Farxiga Drug Interactions: What to Avoid and What to Tell Your Doctor

Farxiga (dapagliflozin) has a relatively clean drug interaction profile compared to many other medications — but there are important interactions that can increase your risk of serious side effects. Understanding these before you start Farxiga (or any new medication) is key to staying safe.

Always Tell Your Doctor and Pharmacist About ALL Your Medications

Before starting Farxiga, give your healthcare provider a complete list of everything you take — including prescription drugs, over-the-counter medications, vitamins, and herbal supplements. Even products that seem unrelated can interact with Farxiga.

Interaction #1: Insulin and Insulin Secretagogues (Moderate — Monitor Closely)

Farxiga enhances the glucose-lowering effect of insulin and sulfonylureas (such as glipizide, glimepiride, and glyburide). When these are combined, blood sugar can drop too low — causing hypoglycemia.

What to do: Your doctor will likely reduce your insulin or sulfonylurea dose when adding Farxiga. Monitor your blood sugar more frequently when starting Farxiga, and always carry a fast-acting glucose source (glucose tablets, juice, etc.) in case of hypoglycemia.

Affected medications include:

Insulin (all types: glargine, detemir, NPH, aspart, lispro, regular)

Glipizide (Glucotrol), glimepiride (Amaryl), glyburide (DiaBeta)

Other insulin secretagogues (repaglinide, nateglinide)

Interaction #2: Diuretics (Moderate — Increased Dehydration Risk)

Farxiga itself has diuretic-like effects (it promotes urinary excretion of water and sodium). When combined with loop diuretics (furosemide, bumetanide, torsemide) or thiazide diuretics (hydrochlorothiazide, chlorthalidone), the combined effect can cause excessive dehydration, low blood pressure, and electrolyte imbalances — and potentially acute kidney injury.

What to do: Stay well hydrated, especially in hot weather or during illness. Your doctor may monitor kidney function and electrolytes more frequently when Farxiga is combined with diuretics. Report dizziness, lightheadedness on standing, or decreased urination promptly.

Interaction #3: NSAIDs and Ibuprofen (Moderate — Kidney Risk)

NSAIDs (non-steroidal anti-inflammatory drugs) like ibuprofen (Advil, Motrin), naproxen (Aleve), and celecoxib (Celebrex) reduce blood flow to the kidneys and can impair kidney function. Combined with Farxiga's effects on kidney filtration and fluid balance, there's an increased risk of acute kidney injury.

What to do: Avoid prolonged or high-dose NSAID use while taking Farxiga. For occasional pain relief, acetaminophen (Tylenol) is generally safer for people on Farxiga. Discuss NSAID use with your doctor before taking them regularly.

Interaction #4: UGT Inducers (Moderate — Reduced Farxiga Levels)

Certain drugs that induce enzymes responsible for metabolizing dapagliflozin (specifically UGT1A9) can reduce the effectiveness of Farxiga by increasing its metabolism and lowering drug levels in the body. The main offender is rifampin (rifampicin), an antibiotic used for tuberculosis. If your doctor prescribes rifampin, discuss whether your Farxiga dose needs adjustment.

Interaction #5: Alcohol (Moderate — Ketoacidosis Risk)

Heavy or chronic alcohol consumption increases the risk of diabetic ketoacidosis (DKA) when taking Farxiga. Alcohol impairs glucose metabolism and can deplete glycogen stores, both of which contribute to ketone buildup. Occasional moderate alcohol consumption is generally not prohibited, but discuss your drinking habits with your doctor when starting Farxiga.

Interaction #6: ACE Inhibitors and ARBs (Minor — Monitor)

ACE inhibitors (lisinopril, ramipril, enalapril) and ARBs (losartan, valsartan, irbesartan) are often prescribed alongside Farxiga for patients with CKD or heart failure. This combination is generally safe and beneficial — both classes protect the kidneys and heart. However, the combination can sometimes cause blood pressure to drop too low. Monitor your blood pressure, especially when first combining these medications.

Interaction #7: Other Diabetes Medications (Minor — Monitor)

GLP-1 receptor agonists (Ozempic/semaglutide, Trulicity/dulaglutide, Victoza/liraglutide), DPP-4 inhibitors (Januvia/sitagliptin), and metformin all have additive blood sugar-lowering effects when combined with Farxiga. These combinations are commonly used and generally well tolerated, but require close monitoring of blood glucose levels — especially when initiating or stopping any one of them.

Important Interaction Alert: Stop Farxiga Before Surgery

This is not a drug-drug interaction per se, but it's critical to know: hold Farxiga for at least 3 days before any major surgery or medical procedure involving prolonged fasting. This prevents the risk of perioperative euglycemic diabetic ketoacidosis — a serious complication where blood sugar seems normal but dangerous ketones build up. Tell every member of your surgical and anesthesia team that you take Farxiga.

What to Tell Every Provider You See

Make sure every provider knows you take Farxiga, including:

Your primary care doctor, all specialists, dentist, and urgent care

Hospital staff and your surgical and anesthesia team before any procedure

Your pharmacist every time you pick up a new medication (they can screen for interactions)

For a full review of Farxiga's side effect profile, including serious warnings, read our guide on Farxiga side effects: what to expect and when to call your doctor. If you need help finding Farxiga at a pharmacy near you, medfinder.com can help.