Dapagliflozin and Metformin Hydrochloride

XIGDUO XR is a combination of dapagliflozin and metformin hydrochloride (HCl) extended-release, indicated as an adjunct to diet and exercise to improve glycemic control in adults and pediatric patients aged 10 years and older with type 2 diabetes mellitus. Dapagliflozin, when used as a component of XIGDUO XR, is indicated in adults with type 2 diabetes mellitus to reduce the risk of:

• Sustained eGFR decline, end‑stage kidney disease, (CV) death, and hospitalization for heart failure in patients with chronic kidney disease at risk of progression.
• CV death, hospitalization for heart failure, and urgent heart failure visit in patients with heart failure.
• Hospitalization for heart failure in patients with type 2 diabetes mellitus and either established CV disease or multiple CV risk factors. Limitations of Use
• XIGDUO XR is not recommended for use to improve glycemic control in patients with type 1 diabetes mellitus [see Warnings and Precautions (5.2) ] .
• Because of the metformin HCl component, the use of XIGDUO XR is limited to patients with type 2 diabetes mellitus for all indications.
• XIGDUO XR is not recommended for the treatment of chronic kidney disease in patients with polycystic kidney disease or patients requiring or with a recent history of immunosuppressive therapy for kidney disease. XIGDUO XR is not expected to be effective in these populations. XIGDUO XR is a combination of dapagliflozin, a sodium-glucose cotransporter 2 (SGLT2) inhibitor, and metformin hydrochloride (HCl), a biguanide, indicated as an adjunct to diet and exercise to improve glycemic control in adults and pediatric patients aged 10 years and older with type 2 diabetes mellitus. ( 1 ) Dapagliflozin when used as a component of XIGDUO XR, is indicated in adults with type 2 diabetes mellitus to reduce the risk of:
• Sustained eGFR decline, end-stage kidney disease, cardiovascular (CV) death, and hospitalization for heart failure in patients with chronic kidney disease at risk of progression. ( 1 )
• CV death, hospitalization for heart failure, and urgent heart failure visit in patients with heart failure. ( 1 )
• Hospitalization for heart failure in patients with type 2 diabetes mellitus and either established CV disease or multiple CV risk factors. ( 1 ) Limitations of use :
• Not recommended for use to improve glycemic control in patients with type 1 diabetes mellitus. ( 1 )
• Because of the metformin HCl component, the use of XIGDUO XR is limited to patients with type 2 diabetes mellitus for all indications. ( 1 )
• Not recommended for the treatment of chronic kidney disease in patients with polycystic kidney disease or patients requiring or with a recent history of immunosuppressive therapy for the treatment of kidney disease. XIGDUO XR is not expected to be effective in these populations. ( 1 )

XIGDUO XR (dapagliflozin and metformin HCl) extended-release tablets are available as follows: Table 1: Dosage Forms and Strengths for XIGDUO XR Dapagliflozin Strength Metformin HCl Strength Color/Shape Tablet Markings 2.5 mg 1,000 mg light brown to brown, biconvex, oval-shaped, and film-coated tablet "1074" and "2.5/1000" debossed on one side and plain on the reverse side 5 mg 500 mg orange, biconvex, capsule-shaped, and film-coated tablet "1070" and "5/500" debossed on one side and plain on the reverse side 5 mg 1,000 mg pink to dark pink, biconvex, oval-shaped, and film-coated tablet "1071" and "5/1000" debossed on one side and plain on the reverse side 10 mg 500 mg pink, biconvex, capsule-shaped, and film-coated tablet "1072" and "10/500" debossed on one side and plain on the reverse side 10 mg 1,000 mg yellow to dark yellow, biconvex, oval-shaped, and film-coated tablet "1073" and "10/1000" debossed on one side and plain on the reverse side

• 2.5 mg dapagliflozin/1,000 mg metformin HCl extended-release ( 3 )
• 5 mg dapagliflozin/500 mg metformin HCl extended-release ( 3 )
• 5 mg dapagliflozin/1,000 mg metformin HCl extended-release ( 3 )
• 10 mg dapagliflozin/500 mg metformin HCl extended-release ( 3 )
• 10 mg dapagliflozin/1,000 mg metformin HCl extended-release ( 3 )

XIGDUO XR is contraindicated in patients with:

• Severe renal impairment (eGFR below 30 mL/min/1.73 m 2 ) or end-stage renal disease [see Warnings and Precautions (5.1) ] .
• History of a serious hypersensitivity reaction to dapagliflozin, metformin HCl, or any of the excipients in XIGDUO XR. Serious hypersensitivity reactions, including anaphylaxis and angioedema have been reported with dapagliflozin [see Adverse Reactions (6.1) ] .
• Acute or chronic metabolic acidosis, including diabetic ketoacidosis, with or without coma. Diabetic ketoacidosis should be treated with insulin [see Warnings and Precautions (5.1) and Warnings and Precautions (5.2) ] .
• Severe renal impairment (eGFR below 30 mL/min/1.73 m 2 ) or end-stage renal disease. ( 4 )
• History of serious hypersensitivity to dapagliflozin, metformin HCl, or any of the excipients in XIGDUO XR. ( 4 )
• Metabolic acidosis, including diabetic ketoacidosis. ( 4 )

• Lactic Acidosis: See boxed warning. ( 5.1 )
• Diabetic Ketoacidosis in Patients with Type 1 Diabetes Mellitus and Other Ketoacidosis: Consider ketone monitoring in patients at risk for ketoacidosis, as indicated. Assess for ketoacidosis regardless of presenting blood glucose levels and discontinue XIGDUO XR if ketoacidosis is suspected. Monitor patients for resolution of ketoacidosis before restarting. ( 5.2 )
• Volume Depletion: Before initiating XIGDUO XR, assess and correct volume status in the elderly, patients with renal impairment or low systolic blood pressure, and in patients on diuretics. Monitor for signs and symptoms during therapy. ( 5.3 )
• Genitourinary Infections, including Urosepsis, Pyelonephritis, Necrotizing Fasciitis of the Perineum (Fournier's Gangrene), and Genital Mycotic Infections: Monitor patients for signs and symptoms of genitourinary infections and treat promptly, if indicated. Immediately evaluate patients presenting with pain or tenderness, erythema, or swelling in the genital or perineal area, along with fever or malaise, for necrotizing fasciitis and if suspected, discontinue XIGDUO XR, and promptly institute appropriate medical and/or surgical intervention. ( 5.4 )
• Hypoglycemia with Concomitant Use with Insulin or Insulin Secretagogues: Consider a lower dosage of insulin or an insulin secretagogue to reduce the risk of hypoglycemia when used concomitantly with XIGDUO XR. ( 5.5 )
• Vitamin B12 Deficiency: Metformin may lower vitamin B12 levels. Measure hematological parameters annually. ( 5.6 )

5.1 Lactic Acidosis There have been post-marketing cases of metformin-associated lactic acidosis, including fatal cases. These cases had a subtle onset and were accompanied by non‑specific symptoms such as malaise, myalgias, abdominal pain, respiratory distress, or increased somnolence; however, hypothermia, hypotension and resistant bradyarrhythmias have occurred with severe acidosis. Metformin-associated lactic acidosis was characterized by elevated blood lactate concentrations (>5 mmol/L), anion gap acidosis (without evidence of ketonuria or ketonemia), and an increased lactate: pyruvate ratio; metformin plasma levels generally >5 mcg/mL. Metformin decreases liver uptake of lactate increasing lactate blood levels which may increase the risk of lactic acidosis, especially in patients at risk. If metformin-associated lactic acidosis is suspected, general supportive measures should be instituted promptly in a hospital setting, along with immediate discontinuation of XIGDUO XR. In XIGDUO XR-treated patients with a diagnosis or strong suspicion of lactic acidosis, prompt hemodialysis is recommended to correct the acidosis and remove accumulated metformin (metformin HCl is dialyzable, with a clearance of up to 170 mL/min under good hemodynamic conditions). Hemodialysis has often resulted in reversal of symptoms and recovery. Educate patients and their families about the symptoms of lactic acidosis and if these symptoms occur, instruct them to discontinue XIGDUO XR and report these symptoms to their healthcare provider. For each of the known and possible risk factors for metformin-associated lactic acidosis, recommendations to reduce the risk of and manage metformin-associated lactic acidosis are provided below: Renal Impairment : The postmarketing metformin-associated lactic acidosis cases primarily occurred in patients with significant renal impairment. The risk of metformin accumulation and metformin-associated lactic acidosis increases with the severity of renal impairment because metformin is substantially excreted by the kidney. Clinical recommendations based upon the patient’s renal function include [see Dosage and Administration (2.1 , 2.4) and Clinical Pharmacology (12.3) ] :

• Before initiating XIGDUO XR, obtain an estimated glomerular filtration rate (eGFR).
• XIGDUO XR is contraindicated in patients with an eGFR less than 30 mL/min/1.73 m 2 [see Contraindications (4) ] .
• Obtain an eGFR at least annually in all patients taking XIGDUO XR. In patients at increased risk for the development of renal impairment (e.g., the elderly), renal function should be assessed more frequently. Drug Interactions: The concomitant use of XIGDUO XR with specific drugs may increase the risk of metformin-associated lactic acidosis: those that impair renal function, result in significant hemodynamic change, interfere with acid-base balance or increase metformin accumulation (e.g., cationic drugs) [see Drug Interactions (7) ] . Therefore, consider more frequent monitoring of patients. Age 65 or Greater: The risk of metformin-associated lactic acidosis increases with the patient’s age because elderly patients have a greater likelihood of having hepatic, renal, or cardiac impairment than younger patients. Assess renal function more frequently in elderly patients [see Use in Specific Populations (8.5) ] . Radiological Studies with Contrast: Administration of intravascular iodinated contrast agents in metformin-treated patients has led to an acute decrease in renal function and the occurrence of lactic acidosis. Stop XIGDUO XR at the time of, or prior to, an iodinated contrast imaging procedure in patients with a history of hepatic impairment, alcoholism, or heart failure; or in patients who will be administered intra-arterial iodinated contrast. Re-evaluate eGFR 48 hours after the imaging procedure, and restart XIGDUO XR if renal function is stable. Surgery and Other Procedures: Withholding of food and fluids during surgical or other procedures may increase the risk for volume depletion, hypotension and renal impairment. XIGDUO XR should be temporarily discontinued while patients have restricted food and fluid intake. Hypoxic States: Several of the postmarketing cases of metformin-associated lactic acidosis occurred in the setting of acute congestive heart failure (particularly when accompanied by hypoperfusion and hypoxemia). CV collapse (shock), acute myocardial infarction, sepsis, and other conditions associated with hypoxemia have been associated with lactic acidosis and may also cause prerenal azotemia. When such events occur, discontinue XIGDUO XR. Excessive Alcohol Intake: Alcohol potentiates the effect of metformin on lactate metabolism and this may increase the risk of metformin-associated lactic acidosis. Warn patients against excessive alcohol intake while receiving XIGDUO XR. Hepatic Impairment: Patients with hepatic impairment have developed cases of metformin-associated lactic acidosis. This may be due to impaired lactate clearance resulting in higher lactate blood levels. Therefore, avoid use of XIGDUO XR in patients with clinical or laboratory evidence of hepatic disease. Mitochondrial Diseases: Metformin may increase the risk of lactic acidosis in patients with mitochondrial diseases such as mitochondrial encephalomyopathy with lactic acidosis, and stroke-like episodes (MELAS) syndrome and maternally inherited diabetes and deafness (MIDD). XIGDUO XR is not recommended in patients with mitochondrial diseases such as MELAS syndrome and MIDD. If a patient taking XIGDUO XR develops elevated lactic acid levels (with or without accompanying neurologic signs and symptoms), discontinue XIGDUO XR. Depending on the clinical context, consider evaluating the patient for MELAS, MIDD, or other mitochondrial disease.

5.2 Diabetic Ketoacidosis in Patients with Type 1 Diabetes Mellitus and Other Ketoacidosis In patients with type 1 diabetes mellitus, dapagliflozin, a component of XIGDUO XR, significantly increases the risk of diabetic ketoacidosis, a life-threatening event, beyond the background rate. In placebo-controlled trials of patients with type 1 diabetes mellitus, the risk of ketoacidosis was markedly increased in patients who received sodium-glucose cotransporter 2 (SGLT2) inhibitors compared to patients who received placebo. XIGDUO XR is not indicated for glycemic control in patients with type 1 diabetes mellitus. […]

The following important adverse reactions are described below and elsewhere in the labeling:

• Lactic Acidosis [see Boxed Warning and Warnings and Precautions (5.1) ]
• Diabetic Ketoacidosis in Patients with Type 1 Diabetes Mellitus and Other Ketoacidosis [see Warnings and Precautions (5.2) ]
• Volume Depletion [see Warnings and Precautions (5.3) ]
• Genitourinary Infections, including Urosepsis, Pyelonephritis, Necrotizing Fasciitis of the Perineum (Fournier’s Gangrene), and Genital Mycotic Infections [see Warnings and Precautions (5.4 )]
• Hypoglycemia with Concomitant Use with Insulin or Insulin Secretagogues [see Warnings and Precautions (5.5) ]
• Vitamin B 12 Deficiency [see Warnings and Precautions (5.6) ]
• Adverse reactions reported in >5% of patients treated with XIGDUO XR were female genital mycotic infection, nasopharyngitis, urinary tract infection, diarrhea, and headache. ( 6.1 )
• Adverse reactions reported in >5% of patients treated with metformin extended-release are: diarrhea and nausea/vomiting. ( 6.1 ) To report SUSPECTED ADVERSE REACTIONS, contact AstraZeneca at 1-800-236-9933 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.

6.1 Clinical Trials Experience Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in clinical practice. Clinical Trials with Metformin HCl Extended-Release in Adults with Type 2 Diabetes Mellitus In placebo-controlled monotherapy trials of metformin HCl extended-release, diarrhea and nausea/vomiting were reported in >5% of metformin-treated patients and more commonly than in placebo-treated patients (9.6% versus 2.6% for diarrhea and 6.5% versus 1.5% for nausea/vomiting). Diarrhea led to discontinuation of study medication in 0.6% of the patients treated with metformin HCl extended-release. Clinical Trials with Dapagliflozin in Adults Dapagliflozin Dapagliflozin has been evaluated in clinical trials in adult and pediatric patients 10 years of age and older with type 2 diabetes mellitus, in adult patients with heart failure, and in adult patients with chronic kidney disease. The overall safety profile of dapagliflozin was consistent across the studied indications. No new adverse reactions were identified in the DAPA-HF, DELIVER and DAPA-CKD trials. Pools of Placebo-Controlled Clinical Trials for Glycemic Control in Adults Pool of 8 Placebo-Controlled Adult Trials for Dapagliflozin and Metformin HCl for Glycemic Control Data from a prespecified pool of adult patients from 8 short-term, placebo-controlled trials of dapagliflozin coadministered with metformin HCl immediate- or extended-release was used to evaluate safety. This pool included several add-on trials (metformin HCl alone and in combination with a dipeptidyl peptidase-4 [DPP4] inhibitor and metformin HCl, or insulin and metformin HCl, 2 initial combination with metformin HCl trials, and 2 trials of patients with CVD and type 2 diabetes mellitus who received their usual treatment [with metformin HCl as background therapy]). For trials that included background therapy with and without metformin HCl, only patients who received metformin HCl were included in the 8-trial placebo-controlled pool. Across these 8 trials, 983 patients were treated once daily with dapagliflozin 10 mg and metformin HCl, and 1185 were treated with placebo and metformin HCl. These 8 trials provide a mean duration of exposure of 23 weeks. The mean age of the population was 57 years and 2% were older than 75 years. Fifty-four percent (54%) of the population was male; 88% White, 6% Asian, and 3% Black or African American. At baseline, the population had diabetes for an average of 8 years, mean hemoglobin A1c (HbA1c) was 8.4%, and renal function was normal or mildly impaired in 90% of patients and moderately impaired in 10% of patients. The overall incidence of adverse events for the 8-trial, short-term, placebo-controlled pool in adult patients treated with dapagliflozin 10 mg and metformin HCl was 60.3% compared to 58.2% for the placebo and metformin HCl group. Discontinuation of therapy due to adverse events in patients who received dapagliflozin 10 mg and metformin HCl was 4% compared to 3.3% for the placebo and metformin HCl group. The most commonly reported events leading to discontinuation and reported in at least 3 patients treated with dapagliflozin 10 mg and metformin HCl were renal impairment (0.7%), increased blood creatinine (0.2%), decreased renal creatinine clearance (0.2%), and urinary tract infection (0.2%). Table 2 shows common adverse reactions in adults associated with the use of dapagliflozin and metformin HCl. These adverse reactions were not present at baseline, occurred more commonly on dapagliflozin and metformin HCl than on placebo, and occurred in at least 2% of patients treated with either dapagliflozin 5 mg or dapagliflozin 10 mg. Table 2: Adverse Reactions in Placebo-Controlled Trials Reported in ≥2% of Adult Patients Treated with Dapagliflozin and Metformin HCl Adverse Reaction % of Patients Pool of 8 Placebo-Controlled Trials Placebo and Metformin HCl N=1185 Dapagliflozin 5 mg and Metformin HCl N=410 Dapagliflozin 10 mg and Metformin HCl N=983 Female genital mycotic infections Genital mycotic infections include the following adverse reactions, listed in order of frequency reported for females: vulvovaginal mycotic infection, vaginal infection, genital infection, vulvovaginitis, fungal genital infection, vulvovaginal candidiasis, vulval abscess, genital candidiasis, and vaginitis bacterial. (N for females: Placebo and metformin HCl=534, dapagliflozin 5 mg and metformin HCl=223, dapagliflozin 10 mg and metformin HCl=430). 1.5 9.4

9.3 Nasopharyngitis 5.9 6.3

5.2 Urinary tract infections Urinary tract infections include the following adverse reactions, listed in order of frequency reported: urinary tract infection, cystitis, pyelonephritis, urethritis, and prostatitis. 3.6 6.1

5.5 Diarrhea 5.6 5.9

4.2 Headache 2.8 5.4

3.3 Male genital mycotic infections Genital mycotic infections include the following adverse reactions, listed in order of frequency reported for males: balanitis, fungal genital infection, balanitis candida, genital candidiasis, genital infection, posthitis, and balanoposthitis. (N for males: Placebo and metformin HCl=651, dapagliflozin 5 mg and metformin HCl=187, dapagliflozin 10 mg and metformin HCl=553). 0 4.3

3.6 Influenza 2.4 4.1

2.6 Nausea 2.0 3.9

2.6 Back pain 3.2 3.4

2.5 Dizziness 2.2 3.2

1.8 Cough 1.9 3.2

1.4 Constipation 1.6 2.9

1.9 Dyslipidemia 1.4 2.7

1.5 Pharyngitis 1.1 2.7

1.5 Increased urination Increased urination includes the following adverse reactions, listed in order of frequency reported: pollakiuria, polyuria, and urine output increased. 1.4 2.4

2.6 Discomfort with urination 1.1 2.2

1.6 Pool of 12 Placebo-Controlled Adult Trials for Dapagliflozin 5 and 10 mg for Glycemic Control The data in Table 3 are derived from 12 glycemic control placebo-controlled trials in adults ranging from 12 to 24 weeks. In 4 trials dapagliflozin was used as monotherapy, and in 8 trials dapagliflozin was used as add-on to background antidiabetic therapy or as combination therapy with metformin HCl [see Clinical Studies (14.1) ] . These data reflect exposure of 2338 adult patients to dapagliflozin with a mean exposure duration of 21 weeks. Patients received placebo (N=1393), dapagliflozin 5 mg (N=1145), or dapagliflozin 10 mg (N=1193) once daily. The mean age of the population was 55 years and 2% were older than 75 years of age. Fifty percent (50%) of the population were male; 81% were White, 14% were Asian, and 3% were Black or African American. At baseline, the population had diabetes for an average of 6 years, had a mean HbA1c of 8.3%, and 21% had established microvascular complications of diabetes. […]

Table 6: Clinically Relevant Interactions with XIGDUO XR Carbonic Anhydrase Inhibitors Clinical Impact Topiramate or other carbonic anhydrase inhibitors (e.g., zonisamide, acetazolamide or dichlorphenamide) frequently causes a decrease in serum bicarbonate and induce non-anion gap, hyperchloremic metabolic acidosis. Concomitant use of these drugs with XIGDUO XR may increase the risk for lactic acidosis. Intervention Consider more frequent monitoring of these patients. Drugs that Reduce Metformin Clearance Clinical Impact Concomitant use of drugs that interfere with common renal tubular transport systems involved in the renal elimination of metformin (e.g., organic cationic transporter-2 [OCT2]/multidrug and toxin extrusion [MATE] inhibitors, such as ranolazine, vandetanib, dolutegravir, and cimetidine) could increase systemic exposure to metformin and may increase the risk for lactic acidosis [see Clinical Pharmacology (12.3) ] . Intervention Consider the benefits and risks of concomitant use. Alcohol Clinical Impact Alcohol is known to potentiate the effect of metformin on lactate metabolism. Intervention Warn patients against excessive alcohol intake while receiving XIGDUO XR. Insulin or Insulin Secretagogues Clinical Impact The risk of hypoglycemia may be increased when XIGDUO XR is used concomitantly with insulin or insulin secretagogues (e.g., sulfonylurea) [see Warnings and Precautions (5.5) ]. Intervention Concomitant use may require lower doses of insulin or the insulin secretagogue to reduce the risk of hypoglycemia. Drugs Affecting Glycemic Control Clinical Impact Certain drugs tend to produce hyperglycemia and may lead to loss of glycemic control. These medications include thiazides and other diuretics, corticosteroids, phenothiazines, thyroid products, estrogens, oral contraceptives, phenytoin, nicotinic acid, sympathomimetics, calcium channel blocking drugs, and isoniazid. Intervention When such drugs are administered to a patient receiving XIGDUO XR, observe the patient closely for loss of blood glucose control. When such drugs are withdrawn from a patient receiving XIGDUO XR, observe the patient closely for hypoglycemia. Lithium Clinical Impact Concomitant use of an SGLT2 inhibitor with lithium may decrease serum lithium concentrations. Intervention Monitor serum lithium concentration more frequently during XIGDUO XR initiation and dosage changes. Positive Urine Glucose Test Clinical Impact SGLT2 inhibitors increase urinary glucose excretion and will lead to positive urine glucose tests. Intervention Monitoring glycemic control with urine glucose tests is not recommended in patients taking SGLT2 inhibitors. Use alternative methods to monitor glycemic control. Interference with 1,5-anhydroglucitol (1,5-AG) Assay Clinical Impact Measurements of 1,5-AG are unreliable in assessing glycemic control in patients taking SGLT2 inhibitors. Intervention Monitoring glycemic control with 1,5-AG assay is not recommended. Use alternative methods to monitor glycemic control.

• Carbonic anhydrase inhibitors: May increase risk of lactic acidosis. Consider more frequent monitoring. (7)
• Drugs that reduce metformin clearance: May increase risk of lactic acidosis. Consider benefits and risks of concomitant use. (7)
• See full prescribing information for additional drug interactions and information on interference of XIGDUO XR with laboratory tests. ( 7 )

• Pregnancy: Advise females of the potential risk to a fetus, especially during the second and third trimesters. (8.1)
• Lactation: Not recommended when breastfeeding. (8.2)
• Females and Males of Reproductive Potential: Advise premenopausal females of the potential for an unintended pregnancy. (8.3)
• Geriatrics: Higher incidence of adverse reactions related to hypotension. Assess renal function more frequently. ( 8.5 , 8.6 )
• Renal Impairment: Higher incidence of adverse reactions related to volume depletion. ( 8.6 )
• Hepatic Impairment: Avoid use in patients with hepatic impairment. (8.7)

8.1 Pregnancy Risk Summary Based on animal data showing adverse renal effects, XIGDUO XR is not recommended during the second and third trimesters of pregnancy. Limited data with XIGDUO XR or dapagliflozin in pregnant women are not sufficient to determine drug‑associated risk for major birth defects or miscarriage. Published studies with metformin use during pregnancy have not reported a clear association with metformin and major birth defect or miscarriage risk (see Data) . There are risks to the mother and fetus associated with poorly controlled diabetes in pregnancy (see Clinical Considerations) . In animal studies, adverse renal pelvic and tubule dilatations, that were not fully reversible, were observed in rats when dapagliflozin was administered during a period of renal development corresponding to the late second and third trimesters of human pregnancy, at all doses tested; the lowest of which provided an exposure 15-times the 10 mg clinical dose (see Data) . The estimated background risk of major birth defects is 6 to 10% in women with pre-gestational diabetes with a HbA1c greater than 7% and has been reported to be as high as 20 to 25% in women with HbA1c greater than 10%. The estimated background risk of miscarriage for the indicated population is unknown. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2 to 4% and 15 to 20%, respectively. Clinical Considerations Disease-associated maternal and/or embryofetal risk Poorly controlled diabetes in pregnancy increases the maternal risk for diabetic ketoacidosis, preeclampsia, spontaneous abortions, preterm delivery and delivery complications. Poorly controlled diabetes increases the fetal risk for major birth defects, stillbirth, and macrosomia related morbidity. Data Human Data Published data from post-marketing studies have not reported a clear association with metformin and major birth defects, miscarriage, or adverse maternal or fetal outcomes when metformin was used during pregnancy. However, these studies cannot definitely establish the absence of any metformin-associated risk because of methodological limitations, including small sample size and inconsistent comparator groups. Animal Data Dapagliflozin Dapagliflozin dosed directly to juvenile rats from postnatal day (PND) 21 until PND 90 at doses of 1, 15, or 75 mg/kg/day, increased kidney weights and increased the incidence of renal pelvic and tubular dilatations at all dose levels. Exposure at the lowest dose tested was 15-times the 10 mg clinical dose (based on AUC). The renal pelvic and tubular dilatations observed in juvenile animals did not fully reverse within a 1-month recovery period. In a prenatal and postnatal development study, dapagliflozin was administered to maternal rats from gestation day 6 through lactation day 21 at doses of 1, 15, or 75 mg/kg/day, and pups were indirectly exposed in utero and throughout lactation. Increased incidence or severity of renal pelvic dilatation was observed in 21-day-old pups offspring of treated dams at 75 mg/kg/day (maternal and pup dapagliflozin exposures were 1415-times and 137-times, respectively, the human values at the 10 mg clinical dose, based on AUC). Dose-related reductions in pup body weights were observed at greater or equal to 29-times the 10 mg clinical dose (based on AUC). No adverse effects on developmental endpoints were noted at 1 mg/kg/day (19-times the 10 mg clinical dose, based on AUC). These outcomes occurred with drug exposure during periods of renal development in rats that corresponds to the late second and third trimester of human development. In embryofetal development studies in rats and rabbits, dapagliflozin was administered throughout organogenesis, corresponding to the first trimester of human pregnancy. In rats, dapagliflozin was neither embryolethal nor teratogenic at doses up to 75 mg/kg/day (1441-times the 10 mg clinical dose, based on AUC). Dose‑related effects on the rat fetus (structural abnormalities and reduced body weight) occurred only at higher dosages, equal to or greater than 150 mg/kg (more than 2344-times the 10 mg clinical dose, based on AUC), which were associated with maternal toxicity. No developmental toxicities were observed in rabbits at doses up to 180 mg/kg/day (1191-times the 10 mg clinical dose, based on AUC). Metformin HCl Metformin HCl did not cause adverse developmental effects when administered to pregnant Sprague Dawley rats and rabbits up to 600 mg/kg/day during the period of organogenesis. This represents an exposure of about 2- and 6-times a 2,000 mg clinical dose based on body surface area (mg/m 2 ) for rats and rabbits, respectively. Determination of fetal concentrations demonstrated a partial placental barrier to metformin.

8.2 Lactation Risk Summary There is no information regarding the presence of XIGDUO XR or dapagliflozin in human milk, the effects on the breastfed infant, or the effects on milk production. Limited published studies report that metformin is present in human milk (see Data) . However, there is insufficient information on the effects of metformin on the breastfed infant and no available information on the effects of metformin on milk production. Dapagliflozin is present in the milk of lactating rats (see Data) . However, due to species specific differences in lactation physiology, the clinical relevance of these data is not clear. Since human kidney maturation occurs in utero and during the first 2 years of life when lactational exposure may occur, there may be risk to the developing human kidney. Because of the potential for serious adverse reactions in breastfed infants, advise women that use of XIGDUO XR is not recommended while breastfeeding. Data Dapagliflozin Dapagliflozin was present in rat milk at a milk/plasma ratio of 0.49, indicating that dapagliflozin and its metabolites are transferred into milk at a concentration that is approximately 50% of that in maternal plasma. Juvenile rats directly exposed to dapagliflozin showed risk to the developing kidney (renal pelvic and tubular dilatations) during maturation. Metformin HCl Published clinical lactation studies report that metformin is present in human milk which resulted in infant doses approximately 0.11% to 1% of the maternal weight-adjusted dosage and a milk/plasma ratio ranging between 0.13 and 1. However, the studies were not designed to definitely establish the risk of use of metformin during lactation because of small sample size and limited adverse event data collected in infants.

8.3 Females and Males of Reproductive Potential Discuss the potential for unintended pregnancy with premenopausal women as therapy with metformin may result in ovulation in some anovulatory women.

8.4 Pediatric Use The safety and effectiveness of XIGDUO XR as an adjunct to diet and exercise to improve glycemic control in type 2 diabetes mellitus have been established in pediatric patients aged 10 years and older. Use of XIGDUO XR for this indication is supported by a 26‑week placebo-controlled trial of dapagliflozin with a 26‑week extension in 157 pediatric patients aged 10 to 17 years with type 2 diabetes mellitus, pediatric pharmacokinetic data, and trials in adults with type 2 diabetes mellitus [see Clinical Pharmacology (12.3) and Clinical Studies (14.1 , 14.2) ] . […]

Dapagliflozin 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, and decreased intraglomerular pressure which is believed to be mediated by increased tubuloglomerular feedback. Metformin HCl Metformin is an antihyperglycemic agent which improves glucose tolerance in patients with type 2 diabetes mellitus, lowering both basal and postprandial plasma glucose. Metformin decreases hepatic glucose production, decreases intestinal absorption of glucose, and improves insulin sensitivity by increasing peripheral glucose uptake and utilization. With metformin therapy, insulin secretion remains unchanged while fasting insulin levels and day-long plasma insulin response may decrease.