Ertugliflozin and Metformin
(er too gli FLOE zin & met FOR min)
- Metformin and Ertugliflozin
Excipient information presented when available (limited, particularly for generics); consult specific product labeling.
Segluromet: Ertugliflozin 2.5 mg and metformin hydrochloride 500 mg, Ertugliflozin 7.5 mg and metformin hydrochloride 500 mg, Ertugliflozin 2.5 mg and metformin hydrochloride 1000 mg, Ertugliflozin 7.5 mg and metformin hydrochloride 1000 mg
Brand Names: U.S.
- Antidiabetic Agent, Biguanide
- Antidiabetic Agent, Sodium-Glucose Cotransporter 2 (SGLT2) Inhibitor
- Sodium-Glucose Cotransporter 2 (SGLT2) Inhibitor
Ertugliflozin: By inhibiting sodium-glucose cotransporter 2 (SGLT2) in the proximal renal tubules, ertugliflozin reduces reabsorption of filtered glucose from the tubular lumen and lowers the renal threshold for glucose (RTG). SGLT2 is the main site of filtered glucose reabsorption; reduction of filtered glucose reabsorption and lowering of RTG result in increased urinary excretion of glucose, thereby reducing plasma glucose concentrations.
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: As an adjunct to diet and exercise to improve glycemic control in adults with type 2 diabetes mellitus who are not adequately controlled on a regimen containing ertugliflozin or metformin or who are already treated with both ertugliflozin and metformin
History of serious hypersensitivity to ertugliflozin, metformin, or any component of the formulation; severe renal impairment (eGFR <30 mL/minute/1.73 m2), ESRD, or dialysis; acute or chronic metabolic acidosis (including diabetic ketoacidosis, with or without coma)
Note: If present, correct volume depletion prior to initiation.
Diabetes mellitus, type 2: Oral:
Initial: Individualize initial dose based on patient's current antidiabetic regimen. May gradually increase dose based on effectiveness and tolerability.
Patients initiating ertugliflozin and already taking metformin: Ertugliflozin 5 mg/day plus a similar total daily dose of metformin, administered in 2 divided doses
Patients initiating metformin and already taking ertugliflozin: Metformin 1,000 mg/day plus a similar total daily dose of ertugliflozin, administered in 2 divided doses.
Patients already taking ertugliflozin and metformin: Administer the same total daily dose of ertugliflozin and a similar total daily dose of metformin in 2 divided doses
Maximum: Ertugliflozin 15 mg/metformin 2,000 mg per day
Refer to adult dosing. Metformin initial and maintenance dosing should be conservative, due to the potential for decreased renal function (monitor).
Dosing: Renal Impairment
eGFR ≥60 mL/minute/1.73 m2: No dosage adjustment necessary.
eGFR 30 to <60 mL/minute/1.73 m2: Not recommended for initiation of therapy in preexisting impairment or continued use when eGFR is persistently within this range during therapy.
eGFR <30 mL/minute/1.73 m2: Use is contraindicated.
ESRD or dialysis: Use is contraindicated.
Dosing: Hepatic Impairment
The manufacturer recommends avoiding metformin because liver disease is considered a risk factor for the development of lactic acidosis during metformin therapy. However, continued use of metformin in patients with diabetes 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). For ertugliflozin, no dosage adjustment is necessary in patients with mild or moderate hepatic impairment according to the manufacturer's labeling; use of ertugliflozin is not recommended in severe hepatic impairment (has not been studied) (Steglatro product labeling 2017).
Oral: Administer twice daily with meals.
Dietary modification based on ADA recommendations is a part of therapy. Metformin may cause GI upset; take with food (to decrease GI upset). Monitor for signs and symptoms of vitamin B12 and/or folic acid deficiency; supplementation may be required.
Store at 20°C to 25°C (68°F to 77°F); excursions permitted between 15°C and 30°C (between 59°F and 86°F). Protect from moisture.
Abemaciclib: May increase the serum concentration of MetFORMIN. Monitor therapy
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
Bictegravir: May increase the serum concentration of MetFORMIN. 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
Dalfampridine: MetFORMIN may increase the serum concentration of Dalfampridine. Dalfampridine may increase the serum concentration of MetFORMIN. 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 with dolutegravir. Monitor for increased metformin effects/toxicities during concomitant use. Consider therapy modification
Glycopyrrolate (Systemic): May increase the serum concentration of MetFORMIN. Monitor therapy
Guanethidine: May enhance the hypoglycemic effect of Antidiabetic Agents. 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
Insulins: Sodium-Glucose Cotransporter 2 (SLGT2) Inhibitors may enhance the hypoglycemic effect of Insulins. Management: Consider a decrease in insulin dose when initiating therapy with a sodium-glucose cotransporter 2 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; Diatrizoate Sodium; Ethiodized Oil. Consider therapy modification
Isavuconazonium Sulfate: May increase the serum concentration of MetFORMIN. 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
Monoamine Oxidase Inhibitors: May enhance the hypoglycemic effect of Blood Glucose Lowering Agents. Monitor therapy
Ombitasvir, Paritaprevir, and Ritonavir: May enhance the adverse/toxic effect of MetFORMIN. Specifically, the risk for lactic acidosis may be increased. Monitor therapy
Ombitasvir, Paritaprevir, Ritonavir, and Dasabuvir: May enhance the adverse/toxic effect of MetFORMIN. Specifically, the risk for lactic acidosis may be increased. Monitor therapy
Ondansetron: May increase the serum concentration of MetFORMIN. 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
Prothionamide: May enhance the hypoglycemic effect of Blood Glucose Lowering Agents. Monitor therapy
Quinolones: May enhance the hypoglycemic effect of Blood Glucose Lowering Agents. Quinolones 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
Ritodrine: May diminish the therapeutic effect of Antidiabetic Agents. Monitor therapy
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
Sulfonylureas: Sodium-Glucose Cotransporter 2 (SLGT2) Inhibitors may enhance the hypoglycemic effect of Sulfonylureas. Management: Consider a decrease in sulfonylurea dose when initiating therapy with a sodium-glucose cotransporter 2 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
Positive test for glucosuria; ertugliflozin may interfere with 1,5-anhydroglucitol (1,5-AG) assay; use alternative methods to monitor glycemic control.
See individual agents.
Concerns related to adverse effects:
• Bone fractures: An increased incidence of bone fractures has been observed with other sodium-glucose cotransporter 2 (SGLT2) inhibitors in some clinical trials. However, meta-analyses of trial data for canagliflozin, dapagliflozin, and empagliflozin have not demonstrated increased risk of fracture overall (Ruanpeng 2017; Tang 2016). One placebo-controlled trial with ertugliflozin did not show changes in bone mineral density (BMD) after 26 weeks, but additional longer-term data are required to more accurately define fracture risk (Rosenstock 2017).
• Genital mycotic infections: Ertugliflozin may increase the risk of genital mycotic infections (eg, vulvovaginal mycotic infection, vulvovaginal candidiasis, vulvovaginitis, candida balanitis, balanoposthitis). Patients with a history of these infections or uncircumcised males are at greater risk.
• Hypotension: Ertugliflozin may cause symptomatic hypotension due to intravascular volume depletion especially in patients with renal impairment (ie, eGFR <60 mL/minute/1.73 m2), elderly, patients on other antihypertensives (eg, diuretics, ACE inhibitors, or angiotensin receptor blockers [ARBs]), or those with low systolic blood pressure. Assess volume status prior to initiation in patients at risk of hypotension and correct if depleted; monitor for signs and symptoms of hypotension after initiation.
• Ketoacidosis: Cases of ketoacidosis (some fatal) have been reported in patients with type 1 and type 2 diabetes mellitus receiving SGLT2 inhibitors; in some cases, patients have presented with normal or only modestly elevated blood glucose (<250 mg/dL) (Bobart 2016; FDA 2015; Handelsman 2016). Before initiating treatment, consider risk factors that may predispose to ketoacidosis (eg, pancreatic insulin deficiency, dose decreases or discontinuation of insulin, caloric restriction, alcohol abuse, extensive exercise, MI, stroke, severe infection, surgery, any other extreme stress event) (Handelsman 2016). The American Association of Clinical Endocrinologists and American College of Endocrinology recommend considering withholding of SGLT2 inhibitors for at least 24 hours prior to events that may precipitate diabetic ketoacidosis (Handelsman 2016), while others have suggested withholding for 3 to 5 days (Bobart 2016). Patients presenting with nausea/vomiting, abdominal pain, generalized malaise, and/or shortness of breath should be assessed immediately for ketoacidosis; discontinue therapy and treat promptly if ketoacidosis is suspected.
• 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 of age, 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 should be suspected in any patient with diabetes receiving metformin with evidence of acidosis but without evidence of ketoacidosis. Discontinue use in patients with conditions associated with dehydration, hypoperfusion, sepsis, or hypoxemia. Temporarily discontinue therapy in patients with restricted food and fluid intake. The risk of accumulation and lactic acidosis increases with the degree of impairment of renal function.
• Lipid abnormality: Ertugliflozin may cause dose-related LDL-C elevation; monitor LDL-C and treat as needed.
• Lower limb amputation: An increased risk for lower limb amputation (primarily of the toe) has been observed with another SGLT2 inhibitor. In clinical trials, the incidence of nontraumatic lower limb amputations observed with ertugliflozin was ≤0.5% though a causal relationship has not been confirmed. Prior to initiation consider risk factors for amputation including prior amputation, peripheral vascular disease, neuropathy, and diabetic foot ulcers. Counsel patients about the importance of preventative foot care. Monitor for, and discontinue therapy if any of the following occur: signs and symptoms of new infection (including osteomyelitis), new pain or tenderness, or sores/ulcers involving the lower limbs.
• Renal effects: Acute kidney injury has been reported with SGLT2 inhibitors. Prior to initiation, consider risk factors for acute kidney injury (eg, hypovolemia, chronic renal insufficiency, heart failure, use of concomitant medications [eg, diuretics, ACE inhibitors, ARBs, or NSAIDs]). Temporarily discontinue use with reduced oral intake or fluid losses; discontinue use if acute kidney injury occurs. Additional abnormalities in renal function (decreased eGFR, increased serum creatinine) and adverse effects related to renal function may occur. Assess renal function prior to initiation and periodically during treatment.
• Urinary tract infection: Serious urinary infections including urosepsis and pyelonephritis requiring hospitalization have been reported; treatment with SGLT2 inhibitors increase the risk for urinary tract infections (UTI); monitor for signs and symptoms of UTI and treat as needed.
• Vitamin B12 concentrations: Long-term metformin use is associated with vitamin B12 deficiency; monitor vitamin B12 serum concentrations periodically with long-term therapy. Monitoring of B12 serum concentrations should be considered in all patients receiving metformin and in particular those with peripheral neuropathy or anemia (ADA 2018c).
• Heart failure: Metformin may be used in patients with stable heart failure (HF); avoid use in unstable or hospitalized patients with HF (ADA 2018e). Risk of lactic acidosis may be increased secondary to hypoperfusion. In a scientific statement from the American Heart Association, metformin has been determined to be an agent that may exacerbate underlying myocardial dysfunction (magnitude: major) (AHA [Page 2016]). Use of metformin in patients with HF may be associated with reduced mortality and reduction in hospital readmission for HF (Crowley 2017; Eurich 2013).
• Hepatic impairment: The manufacturer recommends to generally avoid use in patients with hepatic impairment due to potential for lactic acidosis. However, continued use of metformin in patients with diabetes with liver dysfunction, including cirrhosis, may be associated with a survival benefit in carefully selected patients (Brackett 2010; Crowley 2017; Zhang 2014).
• Renal impairment: Metformin is substantially excreted by the kidney; assess renal function prior to initiation of therapy and periodically thereafter using estimated glomerular filtration rate (eGFR); the risk of metformin accumulation and lactic acidosis increases with degree of renal impairment. 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. Glycemic efficacy of ertugliflozin may be decreased in renal impairment. Use of ertugliflozin/metformin is not recommended if eGFR is between 30 to 60 mL/minute/1.73 m2 prior to initiation of therapy or if persistently in this range during therapy. Use is contraindicated in patients with eGFR <30 mL/minute/1.73 m2, ESRD, or maintained on dialysis.
• 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: Use with caution; risk of metformin associated lactic acidosis increases with age. Risk of intravascular volume depletion, renal impairment, and UTI may be increased in elderly patients.
• Appropriate use: Not indicated for use in patients with type 1 diabetes mellitus or with diabetic ketoacidosis (DKA).
• Ethanol use: Instruct patients to avoid excessive acute or chronic ethanol use; ethanol may potentiate metformin's effect on lactate metabolism.
• Iodinated contrast: According to the manufacturer, it is recommended to 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 2017).
• Patient education: Diabetes self-management education (DSME) is essential to maximize the effectiveness of therapy.
• Surgical procedures: Metformin should be withheld the day of surgery (all other oral hypoglycemic agents should be withheld the morning of surgery or procedure) (ADA 2018d). Restart only after normal oral intake resumed and normal renal function is verified.
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 2018a]); plasma glucose. Initial and periodic monitoring of hematologic parameters (eg, hemoglobin/hematocrit and red blood cell indices); renal function (eGFR) prior to therapy initiation 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]). Monitor vitamin B12 serum concentrations periodically with long-term therapy; folate (if megaloblastic anemia is suspected); volume status (eg, blood pressure, hematocrit, electrolytes); LDL-C; signs and symptoms of genital mycotic infections and urinary tract infection; signs and symptoms of metabolic acidosis; lower limb and feet (sores, ulcers, infection).
Metformin crosses the placenta (ADA 2018f). Refer to individual agents.
• 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, headache, abdominal pain, heartburn, or loss of strength and energy. Have patient report immediately to prescriber signs of lactic acidosis (fast breathing, tachycardia, abnormal heartbeat, vomiting, fatigue, shortness of breath, severe loss of strength and energy, severe dizziness, feeling cold, or muscle pain or cramps), signs of a urinary tract infection (hematuria, burning or painful urination, polyuria, fever, lower abdominal pain, or pelvic pain), signs of kidney problems (urinary retention, hematuria, change in amount of urine passed, or weight gain), signs of fluid and electrolyte problems (mood changes, confusion, muscle pain or weakness, abnormal heartbeat, severe dizziness, passing out, tachycardia, increased thirst, seizures, loss of strength and energy, lack of appetite, urinary retention or change in amount of urine passed, dry mouth, dry eyes, or nausea or vomiting), signs of low blood sugar (dizziness, headache, fatigue, feeling weak, shaking, tachycardia, confusion, increased hunger, or sweating), signs of acidosis (confusion, fast breathing, tachycardia, abnormal heartbeat, severe abdominal pain, nausea, vomiting, fatigue, shortness of breath, or loss of strength and energy), vaginal yeast infection, penile yeast infection, or lower extremity pain, tenderness, sores, or infection (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.
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