Side effects of avandia

by lori
(Houston, tx)

Avandia Side Effects

Avandia Side Effects




QUESTION: I gained about 20 pounds while taking Avandia and was worried about my heart. I was changed to Actos, gained more weight, lost 32 pounds after stopping it, and then gained 26 pounds within three months after restarting. My body aches, and I have difficulty beginning to walk after sitting. Could Avandia or Actos be causing this?





Urgent Quick Answer


Yes, both Avandia and Actos can cause weight gain and fluid retention, and they can cause or worsen heart failure. Gaining 26 pounds in three months after restarting Actos requires prompt medical assessment, especially if you have ankle or leg swelling, shortness of breath, difficulty breathing when lying flat, unusual fatigue, or a rapidly enlarging abdomen. Do not simply continue or stop the medicine without contacting the prescriber and arranging a safe alternative glucose plan.




Answer by Dr. Albana Greca, MD, MMedSc



Hi Lori,



Your concerns are medically reasonable. Avandia contains rosiglitazone, while Actos contains pioglitazone. Both belong to the thiazolidinedione, or TZD, group. They improve insulin sensitivity but can also make the body retain salt and water.



Is the Weight Gain Fluid or Body Fat?



It may be a combination of both. TZD-related weight gain can result from fluid retention and increased body fat. A fast increase accompanied by swelling or breathlessness is particularly concerning for excess fluid and possible heart failure.



Your weight loss after stopping Actos and regain after restarting it strengthen the possibility that the medicine is contributing, but they do not prove that every pound is fluid. A clinician should examine you, compare weights, check for edema, and assess the heart, lungs, kidneys, liver, and thyroid.



What Are the Heart Risks?



Both medicines carry strong warnings about congestive heart failure. They are not appropriate for people with severe heart failure and should generally be avoided when symptomatic heart failure is present. Risk can be higher when a TZD is combined with insulin.



Rosiglitazone labeling also warns about a possible increased heart-attack risk. The safest decision depends on your heart history, symptoms, blood pressure, kidney function, and other medicines. Read more in our guide to diabetes medicine safety and side effects.



Could Actos Explain the Body Aches?



Muscle pain has been reported with pioglitazone, but generalized aching and difficulty walking are not specific enough to blame on one medicine. Other possibilities include edema, arthritis, a muscle or tendon disorder, neuropathy, a fracture, thyroid disease, vitamin deficiency, or another medicine such as a statin.



Pioglitazone and rosiglitazone can increase fracture risk, particularly in women. New focal bone pain, inability to bear weight, or pain after a minor injury deserves prompt examination. Do not try to exercise through severe or worsening pain.



Other Important Side Effects




  • Edema and heart failure: swelling, rapid weight gain, breathlessness, or unusual fatigue.

  • Eye problems: macular edema may cause blurred or reduced vision.

  • Liver injury: persistent nausea, abdominal pain, loss of appetite, dark urine, jaundice, or unexplained fatigue.

  • Bone fractures: especially in women taking these medicines long term.

  • Pioglitazone and bladder concerns: it should not be used with active bladder cancer; blood in urine, urinary urgency, or painful urination needs evaluation.



What Should Your Clinician Check?




  • Current weight compared with the weight before Actos

  • Leg, ankle, abdominal, heart, and lung examination

  • Kidney and liver tests, electrolytes, HbA1c, and thyroid testing when appropriate

  • All medicines, including insulin, blood-pressure drugs, pain relievers, and statins

  • Whether a different glucose-lowering treatment would provide better weight, heart, or kidney outcomes



Current diabetes treatment offers several alternatives. Selection should consider HbA1c, heart and kidney health, weight goals, low-glucose risk, side effects, cost, and insurance coverage. Our overview of diabetes medicine options explains the main groups.



Do Not Stop Without a Replacement Plan



Stopping Actos may allow glucose to rise, as you experienced. That does not mean you must accept rapid weight gain or possible fluid retention. Contact the prescriber promptly and request a medication review and a written transition plan rather than repeatedly stopping and restarting the drug yourself.



Record your morning weight, glucose, swelling, breathing symptoms, and medicine doses. A sudden increase of several pounds over a few days should be reported urgently.




Important Safety Note


Seek emergency care for severe or worsening shortness of breath, chest pressure or pain, fainting, blue lips, confusion, coughing pink or frothy fluid, or inability to breathe comfortably while lying down. Seek same-day medical advice for rapid weight gain, new leg or abdominal swelling, unusual fatigue, or reduced exercise tolerance while taking Avandia or Actos.





Doctor’s Note


A 26-pound gain within three months of restarting pioglitazone should not be dismissed. It may include both fluid and fat and warrants prompt evaluation for edema and heart failure. The body aches and walking difficulty also need a separate musculoskeletal and medication review. Ask for an alternative diabetes plan rather than tolerating severe adverse effects or stopping treatment without replacement.





Educational safety note: This answer is for general diabetes education only. It does not replace personal medical advice, diagnosis, or treatment. Do not start, stop, restart, or change Avandia, Actos, insulin, tablets, pain medicines, or supplements without speaking with your healthcare provider.




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Last reviewed: July 2026.




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