Forxiga Side Effects Guide 2025: Common, Serious & Long-Term Effects

Complete guide to Forxiga (dapagliflozin) side effects: UTIs, yeast infections, ketoacidosis, hypoglycemia, dizziness, and long-term effects. Learn when to seek medical help.

Medically reviewed by Dr. Roshan Basnet, MBBS, MD (Internal Medicine) on 2026-09-05. See the medical review policy.

Forxiga (dapagliflozin) is an SGLT2 inhibitor used for diabetes, heart failure, and kidney disease. Like all medicines, it has side effects — some mild, some serious, and some that require immediate attention.

Common Side Effects of Forxiga

These happen in 1–10% of users. Most improve over time, but here’s what to watch for and how to manage them.

✔ Increased urination

Very common due to glucose being expelled in urine. This effect may diminish after the first few weeks. To avoid dehydration, drink water steadily throughout the day — but check with your doctor if you have heart failure, as fluid limits may apply.

✔ UTIs (Urinary Tract Infections)

Symptoms:

• Burning sensation
• Frequent urge
• Cloudy urine

Reason: sugar in urine promotes bacterial growth. Manage it: urinate promptly when you feel the urge, wipe front to back, and stay well hydrated. Contact your doctor at the first sign of a UTI — early treatment prevents complications.

✔ Genital yeast infections

More common in women but also occurs in men. Yeast thrives on sugar in urine.

Symptoms:

• Itching
• Redness
• White discharge

Reduce your risk: wear loose, breathable underwear; avoid harsh soaps; and keep the area clean and dry. Over-the-counter antifungal creams may help, but always consult your doctor before starting any treatment.

✔ Thirst & dehydration

Due to fluid loss from increased urination. Most people can manage by drinking water when thirsty. If you feel unusually thirsty or have dark urine, increase your fluid intake gradually. Seek medical advice if symptoms persist — especially if you are on diuretics or have kidney problems.

✔ Dizziness or light-headedness

Caused by low blood pressure or dehydration. To avoid falls, stand up slowly from sitting or lying down. If dizziness occurs frequently or you feel faint, tell your doctor — your dose may need adjustment.

Serious Side Effects (Seek Medical Help Immediately)

🔥 A. Diabetic Ketoacidosis (DKA)

This is the most dangerous side effect. DKA can occur even if your blood sugar is normal (euglycemic DKA), especially if you are ill, fasting, or have had surgery.

RED FLAG — go to the ER immediately if you have:

• Nausea, vomiting
• Deep rapid breathing
• Abdominal pain
• Fruity breath odour
• Extreme tiredness

Do not wait for blood sugar to rise — DKA with Forxiga can happen at normal glucose levels. Stop Forxiga and get emergency care.

🔥 B. Severe UTIs (Pyelonephritis or Urosepsis)

RED FLAG symptoms — seek help right away:

• High fever
• Pain in back/flanks
• Vomiting
• Confusion

Infection can spread to the kidneys or blood. Early treatment with antibiotics is essential.

🔥 C. Fournier's Gangrene (Very Rare)

A severe, life-threatening infection of the genital area that requires immediate surgery.

RED FLAG symptoms — go to the ER:

• Swelling
• Severe pain
• Fever
• Redness spreading rapidly
• Foul odour

Do not delay — this condition worsens quickly.

Long-Term Side Effects

Positive long-term effects

• Better heart function — Forxiga reduces hospitalisation risk in heart failure. Read more in our Heart Failure Treatment Guide.
• Slower kidney decline — especially beneficial for people with diabetic kidney disease. See our Kidney Disease Management Guide.
• Reduced risk of hospitalisation
• Mild weight loss
• Better long-term glucose control — for type 2 diabetes, Forxiga complements lifestyle changes. Visit our Diabetes Self-Management Guide.

Negative long-term effects (rare)

• Repeated UTIs
• Recurrent yeast infections
• Chronic dehydration
• Electrolyte changes — your doctor may check your sodium and potassium levels periodically
• Possible bone density reduction (not confirmed, but monitor if you have osteoporosis risk)

Tips to Reduce Side Effects

• ✔ Drink enough water — aim for small, consistent sips throughout the day
• ✔ Maintain good genital hygiene — keep area dry, avoid douching
• ✔ Avoid excessive alcohol — it increases dehydration and DKA risk
• ✔ Monitor for UTI symptoms early — report burning or urgency to your doctor
• ✔ Take the medicine consistently every day at the same time
• ✔ If dizzy → stand up slowly, hold on to a stable surface
• ✔ Check blood sugar if using insulin — Forxiga may lower your insulin needs
• ✔ Have a plan for sick days — ask your doctor when to temporarily stop Forxiga during illness (e.g., vomiting, diarrhoea)

When to Stop Forxiga Immediately

Stop and seek urgent help if you notice any of these RED FLAG signs:

• Severe abdominal pain
• Deep/rapid breathing
• High fever
• Painful swollen genitals
• Severe rash or blistering skin
• Sudden drop in urination
• Persistent vomiting
• Confusion

Do not restart Forxiga unless your doctor has evaluated the cause.

This content is for educational purposes only and does not replace professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any medication.

How to take Forxiga

Take Forxiga once a day, at the same time each day. You can take it with or without food. Swallow the tablet whole. You will usually need to take it long term. Do not stop taking it suddenly. If you stop, your blood sugar may go up. Talk to your doctor first if you want to stop. If you get sick with vomiting, diarrhea, or a fever, you are at risk for dehydration. Talk to a pharmacist or doctor for advice. If you take Forxiga with insulin or other medicines that help your body make insulin, your doctor may need to lower the dose of those medicines. This helps prevent low blood sugar.

What to do if you miss a dose or take too much

If you miss a dose, take it as soon as you remember. But if it is less than 12 hours until your next dose, skip the missed dose. Take your next dose at the usual time. Do not take two doses at the same time. Taking an extra dose is unlikely to cause problems, but it can sometimes be dangerous. If you take too much, speak to a pharmacist as soon as possible. If you cannot reach a pharmacist, call NHS 111 for advice. If you are told to go to the emergency room, do not drive. Ask someone to drive you or call 999 for an ambulance. Bring the medicine packet with you.

Other serious side effects to watch for

Forxiga can cause serious side effects that are rare. Call a doctor or get help right away if you have any of these symptoms. An allergic reaction can cause a swollen throat or tongue, a raised itchy rash, or trouble breathing. A severe urinary tract infection (UTI) can cause a high temperature, shivering, or a burning feeling when you pee. Fournier’s gangrene is a very serious infection that affects the vagina or penis. Symptoms include severe pain, swelling, redness, and blisters. Low blood sugar (hypoglycaemia) can make you feel dizzy or faint. If you feel sleepy or dizzy after taking Forxiga, do not drive, ride a bike, or use machinery until you feel better. Talk to your doctor if low blood sugar happens often.

For related medicine and condition background, see Dapagliflozin, Insulin and Empagliflozin.

This article is for informational purposes only and does not replace professional medical advice. Consult your healthcare provider before making medical decisions.

Educational information only. Always consult a qualified healthcare professional for medical advice.