Table 4: Clinically Relevant Interactions with Dapagliflozin Tablets Insulin or Insulin Secretagogues Clinical Impact The risk of hypoglycemia may be increased when dapagliflozin tablets are used concomitantly with insulin or insulin secretagogues (e.g., sulfonylurea) [see Warnings and Precautions (5.4) ]. Intervention Concomitant use may require lower doses of insulin or the insulin secretagogue to reduce the risk of 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 dapagliflozin tablets 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. See full prescribing information for information on drug interactions and interference of dapagliflozin tablets with laboratory tests.
Drug Interactions In Vitro Assessment of Drug Interactions In in vitro studies, dapagliflozin and dapagliflozin 3-O-glucuronide neither inhibited CYP 1A2, 2C9, 2C19, 2D6, or 3A4, nor induced CYP 1A2, 2B6, or 3A4. Dapagliflozin is a weak substrate of the P-glycoprotein (P-gp) active transporter, and dapagliflozin 3-O-glucuronide is a substrate for the OAT3 active transporter. Dapagliflozin or dapagliflozin 3-O-glucuronide did not meaningfully inhibit P-gp, OCT2, OAT1, or OAT3 active transporters.
Overall, dapagliflozin is unlikely to affect the pharmacokinetics of concurrently administered medications that are P-gp, OCT2, OAT1, or OAT3 substrates. Effects of Other Drugs on Dapagliflozin Table 5 shows the effect of coadministered drugs on the pharmacokinetics of dapagliflozin in adults. No dose adjustments are recommended for dapagliflozin. Table 5: Effects of Coadministered Drugs on Dapagliflozin Systemic Exposure Coadministered Drug (Dose Regimen) Single dose unless otherwise noted.
Dapagliflozin (Dose Regimen) Effect on Dapagliflozin Exposure [% Change (90% CI)] C max AUC AUC = AUC(INF) for drugs given as single dose and AUC = AUC(TAU) for drugs given in multiple doses. No dosing adjustments required for the following: Oral Antidiabetic Agents Metformin (1000 mg) 20 mg ↔ ↔ Pioglitazone (45 mg) 50 mg ↔ ↔ Sitagliptin (100 mg) 20 mg ↔ ↔ Glimepiride (4 mg) 20 mg ↔ ↔ Voglibose (0.2 mg three times daily) 10 mg ↔ ↔ Other Medications Hydrochlorothiazide (25 mg) 50 mg ↔ ↔ Bumetanide (1 mg) 10 mg once daily for 7 days ↔ ↔ Valsartan (320 mg) 20 mg ↓12% [↓3%, ↓20%] ↔ Simvastatin (40 mg) 20 mg ↔ ↔ Anti-infective Agent Rifampin (600 mg once daily for 6 days) 10 mg ↓7% [↓22%, ↑11%] ↓22% [↓27%, ↓17%] Nonsteroidal Anti-inflammatory Agent Mefenamic Acid (loading dose of 500 mg followed by 14 doses of 250 mg every 6 hours) 10 mg ↑13% [↑3%, ↑24%] ↑51% [↑44%, ↑58%] ↔ = no change (geometric mean ratio of test: reference within 0.80 to 1.25); ↓ or ↑ = parameter was lower or higher, respectively, with coadministration compared to dapagliflozin administered alone (geometric mean ratio of test: reference was lower than 0.80 or higher than 1.25).
Effects of Dapagliflozin on Other Drugs Table 6 shows the effect of dapagliflozin on other coadministered drugs in adults. Dapagliflozin did not meaningfully affect the pharmacokinetics of the coadministered drugs. Table 6: Effects of Dapagliflozin on the Systemic Exposures of Coadministered Drugs Coadministered Drug (Dose Regimen) Single dose unless otherwise noted. Dapagliflozin (Dose Regimen) Effect on Coadministered Drug Exposure [% Change (90% CI)] C max AUC AUC = AUC(INF) for drugs given as single dose and AUC = AUC(TAU) for drugs given in multiple doses.
No dosing adjustments required for the following: Oral Antidiabetic Agents Metformin (1000 mg) 20 mg ↔ ↔ Pioglitazone (45 mg) 50 mg ↓7% [↓25%, ↑15%] ↔ Sitagliptin (100 mg) 20 mg ↔ ↔ Glimepiride (4 mg) 20 mg ↔ ↑13% [0%, ↑29%] Other Medications Hydrochlorothiazide (25 mg) 50 mg ↔ ↔ Bumetanide (1 mg) 10 mg once daily for 7 days ↑13% [↓2%, ↑31%] ↑13% [↓1%, ↑30%] Valsartan (320 mg) 20 mg ↓6% [↓24%, ↑16%] ↑5% [↓15%, ↑29%] Simvastatin (40 mg) 20 mg ↔ ↑19% Digoxin (0.25 mg) 20 mg loading dose then 10 mg once daily for 7 days ↔ ↔ Warfarin (25 mg) 20 mg loading dose then 10 mg once daily for 7 days ↔ ↔ ↔ = no change (geometric mean ratio of test: reference within 0.80 to 1.25); ↓ or ↑ = parameter was lower or higher, respectively, with coadministration compared to the other medicine administered alone (geometric mean ratio of test: reference was lower than 0.80 or higher than 1.25).
Pediatric use information is approved for AstraZeneca AB’s Farxiga ® (dapagliflozin) Tablets. However, due to AstraZeneca AB’s marketing exclusivity rights, this drug product is not labeled with that information.
