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Overview of Ertugliflozin

  1. Vivianne K. Nguyen and
  2. John R. White Jr
  1. College of Pharmacy and Pharmaceutical Sciences, Washington State University, Spokane, WA
  1. Corresponding author: John R. White, Jr., whitej{at}wsu.edu
Clinical Diabetes 2019 Apr; 37(2): 176-178. https://doi.org/10.2337/cd18-0097
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Introduction

Despite the availability of 12 different classes of medications, many people with type 2 diabetes struggle to maintain glycemic control (1). Among the many new antidiabetic medications to have emerged in recent years, sodium–glucose cotransporter 2 (SGLT2) inhibitors have proved to be a particularly effective oral treatment for these patients (2). Since the approval of the first drug in this class, canagliflozin, by the U.S. Food and Drug Administration (FDA) in March 2013, a total of four SGLT2 agents have become available (both as single and fixed-dose combination formulas) (1). In 2017, an estimated 1.7 million patients received a dispensed prescription for an SGLT2 inhibitor from U.S. outpatient retail pharmacies (2). Ertugliflozin is the newest agent among these, having received FDA approval in December 2017 (3).

Indications

Ertugliflozin is indicated as an adjunct to diet and exercise for control of hyperglycemia in adults (≥18 years of age) with type 2 diabetes (4). It can be used as monotherapy in patients for whom metformin is contraindicated or not well tolerated. It can also be used in combination with other antidiabetic agents (most commonly metformin or a dipeptidyl peptidase 4 [DPP-4] inhibitor) to help reduce A1C. Currently, ertugliflozin is available as an oral tablet sold under the brand name Steglatro or in oral tablet combinations with the DPP-4 sitagliptin (brand name Stegujan) or with metformin (brand name Segluromet). Ertugliflozin is not approved for the treatment of type 1 diabetes, renal impairment, or ketoacidosis.

Mechanism of Action

As other SGLT2 inhibitors, ertugliflozin works by blocking glucose transport from the glomerular filtrate across the apical membrane of the proximal epithelial cells, resulting in increased urinary glucose excretion and reduced filtered glucose renal reabsorption. Ertugliflozin is predominantly metabolized by the enzymes UGT1A9 and UGT2B, with minor contributions by CYP3A4, and even less by CYP3A5 and CYP2C8 (4). Ertugliflozin does not inhibit CYP450 isoenzymes (CYPs) 1A2, 2C9, 2C19, 2C8, 2B6, 2D6, or 3A4 and does not induce CYPs 1A2, 2B6, or 3A4 (4). This might be beneficial in patients with type 2 diabetes who have complications and are on multiple medications because taking ertugliflozin would reduce the chance of having major interactions with drugs that are metabolized by these common enzymes (2).

Potential Advantages

Ertugliflozin has been shown to lower A1C in adults with type 2 diabetes. It has been studied extensively in multiple clinical trial settings and has been found to be effective in all of them (5). Three multicenter, randomized, double-blind, placebo- and active comparator–controlled clinical studies evaluating ertugliflozin have demonstrated its efficacy in further lowering A1C when used in combination with sitagliptin in 1,985 people with type 2 diabetes from different ethnic groups (6). Another phase 3 trial in 4,800 people with type 2 diabetes and moderate renal failure compared the use of ertugliflozin as monotherapy and in combination with metformin or sitagliptin, as well as insulin and a sulfonylurea. Results confirmed significantly lower A1C in those who took ertugliflozin alone or in combination with sitagliptin (6).

Ertugliflozin therapy may also be beneficial for patients who are overweight or hypertensive. Due to its mechanism of action, ertugliflozin induces more excretion of sodium through osmotic diuresis, which then leads to a mild reduction in blood pressure. Excretion of glucose in the urine also helps with weight loss due to loss of calories (7). Another study of ertugliflozin has shown it to be associated with a mean reduction in body weight of 6.6 lb with the 5-mg dose compared to 2.2 lb with placebo (7). More data are being collected to compare these benefits to those of other SGLT2 inhibitors.

Potential Disadvantages

Clinical trials have demonstrated that the safety profile of ertugliflozin is similar to other compounds in its class (i.e., association with genital mycotic infection, lower-limb amputation, urinary tract infection, acute kidney injury hypotension, and ketoacidosis) (5). Because this drug has been approved recently, data used to evaluate its associated risks with regard to these adverse effects are still being collected and will be updated in the near future (5). However, one could expect to see a range of adverse effects with ertugliflozin similar to those of other SGLT2 inhibitors.

A recent safety announcement from the FDA (1) has raised concern regarding the risk of Fournier’s gangrene, a rare but life-threatening bacterial infection of the genial areas, in patients taking an SGLT2 inhibitor. Twelve cases have been identified since 2013 in both male and female patients who were being treated with an SGLT2 inhibitor (1). Ertugliflozin has included this information in its package insert, and patients being treated with this medication will be monitored closely in its post-marketing surveillance.

Cost

The out-of-pocket price of ertugliflozin monotherapy tablets is $321.99 per 30-tablet bottle for 1 month of use based on recommended dosing (6). Currently, Merck has a copayment assistance program that will help cover some of patients’ out-of-pocket cost if private insurance is used to fill a prescription for ertugliflozin or its combination formulations with sitagliptin or metformin.

Commentary

Given its risk/benefit profile, ertugliflozin is considered a favorable drug of choice within the SGLT2 inhibitor class of medications. It does not contain a black box warning, as does canagliflozin for its risk of lower-limb amputation in people with type 2 diabetes and established cardiovascular disease (CVD) (8). However, prescribers must still consider carefully before starting this therapy in elderly patients with renal impairment and CVD, those with recurrent infections and high risk of limb amputation, and female patients with recurrent urinary tract infections.

Patient education is key before starting this therapy. The FDA released a safety announcement in August 2018 to advise patients treated with SGLT2 inhibitors to seek medical attention immediately if they experience symptoms of redness, swelling, or tenderness of the genital areas accompanied by a fever (8).

Bottom Line

Ertugliflozin seems to be a reasonable second- or third-line therapeutic option adjuvant to diet and exercise for people with type 2 diabetes who have not achieved their glycemic goals. Patients’ medical history, costs, and risk/benefit factors are key issues that should be thoroughly considered before starting patients on ertugliflozin therapy.

Acknowledgments

Duality of Interest

J.R.W. serves on an advisory board for Sanofi. No other potential conflicts of interest relevant to this article were reported.

Author Contributions

Both authors contributed to and were involved in the research, writing, and editing of this article. J.R.W. is the guarantor of this work and, as such, had full access to all of the references cited and takes responsibility for the accuracy of the content.

  • © 2018 by the American Diabetes Association.

Readers may use this article as long as the work is properly cited, the use is educational and not for profit, and the work is not altered. See http://creativecommons.org/licenses/by-nc-nd/3.0 for details.

References

  1. 1.↵
    1. U.S. Food and Drug Administration
    . Drug safety and availability: FDA warns about rare occurrences of a serious infection of the genital area with SGLT2 inhibitors for diabetes. Available from www.fda.gov/Drugs/DrugSafety/ucm617360.htm. Accessed 5 October 2018
  2. 2.↵
    1. U.S. Food and Drug Administration
    . Steglatro (ertugliflozin), Steglujan (ertugliflozin and sitagliptin), Segluromet (ertugliflozin and metformin hydrochloride) tablets. Available from www.accessdata.fda.gov/drugsatfda_docs/nda/2017/209803,209805,209806Orig1s000TOC.cfm. Accessed 5 October 2018
  3. 3.↵
    1. Pfizer. FDA
    approves SGLT2 inhibitor STEGLATRO™ (ertugliflozin) and fixed-dose combination STEGLUJAN™ (ertugliflozin and sitagliptin) for adults with type 2 diabetes. Available from www.pfizer.com/news/press-release/press-release-detail/fda_approves_sglt2_inhibitor_steglatro_ertugliflozin_and_fixed_dose_combination_steglujan_ertugliflozin_and_sitagliptin_for_adults_with_type_2_diabetes. Accessed 5 October 2018
  4. 4.↵
    1. U.S. Food and Drug Administration
    . Medication guide: Steglujan (STEG-loo-jan) (ertugliflozin and sitagliptin) tablets, for oral use. Available from www.accessdata.fda.gov/drugsatfda_docs/label/2018/209805s001lbl.pdf#page=32. Accessed 5 April 2018
  5. 5.↵
    1. Merck, Sharp & Dohme
    . Steglatro (ertugliflozin) official website. Available from www.steglatro.com. Accessed 5 October 2018
  6. 6.↵
    1. U.S. Food and Drug Administration
    . Englund E. Center for Drug Evaluation and Research application number 209803. Available from www.accessdata.fda.gov/drugsatfda_docs/nda/2017/209803,209805,209806Orig1s000SumR.pdf. Accessed 25 April 2018
  7. 7.↵
    1. Clements JM
    . New SGLT-2 inhibitor: ertugliflozin (Steglatro) [blog post]. Available from www.diabeteseducator.org/news/aade-blog/aade-blog-details/jennifer-n.-clements-pharmd-bcps-cde-bcacp/2018/05/01/new-sglt-2-inhibitor-ertugliflozin. Accessed 5 October 2018
  8. 8.↵
    1. Micromedex Canagliflozin (Invokana)
    . Available from www.micromedexsolutions.com/micromedex2/librarian/CS/0ECE1D/ND_PR/evidencexpert/ND_P/evidencexpert/DUPLICATIONSHIELDSYNC/F4ADC7/ND_PG/evidencexpert/ND_B/evidencexpert/ND_AppProduct/evidencexpert/ND_T/evidencexpert/PFActionId/evidencexpert.GoToDashboard?docId=930464&contentSetId=100&title=Canagliflozin&servicesTitle=Canagliflozin&brandName=Invokana#. Accessed 5 October 2018
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Overview of Ertugliflozin
Vivianne K. Nguyen, John R. White
Clinical Diabetes Apr 2019, 37 (2) 176-178; DOI: 10.2337/cd18-0097

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Overview of Ertugliflozin
Vivianne K. Nguyen, John R. White
Clinical Diabetes Apr 2019, 37 (2) 176-178; DOI: 10.2337/cd18-0097
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