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Linagliptin and Metformin

Generic name: linagliptin/metformin systemic

Brand names: Jentadueto, Jentadueto XR

Boxed Warning

Risk of lactic acidosis:

Postmarketing cases of metformin-associated lactic acidosis have resulted in death, hypothermia, hypotension, and resistant bradyarrhythmias. The onset of metformin-associated lactic acidosis is often subtle, accompanied only by nonspecific symptoms, such as malaise, myalgias, respiratory distress, somnolence, and abdominal pain. Metformin-associated lactic acidosis was characterized by elevated blood lactate levels (>5 mmol/L), anion gap acidosis (without evidence of ketonuria or ketonemia), an increased lactate/pyruvate ratio; and metformin plasma levels generally >5 mcg/mL.

Risk factors for metformin-associated lactic acidosis include renal impairment, concomitant use of certain drugs (eg, carbonic anhydrase inhibitors such as topiramate), age 65 years or older, having a radiological study with contrast, surgery and other procedures, hypoxic states (eg, acute congestive heart failure), excessive alcohol intake, and hepatic impairment.

Steps to reduce the risk of and manage metformin-associated lactic acidosis in these high risk groups are provided in the full prescribing information.

If metformin-associated lactic acidosis is suspected, immediately discontinue linagliptin and metformin and institute general supportive measures in a hospital setting. Prompt hemodialysis is recommended.

Dosage Forms

Excipient information presented when available (limited, particularly for generics); consult specific product labeling.

Tablet, oral:

Jentadueto 2.5/500: Linagliptin 2.5 mg and metformin hydrochloride 500 mg

Jentadueto 2.5/850: Linagliptin 2.5 mg and metformin hydrochloride 850 mg

Jentadueto 2.5/1000: Linagliptin 2.5 mg and metformin hydrochloride 1000 mg

Tablet Extended Release, oral:

Jentadueto XR 2.5/1000: Linagliptin 2.5 mg and metformin hydrochloride 1000 mg

Jentadueto XR 5/1000: Linagliptin 5 mg and metformin hydrochloride 1000 mg

Pharmacology

Mechanism of Action

Linagliptin inhibits dipeptidyl peptidase 4 (DPP-4) enzymes 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 DPP-4 enzymes.

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 when treatment with both linagliptin and metformin is appropriate.

Contraindications

US labeling: Hypersensitivity (eg, anaphylaxis, angioedema, exfoliative skin conditions, urticaria, bronchial hyperreactivity) to linagliptin, 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 linagliptin, metformin, or any component of the formulation; renal function unknown, renal disease or renal dysfunction (serum creatinine ≥136 micromole/L in males or ≥124 micromole/L in females), or abnormal creatinine clearance (<60 mL/minute) which may also result from conditions such as cardiovascular collapse, acute myocardial infarction, and septicemia; severe hepatic dysfunction; 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; excessive alcohol intake (acute or chronic); cardiovascular collapse and disease states associated with hypoxemia such as cardiorespiratory insufficiency that often are associated with hyperlactacidemia; stress conditions (eg, severe infection, trauma or surgery, and postoperative recovery phase); severe dehydration; pregnancy; breastfeeding

Dosage and Administration

Dosing: Adult

Diabetes mellitus, type 2: Oral: Initial doses should be based on current daily dose of linagliptin and metformin; range: Linagliptin 2.5 mg and metformin 500 to 1,000 mg twice daily (immediate release) or linagliptin 5 mg and metformin 1,000 to 2,000 mg once daily (extended release); maximum: linagliptin 5 mg/metformin 2,000 mg per day

Patients currently on metformin: Initial: Linagliptin 5 mg/day plus current daily dose of metformin

Patients not on metformin: Initial: Linagliptin 5 mg/metformin 1,000 mg per day

Conversion from immediate-release to extended-release product: May switch to extended-release product containing linagliptin 5 mg and current daily dose of metformin once daily.

Concomitant use with insulin and/or insulin secretagogues (eg, sulfonylureas): Reduced dose of insulin and/or insulin secretagogues may be needed.

Dosing: Geriatric

Refer to adult dosing. The initial and maintenance dosing should be conservative, due to the potential for decreased renal function (monitor).

Administration

Oral: Administer with food at the same time(s) each day. Extended-release tablet: Swallow whole; do not split, crush, dissolve, or chew.

Dietary Considerations

Individualized medical nutrition therapy (MNT) based on ADA recommendations is an integral part of therapy. Monitor for signs and symptoms of vitamin B12 and/or folic acid deficiency; supplementation may be required.

Storage

Store at 25°C (77°F); excursions permitted to 15°C to 30°C (59°F to 86°F). Protect from exposure to high humidity.

Drug Interactions

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

Bosentan: May decrease the serum concentration of CYP3A4 Substrates (High risk with Inducers). 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

CYP3A4 Inducers (Moderate): May decrease the serum concentration of CYP3A4 Substrates (High risk with Inducers). Monitor therapy

CYP3A4 Inducers (Strong): May decrease the serum concentration of LinaGLIPtin. Management: Strongly consider using an alternative to any strong CYP3A4 inducer in patients who are being treated with linagliptin. If this combination is used, monitor patients closely for evidence of reduced linagliptin effectiveness. Consider therapy modification

Dabrafenib: May decrease the serum concentration of CYP3A4 Substrates (High risk with Inducers). Management: Seek alternatives to the CYP3A4 substrate when possible. If concomitant therapy cannot be avoided, monitor clinical effects of the substrate closely (particularly therapeutic effects). Consider therapy modification

Dalfampridine: MetFORMIN may increase the serum concentration of Dalfampridine. Dalfampridine may increase the serum concentration of MetFORMIN. Monitor therapy

Deferasirox: May decrease the serum concentration of CYP3A4 Substrates (High risk with Inducers). Monitor therapy

Direct Acting Antiviral Agents (HCV): May enhance the hypoglycemic effect of Antidiabetic Agents. Monitor therapy

Dofetilide: MetFORMIN may increase the serum concentration of Dofetilide. Monitor therapy

Dolutegravir: May increase the serum concentration of MetFORMIN. Management: Consider the risks and benefits of this combination. If combined, limit the daily metformin dose to 1,000 mg when used with dolutegravir. Monitor for increased metformin effects/toxicities (including lactic acidosis) during concomitant use. Consider therapy modification

Enzalutamide: May decrease the serum concentration of CYP3A4 Substrates (High risk with Inducers). Management: Concurrent use of enzalutamide with CYP3A4 substrates that have a narrow therapeutic index should be avoided. Use of enzalutamide and any other CYP3A4 substrate should be performed with caution and close monitoring. Consider therapy modification

Erdafitinib: May decrease the serum concentration of CYP3A4 Substrates (High risk with Inducers). Monitor therapy

Erdafitinib: May increase the serum concentration of P-glycoprotein/ABCB1 Substrates. Monitor therapy

Erdafitinib: May increase the serum concentration of OCT2 Substrates. Monitor therapy

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: Dipeptidyl Peptidase-IV Inhibitors may enhance the hypoglycemic effect of Insulins. 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; Diatrizoate Sodium; Ethiodized Oil. Consider therapy modification

Isavuconazonium Sulfate: May increase the serum concentration of MetFORMIN. Monitor therapy

Ivosidenib: May decrease the serum concentration of CYP3A4 Substrates (High risk with Inducers). 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

Lasmiditan: May increase the serum concentration of P-glycoprotein/ABCB1 Substrates. Avoid combination

Lorlatinib: May decrease the serum concentration of CYP3A4 Substrates (High risk with Inducers). Management: Avoid concurrent use of lorlatinib with any CYP3A4 substrates for which a minimal decrease in serum concentrations of the CYP3A4 substrate could lead to therapeutic failure and serious clinical consequences. Consider therapy modification

Maitake: May enhance the hypoglycemic effect of Blood Glucose Lowering Agents. Monitor therapy

Mitotane: May decrease the serum concentration of CYP3A4 Substrates (High risk with Inducers). Management: Doses of CYP3A4 substrates may need to be adjusted substantially when used in patients being treated with mitotane. Consider therapy modification

Monoamine Oxidase Inhibitors: May enhance the hypoglycemic effect of Blood Glucose Lowering Agents. Monitor therapy

Nonsteroidal Anti-Inflammatory Agents: May enhance the adverse/toxic effect of MetFORMIN. 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

P-glycoprotein/ABCB1 Inducers: May decrease the serum concentration of LinaGLIPtin. Management: Strongly consider using an alternative to any strong P-glycoprotein inducer in patients who are being treated with linagliptin. If this combination is used, monitor patients closely for evidence of reduced linagliptin effectiveness. Consider therapy modification

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

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 1,700 mg per day when used together with ranolazine 1,000 mg twice daily. Monitor patients for metformin toxicities, including lactic acidosis and carefully weigh the risks and benefits of this combination. Consider therapy modification

Ritodrine: May diminish the therapeutic effect of Antidiabetic Agents. Monitor therapy

Ritonavir: May increase the serum concentration of LinaGLIPtin. Monitor therapy

Salicylates: May enhance the hypoglycemic effect of Blood Glucose Lowering Agents. Monitor therapy

Sarilumab: May decrease the serum concentration of CYP3A4 Substrates (High risk with Inducers). Monitor therapy

Selective Serotonin Reuptake Inhibitors: May enhance the hypoglycemic effect of Blood Glucose Lowering Agents. Monitor therapy

Siltuximab: May decrease the serum concentration of CYP3A4 Substrates (High risk with Inducers). Monitor therapy

Sulfonylureas: Dipeptidyl Peptidase-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

Tafenoquine: May increase the serum concentration of MATE1 Substrates. Management: Avoid use of MATE substrates with tafenoquine, and if the combination cannot be avoided, monitor closely for evidence of toxicity of the MATE substrate and consider a reduced dose of the MATE substrate according to that substrate's labeling. Consider therapy modification

Tafenoquine: May increase the serum concentration of OCT2 Substrates. Management: Avoid use of OCT2 substrates with tafenoquine, and if the combination cannot be avoided, monitor closely for evidence of toxicity of the OCT2 substrate and consider a reduced dose of the OCT2 substrate according to that substrate's labeling. Consider therapy modification

Thiazide and Thiazide-Like Diuretics: May diminish the therapeutic effect of Antidiabetic Agents. Monitor therapy

Tocilizumab: May decrease the serum concentration of CYP3A4 Substrates (High risk with Inducers). 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

Adverse Reactions

Reactions/percentages reported with combination product; also see individual agents. Frequency not always defined.

Dermatologic: Pruritus

Gastrointestinal: Diarrhea (6%), decreased appetite, nausea, pancreatitis, vomiting

Hypersensitivity: Hypersensitivity reaction

Respiratory: Nasopharyngitis (6%), cough

<1%, postmarketing, and/or case reports: Severe arthralgia (FDA Safety Alert, Aug 28, 2015)

Warnings/Precautions

Concerns related to adverse effects:

  • Arthralgia: Severe and disabling arthralgia has been reported with DPP-4 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-4 inhibitor therapy resumed. Discontinue use if severe joint pain results from DPP-4 inhibitor therapy.
  • 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.
  • Hypersensitivity reactions: Rare hypersensitivity reactions (including anaphylaxis, angioedema, and exfoliative skin conditions) have been reported in patients treated with linagliptin; discontinue if signs/symptoms of hypersensitivity reactions 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-4 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 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.
  • Pancreatitis: Cases of acute pancreatitis, including fatalities, have been reported with linagliptin. 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: 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 2019).

Disease-related concerns:

  • Bariatric surgery:

­ – Altered absorption: Use IR tablets after surgery. Absorption may be altered given the anatomic and transit changes created by gastric bypass and sleeve gastrectomy surgery. ER tablets may have a reduced effect after gastric bypass or sleeve gastrectomy due to the direct bypass of the stomach and proximal small bowel with gastric bypass or a more rapid gastric emptying and proximal small bowel transit with sleeve gastrectomy (Mechanick 2013; Melissas 2013). After gastric bypass (Roux-en-Y gastric bypass [RYGB]), administration of IR tablets led to increased absorption (AUC0-∞ increased by 21%) and bioavailability (increased by 50%) (Padwal 2011). Lactate levels decrease after gastric bypass (RYGB)-induced weight loss irrespective of the use of metformin. Routinely lowering metformin dose after gastric bypass is not necessary as long as normal renal function is preserved (Deden 2018). ­

– Glucagon-like peptide-1 exposure and therapeutic efficacy: Closely monitor for signs and symptoms of pancreatitis; gastric bypass and sleeve gastrectomy may increase endogenous secretion of glucagon-like peptide-1 (Korner 2009; Peterli 2012). A single-dose, placebo-controlled study evaluated short-term therapy (4 weeks) with sitagliptin in gastric bypass patients having persistent or recurrent type 2 diabetes and found it to be well tolerated and provided a small but significant reduction in postprandial blood glucose (Shah 2018).

  • Heart failure: Metformin may be used in patients with stable heart failure (HF); avoid use in unstable or hospitalized patients with heart failure (ADA 2019). 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). In cardiovascular outcome trials of patients with type 2 diabetes and atherosclerotic cardiovascular disease, treatment with other DPP-4 inhibitors has been associated with HF. However, in a randomized, double-blind placebo-controlled trial of patients with type 2 diabetes mellitus and high cardiovascular and renal risks, the occurrence of the primary composite cardiovascular outcome (cardiovascular death, nonfatal MI, nonfatal stroke) with linagliptin was found to be noninferior to placebo. In addition, the rate of hospitalization for HF did not differ from placebo, including in patients with preexisting HF. Median follow-up was 2.2 years (McGuire 2018; Rosenstock 2018).
  • 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). Risk of metformin accumulation and lactic acidosis increases with degree of renal impairment. Use is contraindicated in patients with eGFR <30 mL/minute/1.73 m2. Assess benefits/risks of metformin use in patients with eGFR 30 to 45 mL/minute/1.73 m2; if used, dosage reduction is recommended (ADA [Lipska 2011]; Inzucchi 2014). 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 (eg, 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.

Special populations:

  • Elderly: Use with caution; risk of metformin associated lactic acidosis increases with age.

Other warnings/precautions:

  • Appropriate use: Not for use in patients with diabetic ketoacidosis (DKA) or patients with type 1 diabetes mellitus.
  • 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 2019). Restart only after normal intake resumed and normal renal function is verified.

Monitoring Parameters

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 2019]); plasma glucose; hematologic parameters (eg, hemoglobin/hematocrit, red blood cell indices) annually; hepatic function, renal function (prior to initiation of therapy then at least annually or more frequently if necessary); vitamin B12 (periodically with long-term treatment) and folate (if megaloblastic anemia is suspected); signs/symptoms of pancreatitis; signs/symptoms of heart failure

Pregnancy

Pregnancy Considerations

Metformin crosses the placenta (ADA 2020). Refer to individual monographs for additional information.

Patient Education

What is this drug used for?

  • It is used to lower blood sugar in patients with high blood sugar (diabetes).

Frequently reported side effects of this drug

  • Abdominal pain
  • Nausea
  • Vomiting
  • Diarrhea
  • Passing gas
  • Loss of strength and energy
  • Headache
  • Sore throat
  • Stuffy nose
  • Runny nose

Other side effects of this drug: Talk with your doctor right away if you have any of these signs of:

  • Lactic acidosis like fast breathing, fast heartbeat, abnormal heartbeat, vomiting, fatigue, shortness of breath, severe loss of strength and energy, severe dizziness, feeling cold, or muscle pain or cramps.
  • Low blood sugar like dizziness, headache, fatigue, feeling weak, shaking, a fast heartbeat, confusion, hunger, or sweating.
  • Pancreas problem like pancreatitis; severe abdominal pain, severe back pain, severe nausea, vomiting.
  • Heart problems like cough or shortness of breath that is new or worse, swelling of the ankles or legs, abnormal heartbeat, weight gain of more than five pounds in 24 hours, dizziness, or passing out.
  • Eczema
  • Trouble swallowing
  • Skin blisters
  • Skin breakdown
  • Severe joint pain
  • Persistent joint pain
  • Tablet shell in stool
  • Signs of a significant reaction like 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. Talk to your doctor if you have questions.

Consumer Information Use and Disclaimer: This information should not be used to decide whether or not to take this medicine or any other medicine. Only the healthcare provider has the knowledge and training to decide which medicines are right for a specific patient. This information does not endorse any medicine as safe, effective, or approved for treating any patient or health condition. This is only a brief summary of general information about this medicine. It does NOT include all information about the possible uses, directions, warnings, precautions, interactions, adverse effects, or risks that may apply to this medicine. This information is not specific medical advice and does not replace information you receive from the healthcare provider. You must talk with the healthcare provider for complete information about the risks and benefits of using this medicine.

Source: Wolters Kluwer Health. Last updated January 28, 2020.