What Are They For?
Originally developed for type 2 diabetes, SGLT2 inhibitors are now one of the "four pillars" of HFrEF (heart with weak contraction) treatment and are also proven to help in HFpEF (heart with stiff, preserved contraction) — one of the more significant recent advances in heart failure care, benefiting the heart independent of their effect on blood sugar.
How They Help (In Plain Terms)
These medications work in the kidney, causing you to excrete some excess sugar — and a modest amount of fluid — in your urine. Beyond the blood-sugar effect, they have direct, favorable effects on heart function and fluid balance that benefit heart failure patients regardless of whether they have diabetes.
Common Examples
- Empagliflozin (Jardiance)
- Dapagliflozin (Farxiga)
- Canagliflozin (Invokana)
- Ertugliflozin (Steglatro)
Common Side Effects to Know
- Increased urination — expected, related to how the medication works
- Genital yeast infections — more common with this drug class; good hygiene helps
- A rare but serious risk of a specific diabetic complication in diabetic patients — discuss your specific risk with your doctor
- Dehydration risk if combined with other fluid losses (illness, hot weather) without adjusting fluid intake
Practical Tips
- Stay adequately hydrated, especially in hot weather or if you're ill
- Tell your care team before any planned surgery, since these medications are often paused temporarily around procedures
- Report signs of a genital infection promptly — it's easily treated, but worth addressing
What Your Care Team Monitors
Kidney function, blood sugar if you have diabetes, and your overall fluid status.
Common Questions
I don't have diabetes — why am I on a diabetes medication?
Because this class has proven heart failure benefit independent of diabetes status — it's being used here specifically for your heart, not your blood sugar.
Will this make me urinate constantly?
There's often an initial increase that typically eases somewhat over time, though it's expected to continue to some degree.
Can I get dehydrated on this?
It's possible, especially with vomiting, diarrhea, or very hot weather — discuss a sick-day plan with your care team.
Does it matter which one I'm on?
For heart failure benefit specifically, empagliflozin and dapagliflozin have the most direct trial evidence, but your care team's choice also factors in your insurance coverage, whether you have diabetes, and kidney function — ask if you're curious why you were prescribed your specific one.