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Key takeaways
Farxiga is a prescription medication commonly prescribed to treat Type 2 diabetes and slow the progression of heart failure and kidney disease.
Understanding how Farxiga works is key to managing its effects.
Farxiga and caffeine both increase urine output, which can lead to dehydration and fluctuations in blood sugar or blood pressure.
Staying well-hydrated is the most effective strategy to mitigate potential side effects.
For many Americans, coffee is a daily ritual. So when you’re prescribed a new medication, one of the first questions that comes to mind is whether your morning cup is still okay. If you’re taking Farxiga, you may be wondering how caffeine fits into the picture.
Farxiga (dapagliflozin) is commonly prescribed to treat Type 2 diabetes and is also FDA approved to help slow the progression of heart failure and chronic kidney disease. While caffeine doesn’t directly interact with the medication, both can affect hydration, blood sugar, and blood pressure. For most people, moderate caffeine intake is safe, but some may need to cut back or take extra precautions. Here’s what to know before you brew your next cup.
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How caffeine might interact with Farxiga
“Farxiga does not directly interact with caffeine,” says Talia Wall, Pharm.D., an assistant professor of pharmacy practice at Touro College of Pharmacy in New York, New York. “But Farxiga and caffeine may have similar effects on the body. They both contribute to increased urine output.” So, taking them together may increase the risk of changes in blood sugar, low blood pressure, or dehydration. These are the three biggest ways that mixing caffeine and Farxiga may contribute to negative side effects.
1. Blood sugar fluctuations
“Farxiga [a sodium-glucose cotransporter-2 (SGLT2) inhibitor] already works to decrease blood glucose on its own by pushing excess glucose out of the body through the urinary tract,” explains Carrie Kreps, Pharm.D., the director of clinical services at Pharmacy Care Associates, an independent specialty retail pharmacy in Montgomery, Alabama. She says that strictly mixing caffeine with Farxiga does not have a direct impact on blood sugar for everyone, but it could cause fluctuations depending on a few factors.
“In someone with diabetes who is taking insulin, caffeine can potentially increase insulin resistance or impair the way that the body responds to insulin, creating an opposite effect than desired by Farxiga use,” Dr. Wall says. “At the same time, caffeine may enhance the ability of Farxiga to remove glucose from the body via the urine as it has a similar effect on the body, and this would contribute to lower blood sugar levels.” In other words, if you’re taking Farxiga for Type 2 diabetes and struggling to get your blood sugar under control, combining it with caffeine could make that a little more difficult.
Dr. Kreps adds that if you typically get your caffeine from a sugary coffee or energy drink, the added carbohydrates in your drink could affect your blood sugar.
2. Blood pressure tug-of-war
“It’s reasonable to expect blood pressure to slightly drop when taking Farxiga alone because of how it works [by increasing urine output],” Dr. Kreps says. But when you drink coffee, you may experience some fluctuations. “Adding caffeine consumption while taking Farxiga may offset the decrease in blood pressure initially, because caffeine can initially increase blood pressure,” Dr. Kreps explains. “And then after, it causes mild diuresis, which could possibly decrease blood pressure in sensitive demographics.”
3. Hydration changes
Since Farxiga and caffeine both increase how much you go to the bathroom, they can increase the likelihood of dehydration. But as long as you’re taking steps to drink enough water, it shouldn’t be an issue. “Mixing Farxiga and caffeine may cause dehydration, but caffeine doesn’t necessarily need to be avoided if a patient maintains adequate fluid intake,” Dr. Wall says.
What the research says
There are not many scientific studies examining the effects of combining Farxiga and caffeine, but the few that exist have reached the same conclusions. When treatment with Farxiga is started, it can cause a slight worsening in kidney function. Even so, for the long term, Farxiga helps slow the decline in kidney function after what is called the initial “dip”. Two studies from Saint Louis University, one published in the Journal of the American Society of Nephrology and the other published in Physiological Reports showed that caffeine in large quantities may help offset the “dip” in kidney function that is seen when patients are started on Farxiga.
However, these were both retrospective survey-style studies that relied on people self-reporting their caffeine intake, both of which are limitations that would need to be addressed in future research into how caffeine may impact the effects of Farxiga on kidney function.
When to be extra cautious
“For a patient taking Farxiga, consuming caffeine in moderation is generally safe,” Dr. Wall says. However, there are a few groups of people who should be extra cautious. They include:
- People with existing kidney problems
- People with chronic low blood pressure
- Older adults
“These groups may benefit from consuming caffeine in stricter moderation since if they do experience dehydration or low blood pressure, it could worsen injury to the kidney,” Dr. Wall explains. Before you take Farxiga, always share any preexisting health conditions and a list of all over-the-counter supplements and medications you are taking with your provider. Farxiga has drug interactions with several medications, such as lithium, diuretics, blood pressure medications, certain diabetes medications like insulin, and sulfonylureas such as glimepiride.
Practical advice for caffeine consumers on Farxiga
Whenever you’re starting a new medication, it’s important to seek medical advice from a healthcare professional to determine if you need to make any changes to your typical habits. As for caffeine and Farxiga, Dr. Wall and Dr. Kreps say that staying well-hydrated is the most important factor in avoiding potential side effects. You can do so by following these tips:
- Drink plenty of water throughout the day.
- Focus on drinking more caffeine-free beverages than caffeinated beverages ones
- Eat hydrating fruits and vegetables, such as cucumbers, tomatoes, and melons.
- Avoid drinking alcohol, which can also contribute to dehydration.
- Be mindful of other ways our bodies lose hydration, such as perspiration. Be especially careful of your hydration status while exercising or being active outdoors,” says Dr. Kreps.
If you’re unsure if you’re dehydrated, try this simple test. “Your own hydration status can be a little bit hard to gauge, but I often encourage people to pay attention to how they feel if they stand up quickly from a seated position. If they become lightheaded, they likely need to hydrate,” Dr. Kreps says.
The bottom line
Farxiga and caffeine don’t directly interact, but they can have overlapping effects on the body. Because both increase urine output, pairing them may raise the risk of dehydration and contribute to swings in blood sugar or blood pressure, particularly for people taking Farxiga to manage those conditions.
For this reason, “it would be wise to keep caffeine consumption to a reasonable amount while taking Farxiga,” Dr. Kreps says. Stay mindful of how you feel, prioritize hydration, and keep your healthcare provider informed so they can monitor your response, adjust your dosage if needed, and help you avoid unnecessary side effects.
- Caffeine effects on eGFR dip in patients who started SGLT2 inhibitors, Journal of the American Society of Nephrology (2023)
- Association between caffeine and the eGFR dip after initiation of SGLT2 inhibitors in adult patients, Physiological Reports (2025)