CLINICAL PHARMACOLOGY
Mechanism Of Action
Sodium-glucose cotransporter 2
(SGLT2), expressed in the proximal renal tubules, is responsible for the
majority of the reabsorption of filtered glucose from the tubular lumen.
Dapagliflozin is an inhibitor of SGLT2. By inhibiting SGLT2, dapagliflozin
reduces reabsorption of filtered glucose and lowers the renal threshold for
glucose, and thereby increases urinary glucose excretion.
Pharmacodynamics
General
Increases in the amount of
glucose excreted in the urine were observed in healthy subjects and in patients
with type 2 diabetes mellitus following the administration of dapagliflozin
(see Figure 1). Dapagliflozin doses of 5 or 10 mg per day in patients with type
2 diabetes mellitus for 12 weeks resulted in excretion of approximately 70
grams of glucose in the urine per day at Week 12. A near maximum glucose
excretion was observed at the dapagliflozin daily dose of 20 mg. This urinary
glucose excretion with dapagliflozin also results in increases in urinary
volume [see ADVERSE REACTIONS].
Figure 1: Scatter Plot and Fitted Line of Change from
Baseline in 24-Hour Urinary Glucose Amount versus Dapagliflozin Dose in Healthy
Subjects and Subjects with Type 2 Diabetes Mellitus (T2DM) (Semi-Log Plot)
Cardiac Electrophysiology
Dapagliflozin was not
associated with clinically meaningful prolongation of QTc interval at daily
doses up to 150 mg (15 times the recommended maximum dose) in a study of
healthy subjects. In addition, no clinically meaningful effect on QTc interval
was observed following single doses of up to 500 mg (50 times the recommended
maximum dose) of dapagliflozin in healthy subjects.
Pharmacokinetics
Absorption
Following oral administration
of dapagliflozin, the maximum plasma concentration (Cmax) is usually attained
within 2 hours under fasting state. The Cmax and AUC values increase dose
proportionally with increase in dapagliflozin dose in the therapeutic dose
range. The absolute oral bioavailability of dapagliflozin following the
administration of a 10 mg dose is 78%. Administration of dapagliflozin with a
high-fat meal decreases its Cmax by up to 50% and prolongs Tmax by
approximately 1 hour, but does not alter AUC as compared with the fasted state.
These changes are not considered to be clinically meaningful and dapagliflozin
can be administered with or without food.
Distribution
Dapagliflozin is approximately
91% protein bound. Protein binding is not altered in patients with renal or
hepatic impairment.
Metabolism
The metabolism of dapagliflozin is primarily mediated by
UGT1A9; CYP-mediated metabolism is a minor clearance pathway in humans.
Dapagliflozin is extensively metabolized, primarily to yield dapagliflozin
3-O-glucuronide, which is an inactive metabolite. Dapagliflozin 3-O-glucuronide
accounted for 61% of a 50 mg [14C]-dapagliflozin dose and is the predominant
drug-related component in human plasma.
Elimination
Dapagliflozin and related metabolites are primarily
eliminated via the renal pathway. Following a single 50 mg dose of [14C]-dapagliflozin,
75% and 21% total radioactivity is excreted in urine and feces, respectively.
In urine, less than 2% of the dose is excreted as parent drug. In feces,
approximately 15% of the dose is excreted as parent drug. The mean plasma
terminal half-life (t½) for dapagliflozin is approximately 12.9 hours following
a single oral dose of FARXIGA 10 mg.
Specific Populations
Renal Impairment
At steady state (20 mg once-daily dapagliflozin for 7
days), patients with type 2 diabetes with mild, moderate, or severe renal
impairment (as determined by eGFR) had geometric mean systemic exposures of
dapagliflozin that were 45%, 2.04-fold, and 3.03-fold higher, respectively, as
compared to patients with type 2 diabetes with normal renal function. Higher
systemic exposure of dapagliflozin in patients with type 2 diabetes mellitus
with renal impairment did not result in a correspondingly higher 24-hour
urinary glucose excretion. The steady-state 24-hour urinary glucose excretion
in patients with type 2 diabetes and mild, moderate, and severe renal
impairment was 42%, 80%, and 90% lower, respectively, than patients with type 2
diabetes with normal renal function. The impact of hemodialysis on
dapagliflozin exposure is not known [see DOSAGE AND ADMINISTRATION, WARNINGS
AND PRECAUTIONS, Use In Specific Populations, and Clinical
Studies].
Hepatic Impairment
In subjects with mild and moderate hepatic impairment
(Child-Pugh classes A and B), mean Cmax and AUC of dapagliflozin were up to 12%
and 36% higher, respectively, as compared to healthy matched control subjects
following single-dose administration of 10 mg dapagliflozin. These differences
were not considered to be clinically meaningful. In patients with severe
hepatic impairment (Child-Pugh class C), mean Cmax and AUC of dapagliflozin
were up to 40% and 67% higher, respectively, as compared to healthy matched
controls [see Use In Specific Populations].
Effects Of Age, Gender, Race, And Body Weight On Pharmacokinetics
Based on a population pharmacokinetic analysis, age,
gender, race, and body weight do not have a clinically meaningful effect on the
pharmacokinetics of dapagliflozin and thus, no dose adjustment is recommended.
Pediatric
Pharmacokinetics in the pediatric population has not been
studied.
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-OÂglucuronide 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 6 shows the effect of coadministered drugs on the
pharmacokinetics of dapagliflozin. No dose adjustments are recommended for
dapagliflozin.
Table 6: Effects of Coadministered Drugs on
Dapagliflozin Systemic Exposure
Coadministered Drug (Dose Regimen) * |
Dapagliflozin (Dose Regimen)* |
Effect on Dapagliflozin Exposure (% Change [90% CI]) |
Cmax |
AUC† |
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)
* Single dose unless otherwise noted.
† AUC = AUC(INF) for drugs given as single dose and AUC = AUC(TAU) for drugs
given in multiple doses. |
Effects Of Dapagliflozin On Other Drugs
Table 7 shows the effect of
dapagliflozin on other coadministered drugs. Dapagliflozin did not meaningfully
affect the pharmacokinetics of the coadministered drugs.
Table 7: Effects of
Dapagliflozin on the Systemic Exposures of Coadministered Drugs
Coadministered Drug (Dose Regimen)* |
Dapagliflozin (Dose Regimen)* |
Effect on Coadministered Drug Exposure (% Change [90% CI]) |
Cmax |
AUC† |
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).
* Single dose unless otherwise noted.
† AUC = AUC(INF) for drugs given as single dose and AUC = AUC(TAU) for drugs
given in multiple doses. |
Clinical Studies
Overview Of Clinical Studies Of FARXIGA For Type 2
Diabetes
FARXIGA has been studied as monotherapy, in combination
with metformin, pioglitazone, sulfonylurea (glimepiride), sitagliptin (with or
without metformin), metformin plus a sulfonylurea, or insulin (with or without
other oral antidiabetic therapy), compared to a sulfonylurea (glipizide), and
in combination with a GLP-1 receptor agonist (exenatide extended-release)
added-on to metformin. FARXIGA has also been studied in patients with type 2
diabetes and moderate renal impairment.
Treatment with FARXIGA as monotherapy and in combination
with metformin, glimepiride, pioglitazone, sitagliptin, or insulin produced
statistically significant improvements in mean change from baseline at Week 24
in HbA1c compared to control. Reductions in HbA1c were seen across subgroups
including gender, age, race, duration of disease, and baseline BMI.
Monotherapy
A total of 840 treatment-naive patients with inadequately
controlled type 2 diabetes participated in 2 placebo-controlled studies to
evaluate the safety and efficacy of monotherapy with FARXIGA.
In 1 monotherapy study, a total of 558 treatment-naive
patients with inadequately controlled diabetes participated in a 24Âweek study.
Following a 2-week diet and exercise placebo lead-in period, 485 patients with
HbA1c ≥ 7% and ≤ 10% were randomized to FARXIGA 5 mg or FARXIGA 10 mg
once daily in either the morning (QAM, main cohort) or evening (QPM), or
placebo.
At Week 24, treatment with FARXIGA 10 mg QAM provided
significant improvements in HbA1c and FPG compared with placebo (see Table 8).
Table 8: Results at Week 24 (LOCF*) in a
Placebo-Controlled Study of FARXIGA Monotherapy in Patients with Type 2
Diabetes (Main Cohort AM Doses)
Efficacy Parameter |
FARXIGA 10 mg
N=70† |
FARXIGA 5 mg
N=64† |
Placebo
N=75† |
HbA1c (%) |
Baseline (mean) |
8.0 |
7.8 |
7.8 |
Change from baseline (adjusted mean‡) |
-0.9 |
-0.8 |
-0.2 |
Difference from placebo (adjusted mean‡) (95% CI) |
−0.7§
(−1.0, −0.4) |
−0.5
(−0.8, −0.2) |
|
Percent of patients achieving HbA1c <7% adjusted for baseline |
50.8%¶ |
44.2%¶ |
31.6% |
FPG (mg/dL) |
Baseline (mean) |
166.6 |
157.2 |
159.9 |
Change from baseline (adjusted mean‡) |
-28.8 |
-24.1 |
-4.1 |
Difference from placebo (adjusted mean‡) (95% CI) |
−24.7§
(−35.7, −13.6) |
−19.9
(−31.3, −8.5) |
|
* LOCF: last observation (prior to rescue for rescued patients)
carried forward.
† All randomized patients who took at least one dose of double-blind study
medication during the short-term double-blind period.
‡ Least squares mean adjusted for baseline value. § p-value
<0.0001 versus placebo. Sensitivity analyses yielded smaller estimates of
treatment difference with placebo.
¶ Not evaluated for statistical significance as a result of the sequential
testing procedure for the secondary endpoints. |
Initial Combination Therapy With Metformin XR
A total of 1241 treatment-naive
patients with inadequately controlled type 2 diabetes (HbA1c ≥ 7.5% and
≤ 12%) participated in 2 active-controlled studies of 24-week duration to
evaluate initial therapy with FARXIGA 5 mg or 10 mg in combination with
metformin extended-release (XR) formulation.
In 1 study, 638 patients were
randomized to 1 of 3 treatment arms following a 1-week lead-in period: FARXIGA
10 mg plus metformin XR (up to 2000 mg per day), FARXIGA 10 mg plus placebo, or
metformin XR (up to 2000 mg per day) plus placebo. Metformin XR dose was
up-titrated weekly in 500 mg increments, as tolerated, with a median dose
achieved of 2000 mg.
The combination treatment of
FARXIGA 10 mg plus metformin XR provided statistically significant improvements
in HbA1c and FPG compared with either of the monotherapy treatments and
statistically significant reduction in body weight compared with
metformin XR alone (see Table 9 and Figure 2). FARXIGA 10 mg as monotherapy
also provided statistically significant improvements in FPG and statistically
significant reduction in body weight compared with metformin alone and was
noninferior to metformin XR monotherapy in lowering HbA1c.
Table 9: Results at Week 24 (LOCF*) in an
Active-Controlled Study of FARXIGA Initial Combination Therapy with Metformin
XR
Efficacy Parameter |
FARXIGA 10 mg + Metformin XR
N=211† |
FARXIGA 10 mg
N=219† |
Metformin XR
N=208† |
HbA1c (%) |
Baseline (mean) |
9.1 |
9.0 |
9.0 |
Change from baseline (adjusted mean‡) |
-2.0 |
-1.5 |
-1.4 |
Difference from FARXIGA (adjusted mean‡) (95% CI) |
−0.5§
(−0.7, −0.3) |
|
|
Difference from metformin XR (adjusted mean‡) (95% CI) |
−0.5§
(−0.8, −0.3) |
0.0¶
(−0.2, 0.2) |
|
Percent of patients achieving HbA1c <7% adjusted for baseline |
46.6%# |
31.7% |
35.2% |
FPG (mg/dL) |
Baseline (mean) |
189.6 |
197.5 |
189.9 |
Change from baseline (adjusted mean‡) |
-60.4 |
-46.4 |
-34.8 |
Difference from FARXIGA (adjusted mean‡) (95% CI) |
−13.9§ (−20.9, −7.0) |
|
|
Difference from metformin XR (adjusted mean‡) (95% CI) |
−25.5§
(−32.6, −18.5) |
−11.6#
(−18.6, −4.6) |
|
Body Weight (kg) |
Baseline (mean) |
88.6 |
88.5 |
87.2 |
Change from baseline (adjusted mean‡) |
-3.3 |
-2.7 |
-1.4 |
Difference from metformin XR (adjusted mean‡) (95% CI) |
−2.0§
(−2.6, −1.3) |
−1.4§
(−2.0, −0.7) |
|
* LOCF: last observation (prior to rescue for rescued
patients) carried forward.
† All randomized patients who took at least one dose of double-blind study
medication during the short-term double-blind period.
‡ Least squares mean adjusted for baseline value.
§ p-value <0.0001.
¶ Noninferior versus metformin XR.
# p-value <0.05 |
Figure 2: Adjusted Mean
Change from Baseline Over Time in HbA1c (%) in a 24-Week Active-Controlled
Study of FARXIGA Initial Combination Therapy with Metformin XR
In a second study, 603 patients
were randomized to 1 of 3 treatment arms following a 1-week lead-in period:
FARXIGA 5 mg plus metformin XR (up to 2000 mg per day), FARXIGA 5 mg plus
placebo, or metformin XR (up to 2000 mg per day) plus placebo. Metformin XR
dose was up-titrated weekly in 500 mg increments, as tolerated, with a median
dose achieved of 2000 mg.
The combination treatment of FARXIGA 5 mg plus metformin
XR provided statistically significant improvements in HbA1c and FPG compared
with either of the monotherapy treatments and statistically significant
reduction in body weight compared with metformin XR alone (see Table 10).
Table 10: Results at Week 24 (LOCF*) in an
Active-Controlled Study of FARXIGA Initial Combination Therapy with Metformin
XR
Efficacy Parameter |
FARXIGA 5 mg + Metformin XR
N=194† |
FARXIGA 5 mg
N=203† |
Metformin XR
N=201† |
HbA1c (%) |
Baseline (mean) |
9.2 |
9.1 |
9.1 |
Change from baseline (adjusted mean‡) |
-2.1 |
-1.2 |
-1.4 |
Difference from FARXIGA (adjusted mean‡) (95% CI) |
−0.9§
(−1.1, −0.6) |
|
|
Difference from metformin XR (adjusted mean‡) (95% CI) |
−0.7§
(−0.9, −0.5) |
|
|
Percent of patients achieving HbA1c <7% adjusted for baseline |
52.4%¶ |
22.5% |
34.6% |
FPG (mg/dL) |
Baseline (mean) |
193.4 |
190.8 |
196.7 |
Change from baseline (adjusted mean‡) |
-61.0 |
-42.0 |
-33.6 |
Difference from FARXIGA (adjusted mean‡) (95% CI) |
-19.1§
(-26.7, -11.4) |
|
|
Difference from metformin XR (adjusted mean‡) (95% CI) |
-27.5§
(-35.1, -19.8) |
|
|
Body Weight (kg) |
Baseline (mean) |
84.2 |
86.2 |
85.8 |
Change from baseline (adjusted mean‡) |
-2.7 |
-2.6 |
-1.3 |
Difference from metformin XR (adjusted mean‡) (95% CI) |
−1.4§
(−2.0, −0.7) |
|
|
* LOCF: last observation (prior to rescue for rescued
patients) carried forward.
† All randomized patients who took at least one dose of double-blind study
medication during the short-term double-blind period.
‡ Least squares mean adjusted for baseline value.
§ p-value <0.0001.
¶ p-value <0.05. |
Add-On To Metformin
A total of 546 patients with
type 2 diabetes with inadequate glycemic control (HbA1c ≥ 7% and
≤ 10%) participated in a 24-week, placebo-controlled study to evaluate
FARXIGA in combination with metformin. Patients on metformin at a dose of at
least 1500 mg per day were randomized after completing a 2-week, single-blind,
placebo lead-in period. Following the lead-in period, eligible patients were
randomized to FARXIGA 5 mg, FARXIGA 10 mg, or placebo in addition to their current
dose of metformin.
As add-on treatment to metformin, FARXIGA 10 mg provided
statistically significant improvements in HbA1c and FPG, and statistically
significant reduction in body weight compared with placebo at Week 24 (see
Table 11 and Figure 3). Statistically significant (p <0.05 for both doses)
mean changes from baseline in systolic blood pressure relative to placebo plus
metformin were -4.5 mmHg and -5.3 mmHg with FARXIGA 5 mg and 10 mg
plus metformin, respectively.
Table 11: Results of a 24-Week (LOCF*) Placebo-Controlled Study of
FARXIGA in Add-On Combination with Metformin
Efficacy Parameter |
FARXIGA 10 mg + Metformin
N=135† |
FARXIGA 5 mg + Metformin
N=137† |
Placebo + Metformin
N=137† |
HbA1c (%) |
Baseline (mean) |
7.9 |
8.2 |
8.1 |
Change from baseline (adjusted mean‡) |
-0.8 |
-0.7 |
-0.3 |
Difference from placebo (adjusted mean‡) (95% CI) |
−0.5§
(−0.7, −0.3) |
−0.4§
(−0.6, −0.2) |
|
Percent of patients achieving HbA1c <7% adjusted for baseline |
40.6%¶ |
37.5%¶ |
25.9% |
FPG (mg/dL) |
Baseline (mean) |
156.0 |
169.2 |
165.6 |
Change from baseline at Week 24 (adjusted mean‡) |
-23.5 |
-21.5 |
-6.0 |
Difference from placebo (adjusted mean‡) (95% CI) |
−17.5§
(−25.0, −10.0) |
−15.5§
(−22.9, −8.1) |
|
Change from baseline at Week 1 (adjusted mean‡) |
−16.5§
(N=115) |
−12.0§
(N=121) |
1.2
(N=126) |
Body Weight (kg) |
Baseline (mean) |
86.3 |
84.7 |
87.7 |
Change from baseline (adjusted mean‡) |
-2.9 |
-3.0 |
-0.9 |
Difference from placebo (adjusted mean‡) (95% CI) |
−2.0§
(−2.6, −1.3) |
−2.2§
(−2.8, −1.5) |
|
* LOCF: last observation (prior to rescue for rescued
patients) carried forward.
† All randomized patients who took at least one dose of double-blind study
medication during the short-term double-blind period.
‡ Least squares mean adjusted for baseline value.
§ p-value <0.0001 versus placebo + metformin.
¶ p-value <0.05 versus placebo + metformin. |
Figure 3: Adjusted Mean
Change from Baseline Over Time in HbA1c (%) in a 24-Week Placebo-Controlled
Study of FARXIGA in Combination with Metformin
Active Glipizide-Controlled
Study Add-On To Metformin
A total of 816 patients with
type 2 diabetes with inadequate glycemic control (HbA1c >6.5% and
≤ 10%) were randomized in a 52-week, glipizide-controlled, noninferiority
study to evaluate FARXIGA as add-on therapy to metformin. Patients on metformin
at a dose of at least 1500 mg per day were randomized following a 2-week
placebo lead-in period to glipizide or dapagliflozin (5 mg or 2.5 mg,
respectively) and were up-titrated over 18 weeks to optimal glycemic effect
(FPG <110 mg/dL, <6.1 mmol/L) or to the highest dose level (up to
glipizide 20 mg and FARXIGA 10 mg) as tolerated by patients. Thereafter, doses
were kept constant, except for down-titration to prevent hypoglycemia.
At the end of the titration
period, 87% of patients treated with FARXIGA had been titrated to the maximum
study dose (10 mg) versus 73% treated with glipizide (20 mg). FARXIGA led to a
similar mean reduction in HbA1c from baseline at Week 52 (LOCF), compared with glipizide,
thus demonstrating noninferiority (see Table 12). FARXIGA treatment led to a
statistically significant mean reduction in body weight from baseline at Week
52 (LOCF) compared with a mean increase in body weight in the glipizide group.
Statistically significant (p<0.0001) mean change from baseline in systolic
blood pressure relative to glipizide plus metformin was -5.0 mmHg with
FARXIGA plus metformin.
Table 12: Results at Week 52 (LOCF*) in an
Active-Controlled Study Comparing FARXIGA to Glipizide as Add-On to Metformin
Efficacy Parameter |
FARXIGA + Metformin
N=400† |
Glipizide + Metformin
N=401† |
HbA1c (%) |
Baseline (mean) |
7.7 |
7.7 |
Change from baseline (adjusted mean‡) |
-0.5 |
-0.5 |
Difference from glipizide + metformin (adjusted mean‡) (95% CI) |
0.0§
(-0.1, 0.1) |
|
Body Weight (kg) |
Baseline (mean) |
88.4 |
87.6 |
Change from baseline (adjusted mean‡) |
-3.2 |
1.4 |
Difference from glipizide + metformin (adjusted mean‡) (95% CI) |
−4.7¶
(−5.1, −4.2) |
|
* LOCF: last observation carried forward.
† Randomized and treated patients with baseline and
at least 1 postbaseline efficacy measurement.
‡ Least squares mean adjusted for baseline value.
§ Noninferior to glipizide + metformin.
¶ p-value <0.0001. |
Add-On Combination Therapy With Other Antidiabetic Agents
Add-On Combination Therapy With A Sulfonylurea
A total of 597 patients with type 2 diabetes and inadequate glycemic control (HbA1c ≥ 7% and
≤ 10%) were randomized in this 24-week, placebo-controlled study to
evaluate FARXIGA in combination with glimepiride (a sulfonylurea).
Patients on at least half the
maximum recommended dose of glimepiride as monotherapy (4 mg) for at least 8
weeks lead-in were randomized to FARXIGA 5 mg, FARXIGA 10 mg, or placebo in
addition to glimepiride 4 mg per day. Down-titration of glimepiride to 2 mg or
0 mg was allowed for hypoglycemia during the treatment period; no up-titration
of glimepiride was allowed.
In combination with glimepiride, FARXIGA 10 mg provided statistically significant improvement in
HbA1c, FPG, and 2Âhour PPG, and statistically significant reduction in body
weight compared with placebo plus glimepiride at Week 24 (see Table 13).
Statistically significant (p<0.05 for both doses) mean changes from baseline
in systolic blood pressure relative to placebo plus glimepiride were
-2.8 mmHg and -3.8 mmHg with FARXIGA 5 mg and 10 mg plus glimepiride,
respectively.
Add-On Combination Therapy With Metformin And A Sulfonylurea
A total of 218 patients with type 2 diabetes and
inadequate glycemic control (HbA1c ≥ 7% and ≤ 10.5%) participated in
a 24-week, placebo-controlled study to evaluate FARXIGA in combination with
metformin and a sulfonylurea. Patients on a stable dose of metformin
(immediate-or extended-release formulations) ≥ 1500 mg/day plus maximum
tolerated dose, which must be at least half the maximum dose, of a sulfonylurea
for at least 8 weeks prior to enrollment were randomized after an 8-week
placebo lead-in period to FARXIGA 10 mg or placebo. Dose-titration of FARXIGA
or metformin was not permitted during the 24–week treatment period.
Down-titration of the sulfonylurea was permitted to prevent hypoglycemia, but
no up-titration was permitted. As add-on treatment to combined metformin and a
sulfonylurea, treatment with FARXIGA 10 mg provided statistically significant
improvements in HbA1c and FPG and statistically significant reduction in body
weight compared with placebo at Week 24 (Table 13). A statistically significant
(p <0.05) mean change from baseline in systolic blood pressure relative to
placebo in combination with metformin and a sulfonyl urea was -3.8 mmHg with
FARXIGA 10 mg in combination with metformin and a sulfonylurea at Week 8.
Add-On Combination Therapy With A Thiazolidinedione
A total of 420 patients with type 2 diabetes with
inadequate glycemic control (HbA1c ≥ 7% and ≤ 10.5%) participated in
a 24-week, placebo-controlled study to evaluate FARXIGA in combination with
pioglitazone (a thiazolidinedione [TZD]) alone. Patients on a stable dose of
pioglitazone of 45 mg per day (or 30 mg per day, if 45 mg per day was not
tolerated) for 12 weeks were randomized after a 2-week lead-in period to 5 or
10 mg of FARXIGA or placebo in addition to their current dose of pioglitazone.
Dose titration of FARXIGA or pioglitazone was not permitted during the study.
In combination with pioglitazone, treatment with FARXIGA
10 mg provided statistically significant improvements in HbA1c, 2-hour PPG,
FPG, the proportion of patients achieving HbA1c <7%, and a statistically
significant reduction in body weight compared with the placebo plus
pioglitazone treatment groups (see Table 13) at Week 24. A statistically
significant (p <0.05) mean change from baseline in systolic blood pressure
relative to placebo in combination with pioglitazone was -4.5 mmHg with
FARXIGA 10 mg in combination with pioglitazone.
Add-On Combination Therapy With A DPP4 Inhibitor
A total of 452 patients with type 2 diabetes who were
drug naive, or who were treated at entry with metformin or a DPP4 inhibitor
alone or in combination, and had inadequate glycemic control (HbA1c ≥ 7.0%
and ≤ 10.0% at randomization), participated in a 24-week,
placebo-controlled study to evaluate FARXIGA in combination with sitagliptin (a
DPP4 inhibitor) with or without metformin.
Eligible patients were stratified based on the presence
or absence of background metformin (≥ 1500 mg per day), and within each
stratum were randomized to either FARXIGA 10 mg plus sitagliptin 100 mg once
daily, or placebo plus sitagliptin 100 mg once daily. Endpoints were tested for
FARXIGA 10 mg versus placebo for the total study group (sitagliptin with and
without metformin) and for each stratum (sitagliptin alone or sitagliptin with
metformin). Thirty-seven percent (37%) of patients were drug naive, 32% were on
metformin alone, 13% were on a DPP4 inhibitor alone, and 18% were on a DPP4
inhibitor plus metformin. Dose titration of FARXIGA, sitagliptin, or metformin
was not permitted during the study.
In combination with sitagliptin (with or without
metformin), FARXIGA 10 mg provided statistically significant improvements in
HbA1c, FPG, and a statistically significant reduction in body weight compared
with the placebo plus sitagliptin (with or without metformin) group at Week 24
(see Table 13). These improvements were also seen in the stratum of patients
who received FARXIGA 10 mg plus sitagliptin alone (placebo-corrected mean
change for HbA1c -0.56%; n=110) compared with placebo plus sitagliptin
alone (n=111), and the stratum of patients who received FARXIGA 10 mg plus
sitagliptin and metformin (placebo-corrected mean change for HbA1c -0.40;
n=113) compared with placebo plus sitagliptin with metformin (n=113).
Add-On Combination Therapy With Insulin
A total of 808 patients with type 2 diabetes who had
inadequate glycemic control (HbA1c ≥ 7.5% and ≤ 10.5%) were
randomized in a 24-week, placebo-controlled study to evaluate FARXIGA as add-on
therapy to insulin. Patients on a stable insulin regimen, with a mean dose of
at least 30 IU of injectable insulin per day, for a period of at least 8 weeks
prior to enrollment and on a maximum of 2 oral antidiabetic medications (OADs),
including metformin, were randomized after completing a 2-week enrollment
period to receive either FARXIGA 5 mg, FARXIGA 10 mg, or placebo in addition to
their current dose of insulin and other OADs, if applicable. Patients were
stratified according to the presence or absence of background OADs. Up-or
down-titration of insulin was only permitted during the treatment phase in
patients who failed to meet specific glycemic goals. Dose modifications of
blinded study medication or OAD(s) were not allowed during the treatment phase,
with the exception of decreasing OAD(s) where there were concerns over
hypoglycemia after cessation of insulin therapy.
In this study, 50% of patients were on insulin
monotherapy at baseline, while 50% were on 1 or 2 OADs in addition to insulin.
At Week 24, FARXIGA 10 mg dose provided statistically significant improvement
in HbA1c and reduction in mean insulin dose, and a statistically significant
reduction in body weight compared with placebo in combination with insulin,
with or without up to 2 OADs (see Table 13); the effect of FARXIGA on HbA1c was
similar in patients treated with insulin alone and patients treated with
insulin plus OAD. Statistically significant (p<0.05) mean change from
baseline in systolic blood pressure relative to placebo in combination with
insulin was -3.0 mmHg with FARXIGA 10 mg in combination with insulin.
At Week 24, FARXIGA 5 mg (-5.7 IU, difference from
placebo) and 10 mg (-6.2 IU, difference from placebo) once daily resulted
in a statistically significant reduction in mean daily insulin dose
(p<0.0001 for both doses) compared to placebo in combination with insulin,
and a statistically significantly higher proportion of patients on FARXIGA 10
mg (19.6%) reduced their insulin dose by at least 10% compared to placebo
(11.0%).
Table 13: Results of 24-Week (LOCF*)
Placebo-Controlled Studies of FARXIGA in Combination with Antidiabetic Agents
Efficacy Parameter |
FARXIGA 10 mg |
FARXIGA 5 mg |
Placebo |
In Combination with Sulfonylurea (Glimepiride) |
Intent-to-Treat Population |
N=151† |
N=142† |
N=145† |
HbA1c (%) |
Baseline (mean) |
8.1 |
8.1 |
8.2 |
Change from baseline (adjusted mean‡) |
-0.8 |
-0.6 |
-0.1 |
Difference from placebo (adjusted mean‡) (95% CI) |
−0.7¶
(−0.9, −0.5) |
−0.5¶
(−0.7, −0.3) |
|
Percent of patients achieving HbA1c <7% adjusted for baseline |
31.7%¶ |
30.3%¶ |
13.0% |
FPG (mg/dL) |
Baseline (mean) |
172.4 |
174.5 |
172.7 |
Change from baseline (adjusted mean‡) |
-28.5 |
-21.2 |
-2.0 |
Difference from placebo (adjusted mean‡) (95% CI) |
−26.5¶
(−33.5, −19.5) |
−19.3¶
(−26.3, −12.2) |
|
2-hour PPG# (mg/dL) |
Baseline (mean) |
329.6 |
322.8 |
324.1 |
Change from baseline (adjusted mean‡) |
-60.6 |
-54.5 |
-11.5 |
Difference from placebo (adjusted mean‡) (95% CI) |
−49.1¶
(−64.1, −34.1) |
−43.0¶
(–58.4, −27.5) |
|
Body Weight (kg) |
Baseline (mean) |
80.6 |
81.0 |
80.9 |
Change from baseline (adjusted mean‡) |
-2.3 |
-1.6 |
-0.7 |
Difference from placebo (adjusted mean‡) (95% CI) |
-1.5¶
(-2.2, -0.9) |
-0.8¶
(-1.5, -0.2) |
|
In Combination with Metformin and a Sulfonylurea |
Intent-to-Treat Population |
N=108† |
- |
N=108† |
HbA1c (%) |
Baseline (mean) |
8.08 |
- |
8.24 |
Change from baseline (adjusted mean‡§) |
-0.86 |
- |
-0.17 |
Difference from placebo (adjusted mean‡§) (95% CI) |
−0.69¶ (−0.89, −0.49) |
- |
|
Percent of patients achieving HbA1c <7% adjusted for baseline |
31.8%¶ |
- |
11.1% |
FPG (mg/dL) |
Baseline (mean) |
167.4 |
- |
180.3 |
Change from baseline (adjusted mean‡) |
-34.2 |
- |
-0.8 |
Difference from placebo (adjusted mean‡) (95% CI) |
−33.5¶
(−43.1, −23.8) |
- |
|
Body Weight (kg) |
Baseline (mean) |
88.57 |
- |
90.07 |
Change from baseline (adjusted mean‡) |
-2.65 |
- |
-0.58 |
Difference from placebo (adjusted mean‡) (95% CI) |
−2.07¶
(−2.79, −1.35) |
- |
|
In Combination with Thiazolidinedione (Pioglitazone) |
Intent-to-Treat Population |
N=140Þ |
N=141Þ |
N=139Þ |
HbA1c (%) |
Baseline (mean) |
8.4 |
8.4 |
8.3 |
Change from baseline (adjusted mean‡) |
-1.0 |
-0.8 |
-0.4 |
Difference from placebo (adjusted mean‡) (95% CI) |
−0.6¶
(−0.8, −0.3) |
−0.4¶
(−0.6, −0.2) |
|
Percent of patients achieving HbA1c <7% adjusted for baseline |
38.8%β |
32.5%β |
22.4% |
FPG (mg/dL) |
Baseline (mean) |
164.9 |
168.3 |
160.7 |
Change from baseline (adjusted mean‡) |
-29.6 |
-24.9 |
-5.5 |
Difference from placebo (adjusted mean‡) (95% CI) |
−24.1¶
(−32.2, −16.1) |
−19.5¶
(−27.5, −11.4) |
|
2-hour PPG# (mg/dL) |
Baseline (mean) |
308.0 |
284.8 |
293.6 |
Change from baseline (adjusted mean‡) |
-67.5 |
-65.1 |
-14.1 |
Difference from placebo (adjusted mean‡) (95% CI) |
−53.3¶
(−71.1, −35.6) |
−51.0¶
(−68.7, −33.2) |
|
Body Weight (kg) |
Baseline (mean) |
84.8 |
87.8 |
86.4 |
Change from baseline (adjusted mean‡) |
-0.1 |
0.1 |
1.6 |
Difference from placebo (adjusted mean‡) (95% CI) |
−1.8¶
(−2.6, −1.0) |
−1.6¶
(−2.3, −0.8) |
|
In Combination with DPP4 Inhibitor (Sitagliptin) with or without Metformin |
Intent-to-Treat Population |
N=223† |
- |
N=224† |
HbA1c (%) |
Baseline (mean) |
7.90 |
- |
7.97 |
Change from baseline (adjusted mean‡) |
-0.45 |
- |
0.04 |
Difference from placebo (adjusted mean‡) (95% CI) |
−0.48¶
(−0.62, −0.34) |
— |
|
Patients with HbA1c decrease >0.7% (adjusted percent) |
35.4% |
- |
16.6% |
FPG (mg/dL) |
Baseline (mean) |
161.7 |
- |
163.1 |
Change from baseline at Week 24 (adjusted mean‡) |
-24.1 |
- |
3.8 |
Difference from placebo (adjusted mean‡) (95% CI) |
−27.9¶
(−34.5, −21.4) |
- |
|
Body Weight (kg) |
Baseline (mean) |
91.02 |
- |
89.23 |
Change from baseline (adjusted mean‡) |
-2.14 |
- |
-0.26 |
Difference from placebo (adjusted mean‡) (95% CI) |
−1.89¶
(−2.37, −1.40) |
- |
|
In Combination with Insulin with or without up to 2 Oral Antidiabetic Therapies |
Intent-to-Treat Population |
N=194† |
N=211† |
N=193† |
HbA1c (%) |
Baseline (mean) |
8.6 |
8.6 |
8.5 |
Change from baseline (adjusted mean‡) |
-0.9 |
-0.8 |
-0.3 |
Difference from placebo (adjusted mean‡) (95% CI) |
−0.6¶
(−0.7, −0.5) |
−0.5¶
(−0.7, −0.4) |
|
FPG (mg/dL) |
Baseline (mean) |
173.7 |
NTÀ |
170.0 |
Change from baseline (adjusted mean‡) |
-21.7 |
NTÀ |
3.3 |
Difference from placebo (adjusted mean‡) (95% CI) |
−25.0¶
(−34.3, −15.8) |
NTÀ |
|
Body Weight (kg) |
Baseline (mean) |
94.6 |
93.2 |
94.2 |
Change from baseline (adjusted mean‡) |
-1.7 |
-1.0 |
0.0 |
Difference from placebo (adjusted mean‡) (95% CI) |
−1.7¶
(−2.2, −1.2) |
−1.0¶
(−1.5, −0.5) |
|
* LOCF: last observation (prior to rescue for rescued
patients) carried forward.
† Randomized and treated patients with baseline and at least 1 post baseline
efficacy measurement.
‡ Least squares mean adjusted for baseline value
based on an ANCOVA model.
§ Least squares mean adjusted for baseline value based on a longitudinal
repeated easures model.
¶ p-value <0.0001 versus placebo.
# 2-hour PPG level as a response to a 75-gram oral glucose tolerance test
(OGTT).
à All randomized patients who took at least one dose of double-blind study
medication during the short-term, double-blind period.
à p-value <0.05 versus placebo.
à NT: Not formally tested because of failing to achieve a statistically significant
difference in an endpoint that was earlier in the testing sequence. |
Combination Therapy With Exenatide-Extended
Release As Add-On To Metformin
A total of 694 adult patients
with type 2 diabetes and inadequate glycemic control (HbA1c ≥ 8.0 and ≤ 12.0%)
on metformin, were evaluated in a 28-week double-blind, active-controlled study
to compare FARXIGA in combination with exenatide extended-release (a GLP-1
receptor agonist) to FARXIGA alone and exenatide extended-release alone, as
add-on to metformin (NCT02229396). Patients on metformin at a dose of at least
1,500 mg per day were randomized following a 1-week placebo lead-in period to
receive either FARXIGA 10 mg once daily (QD) in combination with exenatide
extended-release 2 mg once weekly (QW), FARXIGA 10 mg QD, or exenatide
extended–release 2 mg QW. Â
At week 28, FARXIGA in
combination with exenatide extended-release provided statistically
significantly greater reductions in HbA1c (-1.77%) compared to FARXIGA alone
(-1.32%, p=0.001) and exenatide extended-release alone (-1.42%, p=0.012).
FARXIGA in combination with exenatide extended-release provided statistically
significantly greater reductions in FPG (-57.35 mg/dL) compared to FARXIGA
alone (-44.72 mg/dL, p=0.006) and exenatide extended-release alone (-40.53, p
<0.001).
Use In Patients With Type 2 Diabetes And Renal Impairment
The efficacy of FARXIGA was assessed in a study of
diabetic patients with moderate renal impairment (252 patients with mean eGFR
45 mL/min/1.73 m²). FARXIGA did not show efficacy in this study. The
placebo-corrected mean HbA1c change at 24 weeks was -0.1% (95% CI
[-0.4%, 0.2%]) for both FARXIGA 5 mg (n=83) and 10 mg (n=82).