Saxagliptin and Metformin
(sax a GLIP tin & met FOR min)
- Metformin and Saxagliptin
- Metformin Hydrochloride and Saxagliptin
- Saxagliptin and Metformin Hydrochloride
- Saxagliptin HCl/Metformin HCl
Excipient information presented when available (limited, particularly for generics); consult specific product labeling.
Tablet, variable release, oral:
Kombiglyze XR 2.5/1000: Saxagliptin 2.5 mg [immediate release] and metformin hydrochloride 1000 mg [extended release]
Kombiglyze XR 5/500: Saxagliptin 5 mg [immediate release] and metformin hydrochloride 500 mg [extended release]
Kombiglyze XR 5/1000: Saxagliptin 5 mg [immediate release] and metformin hydrochloride 1000 mg [extended release]
Brand Names: U.S.
- Kombiglyze XR
- Antidiabetic Agent, Biguanide
- Antidiabetic Agent, Dipeptidyl Peptidase 4 (DPP-4) Inhibitor
Saxagliptin inhibits dipeptidyl peptidase IV (DPP-IV) enzyme resulting in prolonged active incretin levels. Incretin hormones (eg, glucagon-like peptide-1 [GLP-1] and glucose-dependent insulinotropic polypeptide [GIP]) regulate glucose homeostasis by increasing insulin synthesis and release from pancreatic beta cells and decreasing glucagon secretion from pancreatic alpha cells. Decreased glucagon secretion results in decreased hepatic glucose production. Under normal physiologic circumstances, incretin hormones are released by the intestine throughout the day and levels are increased in response to a meal; incretin hormones are rapidly inactivated by the DPP-IV enzyme.
Metformin decreases hepatic glucose production, decreasing intestinal absorption of glucose and improves insulin sensitivity (increases peripheral glucose uptake and utilization).
Use: Labeled Indications
Diabetes mellitus, type 2: Management of adults with type 2 diabetes mellitus (noninsulin dependent, NIDDM) as an adjunct to diet and exercise when treatment with both saxagliptin and metformin is appropriate
US labeling: History of serious hypersensitivity reaction (eg, anaphylaxis, angioedema, exfoliative skin conditions) to saxagliptin, metformin, or any component of the formulation; severe renal impairment (eGFR <30 mL/minute/1.73 m2); acute or chronic metabolic acidosis including diabetic ketoacidosis
Canadian labeling: Hypersensitivity to saxagliptin, another dipeptidyl peptidase-4 inhibitor, metformin, or any component of the formulation; unstable and/or insulin-dependent (Type 1) diabetes mellitus; acute or chronic metabolic acidosis, including diabetic ketoacidosis, with or without coma, history of ketoacidosis with or without coma; history of lactic acidosis (regardless of precipitating factors); presence of renal disease or impairment and patients with serum creatinine levels above the upper limit of normal range or abnormal creatinine clearance (<60 mL/minute), which may also result from conditions such as cardiovascular collapse, acute myocardial infarction, and septicemia or when renal function is unknown; excessive ethanol intake (acute or chronic); moderate and severe hepatic impairment; cases of cardiovascular collapse and disease states associated with hypoxemia such as cardiorespiratory insufficiency which are often associated with hyperlactacidemia; during stress conditions (eg, severe infection, trauma, surgery and postoperative recovery phase); severe dehydration; pregnancy; breast-feeding
Diabetes mellitus, type 2: Oral:
Extended release (ER) formulation: Note: Initial doses should be based on current daily dose of saxagliptin and metformin. Daily dose should generally be administered once daily. Maximum: Saxagliptin 5 mg/metformin 2,000 mg ER per day.
Patients inadequately controlled on metformin alone: Initial: Saxagliptin 2.5 to 5 mg once daily plus current daily dose of metformin. Patients who require saxagliptin 2.5 mg and metformin >1,000 mg/day should not be switched to the combination product.
Patients inadequately controlled on saxagliptin 5 mg alone: Initial dose: Saxagliptin 5 mg/metformin 500 mg ER once daily. Patients who require saxagliptin 2.5 mg and are metformin-naïve or require metformin >1,000 mg/day should not be switched to the combination product.
Concomitant use with strong CYP3A4/5 inhibitors: Maximum: Saxagliptin 2.5 mg/metformin 1,000 mg once daily
Concomitant use with insulin or insulin secretagogues: Reduced dose of insulin or insulin secretagogues (eg, sulfonylureas) may be needed.
Immediate release formulation [Canadian product]: Initial doses should be based on current dose of saxagliptin and metformin; daily dose should be divided into 2 equal doses given with meals. Maximum: Saxagliptin 5 mg/metformin 2,000 mg per day
Patients inadequately controlled on metformin alone: Initial dose: Saxagliptin 2.5 mg twice daily plus current dose of metformin.
Concomitant use with insulin: Reduced dose of insulin may be needed.
Refer to adult dosing. The initial and maintenance dosing should be conservative, due to the potential for decreased renal function (monitor).
Dosing: Renal Impairment
eGFR >45 mL/minute/1.73 m2: No dosage adjustment necessary; monitor renal function at least annually.
eGFR 30 to 45 mL/minute/1.73 m2: Use is not recommended for initiation of therapy; if eGFR falls to <45 mL/minute/1.73 m2 during therapy, consider benefits/risks of continuing therapy and limit saxagliptin dose to 2.5 mg once daily.
eGFR <30 mL/minute/1.73 m2: Use is contraindicated.
Dosing: Hepatic Impairment
The manufacturer recommends to avoid metformin since liver disease is considered a risk factor for the development of lactic acidosis during metformin therapy. However, continued use of metformin in diabetics with liver dysfunction, including cirrhosis, has been used successfully and may be associated with a survival benefit in carefully selected patients; use cautiously in patients at risk for lactic acidosis (eg, renal impairment, alcohol use) (Brackett 2010; Zhang 2014).
Oral: Administer extended release (ER) tablets once daily with the evening meal. Swallow whole; do not crush, cut, or chew ER tablets.
Immediate release formulation [Canadian product] should be administered twice daily with meals (eg, breakfast and dinner).
Store at 20°C to 25°C (68°F to 77°F); excursions permitted between 15°C to 30°C (59°F to 86°F).
Alcohol (Ethyl): May enhance the adverse/toxic effect of MetFORMIN. Specifically, alcohol may potentiate the risk of lactic acidosis Avoid combination
Alpha-Lipoic Acid: May enhance the hypoglycemic effect of Antidiabetic Agents. Monitor therapy
Androgens: May enhance the hypoglycemic effect of Blood Glucose Lowering Agents. Exceptions: Danazol. Monitor therapy
Aprepitant: May increase the serum concentration of CYP3A4 Substrates. Monitor therapy
BuPROPion: May increase the serum concentration of OCT2 Substrates. Monitor therapy
Carbonic Anhydrase Inhibitors: May enhance the adverse/toxic effect of MetFORMIN. Specifically, the risk of developing lactic acidosis may be increased. Exceptions: Brinzolamide; Dorzolamide. Monitor therapy
Cephalexin: May increase the serum concentration of MetFORMIN. Monitor therapy
Cimetidine: May increase the serum concentration of MetFORMIN. Management: Consider alternatives to cimetidine in patients receiving metformin due to a potential for increased metformin concentrations and toxicity (including lactic acidosis). Consider therapy modification
Conivaptan: May increase the serum concentration of CYP3A4 Substrates. Avoid combination
CYP3A4 Inducers: May decrease the serum concentration of SAXagliptin. Monitor therapy
CYP3A4 Inhibitors (Moderate): May increase the serum concentration of SAXagliptin. Monitor therapy
CYP3A4 Inhibitors (Strong): May increase the serum concentration of SAXagliptin. Management: Saxagliptin U.S. product labeling recommends limiting saxagliptin adult dose to 2.5 mg/day when used with a strong CYP3A4 inhibitor. Monitor for increased saxagliptin levels/effects. A similar recommendation is not made in the Canadian product labeling. Consider therapy modification
Dalfampridine: MetFORMIN may increase the serum concentration of Dalfampridine. Dalfampridine may increase the serum concentration of MetFORMIN. Monitor therapy
Dasatinib: May increase the serum concentration of CYP3A4 Substrates. Monitor therapy
Dofetilide: MetFORMIN may increase the serum concentration of Dofetilide. Monitor therapy
Dolutegravir: May increase the serum concentration of MetFORMIN. Management: Limit the daily metformin dose to 1,000 mg when used together with dolutegravir. Metformin dose adjustments may also be needed upon discontinuation of dolutegravir. Monitor patient response to metformin closely. Consider therapy modification
Fosaprepitant: May increase the serum concentration of CYP3A4 Substrates. Monitor therapy
Fusidic Acid (Systemic): May increase the serum concentration of CYP3A4 Substrates. Avoid combination
Glycopyrrolate (Systemic): May increase the serum concentration of MetFORMIN. Monitor therapy
Hyperglycemia-Associated Agents: May diminish the therapeutic effect of Antidiabetic Agents. Monitor therapy
Hypoglycemia-Associated Agents: Antidiabetic Agents may enhance the hypoglycemic effect of Hypoglycemia-Associated Agents. Monitor therapy
Idelalisib: May increase the serum concentration of CYP3A4 Substrates. Avoid combination
Insulin: DPP-IV Inhibitors may enhance the hypoglycemic effect of Insulin. Management: Consider a decrease in insulin dose when initiating therapy with a dipeptidyl peptidase-IV inhibitor and monitor patients for hypoglycemia. Consider therapy modification
Iodinated Contrast Agents: May enhance the adverse/toxic effect of MetFORMIN. Renal dysfunction that may be caused by iodinated contrast agents may lead to metformin-associated lactic acidosis. Management: Management advice varies. Refer to the full drug interaction monograph content for details. Exceptions: Diatrizoate Meglumine; Ethiodized Oil. Consider therapy modification
Isavuconazonium Sulfate: May increase the serum concentration of MetFORMIN. Monitor therapy
Ivacaftor: May increase the serum concentration of CYP3A4 Substrates. Monitor therapy
LamoTRIgine: May increase the serum concentration of MetFORMIN. Management: The lamotrigine Canadian product monograph states that coadministration of these drugs is not recommended. Monitor therapy
Lumacaftor: May decrease the serum concentration of P-glycoprotein/ABCB1 Substrates. Lumacaftor may increase the serum concentration of P-glycoprotein/ABCB1 Substrates. Monitor therapy
MAO Inhibitors: May enhance the hypoglycemic effect of Blood Glucose Lowering Agents. Monitor therapy
MiFEPRIStone: May increase the serum concentration of CYP3A4 Substrates. Management: Minimize doses of CYP3A4 substrates, and monitor for increased concentrations/toxicity, during and 2 weeks following treatment with mifepristone. Avoid cyclosporine, dihydroergotamine, ergotamine, fentanyl, pimozide, quinidine, sirolimus, and tacrolimus. Consider therapy modification
Netupitant: May increase the serum concentration of CYP3A4 Substrates. Monitor therapy
Ondansetron: May increase the serum concentration of MetFORMIN. Monitor therapy
Palbociclib: May increase the serum concentration of CYP3A4 Substrates. Monitor therapy
Patiromer: May decrease the serum concentration of MetFORMIN. Management: Administer metformin at least 3 hours before or 3 hours after patiromer. Consider therapy modification
Pegvisomant: May enhance the hypoglycemic effect of Blood Glucose Lowering Agents. Monitor therapy
P-glycoprotein/ABCB1 Inhibitors: May increase the serum concentration of P-glycoprotein/ABCB1 Substrates. P-glycoprotein inhibitors may also enhance the distribution of p-glycoprotein substrates to specific cells/tissues/organs where p-glycoprotein is present in large amounts (e.g., brain, T-lymphocytes, testes, etc.). Monitor therapy
Quinolone Antibiotics: May enhance the hypoglycemic effect of Blood Glucose Lowering Agents. Quinolone Antibiotics may diminish the therapeutic effect of Blood Glucose Lowering Agents. Specifically, if an agent is being used to treat diabetes, loss of blood sugar control may occur with quinolone use. Monitor therapy
Ranolazine: May increase the serum concentration of MetFORMIN. Management: Limit the metformin dose to a maximum of 1700 mg/day when used together with ranolazine 1000 mg twice daily. Consider therapy modification
Salicylates: May enhance the hypoglycemic effect of Blood Glucose Lowering Agents. Monitor therapy
Selective Serotonin Reuptake Inhibitors: May enhance the hypoglycemic effect of Blood Glucose Lowering Agents. Monitor therapy
Simeprevir: May increase the serum concentration of CYP3A4 Substrates. Monitor therapy
Stiripentol: May increase the serum concentration of CYP3A4 Substrates. Management: Use of stiripentol with CYP3A4 substrates that are considered to have a narrow therapeutic index should be avoided due to the increased risk for adverse effects and toxicity. Any CYP3A4 substrate used with stiripentol requires closer monitoring. Consider therapy modification
Sulfonylureas: DPP-IV Inhibitors may enhance the hypoglycemic effect of Sulfonylureas. Management: Consider a decrease in sulfonylurea dose when initiating therapy with a dipeptidyl peptidase-IV inhibitor and monitor patients for hypoglycemia. Consider therapy modification
Thiazide and Thiazide-Like Diuretics: May diminish the therapeutic effect of Antidiabetic Agents. Monitor therapy
Topiramate: May enhance the adverse/toxic effect of MetFORMIN. Monitor therapy
Trimethoprim: May increase the serum concentration of MetFORMIN. Monitor therapy
Trospium: MetFORMIN may decrease the serum concentration of Trospium. Monitor therapy
Vandetanib: May increase the serum concentration of MetFORMIN. Monitor therapy
Verapamil: May diminish the therapeutic effect of MetFORMIN. Monitor therapy
See individual agents.
Concerns related to adverse effects:
• Arthralgia: Severe and disabling arthralgia has been reported with DPP-IV inhibitor use; onset may occur within one day to years after treatment initiation and may resolve with discontinuation of therapy. Some patients may experience a recurrence of symptoms if DPP-IV inhibitor therapy resumed.
• Bullous pemphigoid: DPP-4 inhibitor use has been associated with development of bullous pemphigoid; cases have typically resolved with topical or systemic immunosuppressive therapy and discontinuation of DPP-4 inhibitor therapy. Advise patients to report development of blisters or erosions. Discontinue therapy if bullous pemphigoid is suspected and consider referral to a dermatologist.
• Hematologic: Dose-related decrease in lymphocyte count has been observed with saxagliptin; clinical significance is not known. Monitoring of lymphocyte counts may be warranted in patients with unusual or persistent infection.
• Hypersensitivity reactions: Rare hypersensitivity reactions, including anaphylaxis, angioedema, and exfoliative dermatologic reactions have been reported with saxagliptin use; discontinue if signs/symptoms of severe hypersensitivity reaction occur. Events have generally been noted within the first 3 months of therapy, and may occur with the initial dose. Use with caution if patient has experienced angioedema with other DPP-IV inhibitor use.
• Lactic acidosis: [US Boxed Warning]: Postmarketing cases of metformin-associated lactic acidosis have resulted in death, hypothermia, hypotension, and resistant bradyarrhythmias. The onset is often subtle, accompanied by nonspecific symptoms (eg, malaise, myalgias, respiratory distress, somnolence, abdominal pain); elevated blood lactate levels (>5 mmol/L); anion gap acidosis (without evidence of ketonuria or ketonemia); increased lactate; pyruvate ratio; metformin plasma levels generally >5 mcg/mL. Risk factors for lactic acidosis include patients with renal impairment, concomitant use of certain drugs (eg, carbonic anhydrase inhibitors such as topiramate), ≥65 years, having a radiologic study with contrast, surgery and other procedures, hypoxic states (eg, acute heart failure), excessive alcohol intake, and hepatic impairment. Discontinue immediately if lactic acidosis is suspected; prompt hemodialysis is recommended. Lactic acidosis is a rare, but potentially severe consequence of therapy with metformin that requires urgent care and hospitalization. The risk is increased in patients with acute congestive heart failure, dehydration, excessive alcohol intake, hepatic or renal impairment, or sepsis. Symptoms may be nonspecific (eg, abdominal distress, malaise, myalgia, respiratory distress, somnolence); low pH, increased anion gap and elevated blood lactate may be observed. Discontinue immediately if acidosis is suspected. Lactic acidosis should be suspected in any patient with diabetes receiving metformin with evidence of acidosis but without evidence of ketoacidosis. Discontinue metformin in patients with conditions associated with dehydration, sepsis, or hypoxemia. The risk of accumulation and lactic acidosis increases with the degree of impairment of renal function.
• Pancreatitis: Cases of acute pancreatitis have been reported with saxagliptin use. Monitor for signs/symptoms of pancreatitis; discontinue use immediately if pancreatitis is suspected and initiate appropriate management. Use with caution in patients with a history of pancreatitis as it is not known if this population is at greater risk.
• Vitamin B12 concentrations: May impair vitamin B12 absorption, particularly in those with inadequate vitamin B12or calcium intake/absorption; very rarely associated with anemia. Rapid reversal of vitamin B12 deficiency may be observed with discontinuation of therapy or supplementation. Monitor vitamin B12 serum concentrations periodically with long-term therapy.
• Heart failure: Heart failure that may require hospitalization has been reported with saxagliptin in a multi-center, randomized, double-blind, placebo-controlled trial in patients with type 2 diabetes with a history of, or at risk for, cardiovascular events; risk was increased in patients with preexisting heart failure or renal impairment and during the first 12 months of therapy (Scirica 2013; Scirica 2014). However, a population-based retrospective study in an ambulatory setting with relatively lower baseline cardiovascular risk factors failed to demonstrate increased risk in patients on saxagliptin compared to other agents (eg, sitagliptin, pioglitazone, sulfonylureas, insulin) (Toh 2016). Monitor for signs and symptoms of heart failure during therapy and consider discontinuation if condition develops. In a scientific statement from the American Heart Association, saxagliptin has been determined to be an agent that may exacerbate underlying myocardial dysfunction (magnitude: major) (AHA [Page 2016]).
• Hepatic impairment: Avoid use in patients with hepatic impairment due to potential for lactic acidosis.
• Renal impairment: Metformin is substantially excreted by the kidney and the risk of metformin accumulation and lactic acidosis increase with degree of renal impairment. Initiation of metformin is not recommended in patients with eGFR 30 to 45 mL/minute/1.73 m2 and its use is contraindicated if eGFR <30 mL/minute/1.73 m2. Use with caution and monitor renal function; assess more frequently in patients at increased risk of developing renal impairment (eg, elderly). Use of concomitant medications that may affect renal function (ie, affect tubular secretion) may also affect metformin disposition. Metformin should be withheld in patients with dehydration and/or prerenal azotemia.
• Stress-related states: It may be necessary to discontinue metformin and administer insulin if the patient is exposed to stress (fever, trauma, infection, surgery).
Concurrent drug therapy issues:
• Drug-drug interactions: Potentially significant interactions may exist, requiring dose or frequency adjustment, additional monitoring, and/or selection of alternative therapy. Consult drug interactions database for more detailed information.
• Elderly: Metformin should not be initiated in patients ≥80 years unless normal renal function is confirmed.
• Appropriate use: Not for use in patients with diabetic ketoacidosis (DKA) or patients with type 1 diabetes mellitus (insulin-dependent, IDDM).
• Ethanol use: Instruct patients to avoid excessive acute or chronic ethanol use; ethanol may potentiate metformin's effect on lactate metabolism.
• Iodinated contrast: Temporarily discontinue metformin at the time of or before iodinated contrast imaging procedures in patients with an eGFR 30 to 60 mL/minute/1.73 m2; or with a history of hepatic disease, alcoholism, or heart failure; or in patients who will receive intra-arterial iodinated contrast. Reevaluate eGFR 48 hours after imaging procedure; restart if renal function is stable. Alternatively, the American College of Radiology (ACR) guidelines recommend that metformin may be used prior to or following administration of iodinated contrast media in patients with no evidence of acute kidney injury (AKI) and with an eGFR ≥30 mL/minute/1.73 m2; ACR guidelines recommend temporary discontinuation of metformin in patients with known AKI or severe chronic kidney disease ([stage IV or V [ie, eGFR <30 mL/minute/1.73 m2]) or who are undergoing arterial catheter studies (ACR 2015).
• Patient education: Diabetes self-management education (DSME) is essential to maximize the effectiveness of therapy.
• Surgical procedures: Metformin therapy should be temporarily suspended for any surgical procedures requiring restricted intake of food and fluids due to increased risk for volume depletion, hypotension, and renal impairment.
Urine for glucose and ketones; plasma glucose; HbA1c (at least twice yearly in patients who have stable glycemic control and are meeting treatment goals; quarterly in patients not meeting treatment goals or with therapy change [ADA 2016a]); initial and periodic monitoring of hematologic parameters (eg, hemoglobin/hematocrit, red blood cell indices, and lymphocyte counts if unusual or persistent infection); hepatic function; renal function (eGFR) should be performed prior to initiation of therapy and at least annually (more often in patients at risk of developing renal impairment; every 3 to 6 months if eGFR 45 to <60 mL/minute/1.73 m2; every 3 months if eGFR 30 to <45 mL/minute/1.73 m2 [Lipska 2011]); vitamin B12 (periodically with long-term treatment); folate (if megaloblastic anemia is suspected); signs/symptoms of pancreatitis and/or heart failure
Pregnancy Risk Factor
Adverse events were not observed in animal reproduction studies conducted with this combination. Refer to individual monographs.
• Discuss specific use of drug and side effects with patient as it relates to treatment. (HCAHPS: During this hospital stay, were you given any medicine that you had not taken before? Before giving you any new medicine, how often did hospital staff tell you what the medicine was for? How often did hospital staff describe possible side effects in a way you could understand?)
• Patient may experience nausea, vomiting, diarrhea, flatulence, loss of strength and energy, headache, rhinitis, or rhinorrhea. Have patient report immediately to prescriber signs of too much lactic acid in the blood (lactic acidosis; fast breathing, fast heartbeat, abnormal heartbeat, vomiting, drowsiness, shortness of breath, feeling very tired or weak, severe dizziness, feeling cold, or muscle pain or cramps), angina, chills, pharyngitis, pain with urination, difficult urination, foul-smelling urine, signs of low blood sugar (dizziness, headache, fatigue, feeling weak, shaking, a fast heartbeat, confusion, hunger, or sweating), signs of a pancreas problem (pancreatitis; severe abdominal pain, severe back pain, severe nausea, vomiting), or severe joint pain (HCAHPS).
• Educate patient about signs of a significant reaction (eg, wheezing; chest tightness; fever; itching; bad cough; blue skin color; seizures; or swelling of face, lips, tongue, or throat). Note: This is not a comprehensive list of all side effects. Patient should consult prescriber for additional questions.
Intended Use and Disclaimer: Should not be printed and given to patients. This information is intended to serve as a concise initial reference for health care professionals to use when discussing medications with a patient. You must ultimately rely on your own discretion, experience, and judgment in diagnosing, treating, and advising patients.
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Other brands: Kombiglyze XR