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Antidiabetic / thiazolidinedione (glitazone)

Pioglitazone: uses, side effects & precautions

Also known as Actos, Glustin, Competact (with metformin).

Diese Informationen dienen ausschließlich der allgemeinen Orientierung und stellen keine medizinische Beratung dar. Konsultieren Sie bei persönlichen gesundheitlichen Anliegen stets eine qualifizierte medizinische Fachkraft. Wählen Sie im Notfall Ihre örtliche Notrufnummer.

What it is used for

  • Type 2 diabetes (to improve the body's response to insulin, usually alongside other medicines)

How it works

Pioglitazone makes the body's tissues more sensitive to insulin, helping cells take up glucose more effectively and lowering blood sugar over time. It does not usually cause low blood sugar on its own.

How it is taken

Available as tablets taken by mouth, usually once a day with or without food, and in combination with metformin. Take it exactly as your doctor, pharmacist, or the label directs.

No doses here on purpose. The right strength and schedule depend on you — only a doctor or pharmacist should set them. Always follow your prescription and the label.

Common side effects

  • Weight gain
  • Fluid retention and swelling (ankles/legs)
  • Mild upper respiratory symptoms
  • Headache
  • Slightly increased risk of bone fractures over time

Serious effects — get help

  • Signs of heart failure or worsening fluid overload — rapid weight gain, severe swelling, breathlessness; seek urgent care
  • Blood in the urine, urgent or painful urination, or back pain (possible bladder concern) — see your doctor promptly
  • Signs of liver problems (yellow skin/eyes, dark urine, persistent nausea)

If a reaction is severe — for example trouble breathing, swelling of the face or throat, or collapse — go to the nearest emergency room now or call your local emergency number. Do not wait for an online consultation.

Interactions to watch

  • Insulin (raises the risk of fluid retention and heart failure)
  • Other diabetes medicines (low-blood-sugar risk when combined)
  • Some medicines that affect liver enzymes may change its effect
  • Check all medicines with your pharmacist

Who should take care

  • Avoided in people with heart failure or a history of it
  • Tell your doctor about any bladder cancer history or unexplained urinary symptoms
  • Use with caution if you have liver problems; liver checks may be advised
  • Not recommended in pregnancy or breastfeeding unless a doctor advises
  • Report swelling, breathlessness, or sudden weight gain promptly

Frequently asked questions

Why might I retain fluid on pioglitazone?
It can cause the body to hold onto fluid, leading to swelling and weight gain. This is more risky if you have heart problems — report severe swelling or breathlessness.
Does it cause low blood sugar?
On its own it rarely does, because it improves insulin sensitivity rather than forcing insulin release. Combining it with other diabetes drugs can change that.
Is there a cancer concern?
Some studies raised questions about bladder cancer risk. Tell your doctor about any blood in the urine or urinary symptoms, and any history of bladder cancer.
How long until it works?
It can take several weeks to see the full effect on blood sugar, as it works gradually. Keep taking it as prescribed unless your doctor advises otherwise.
Is Pioglitazone safe to take?
For most people it is safe when taken exactly as a doctor or pharmacist advises and as printed on the label. Tell your clinician about your other medicines and health conditions, and seek urgent care for any serious reaction.

Related conditions

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