind trial medication during the short-term double-blind period. ‡ Least squares mean adjusted for baseline value. § p-value <0.0001 versus placebo.

Sensitivity analyses yielded smaller estimates of treatment difference with placebo. ¶ Not evaluated for statistical significance as a result of the sequential testing procedure for the secondary endpoints. Initial Combination Therapy with Metformin XR A total of 1,236 treatment-naive adult patients with inadequately controlled type 2 diabetes mellitus (HbA1c ≥7.5% and ≤12%) participated in 2 active-controlled trials of 24-week duration to evaluate initial therapy with dapagliflozin 5 mg or 10 mg in combination with metformin extended-release (XR) formulation.

In one trial (NCT00859898), 638 patients randomized to 1 of 3 treatment arms following a 1-week lead-in period received: Dapagliflozin 10 mg plus metformin XR (up to 2,000 mg per day), dapagliflozin 10 mg plus placebo, or metformin XR (up to 2,000 mg per day) plus placebo. Metformin XR dose was up-titrated weekly in 500 mg increments, as tolerated, with a median dose achieved of 2,000 mg. The combination treatment of dapagliflozin 10 mg plus metformin XR provided statistically significant improvements in HbA1c and FPG compared with either of the monotherapy tre… [Excerpted — this section continues on DailyMed.]

13 NONCLINICAL TOXICOLOGY

13.1Carcinogenesis, Mutagenesis, Impairment of Fertility Dapagliflozin did not induce tumors in either mice or rats at any of the doses evaluated in 2-year carcinogenicity studies. Oral doses in mice consisted of 5, 15, and 40 mg/kg/day in males and 2, 10, and 20 mg/kg/day in females, and oral doses in rats were 0.5, 2, and 10 mg/kg/day for both males and females. The highest doses evaluated in mice were approximately 72-times (males) and 105-times (females) the clinical dose of 10 mg per day, based on AUC exposure.

In rats, the highest dose was approximately 131-times (males) and 186-times (females) the clinical dose of 10 mg per day, based on AUC exposure. Dapagliflozin was negative in the Ames mutagenicity assay and was positive in a series of in vitro clastogenicity assays in the presence of S9 activation and at concentrations greater than or equal to 100 μg/mL. Dapagliflozin was negative for clastogenicity in a series of in vivo studies evaluating micronuclei or DNA repair in rats at exposure multiples greater than 2100-times the clinical dose.

There was no carcinogenicity or mutagenicity signal in animal studies, suggesting that dapagliflozin does not represent a genotoxic risk to humans. Dapagliflozin had no effects on mating, fertility, or early embryonic development in treated male or female rats at exposure multiples less than or equal to 1708-times and 998-times the maximum recommended human dose in males and females, respectively.