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Megestrol Acetate

Megestrol Acetate

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What is Megestrol Acetate?

Megestrol acetate has been approved by the US FDA for treating certain cancers of the breast or uterus. Doctors have also used megestrol acetate to treat prostate and ovarian cancer. This drug has also been used to stimulate appetite and increase body weight in people with AIDS or cancer.

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What is Megestrol Acetate ?

Megestrol acetate has been approved by the US FDA for treating certain cancers of the breast or uterus. Doctors have also used megestrol acetate to treat prostate and ovarian cancer. This drug has also been used to stimulate appetite and increase body weight in people with AIDS or cancer.

  • Sudden or severe headache, problems with vision, speech, or walking
  • Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing
  • Blurred vision, severe headache, slow or fast heartbeat, lightheadedness, dizziness
  • Changes in skin color, dark freckles, cold feeling, weakness, tiredness, weight loss
  • Chest pain, trouble breathing, coughing up blood
  • Dry mouth, fruit-like breath odor, nausea, vomiting, stomach pain
  • Increased thirst, change in how much or how often you urinate
  • Numbness or weakness in your arm or leg, or on one side of your body, pain in your lower leg
  • Rapid weight gain, swelling in your hands, ankles, or feet
  • Unusual bleeding, bruising, or weakness.
  • Swelling in your hands, ankles, or feet.
  • Rapid weight gain.
  • Sudden or severe headache, problems with vision, speech, or walking.
  • This medicine may cause the following problems:Adrenal gland problemsDiabetes
  • Your doctor will do lab tests at regular visits to check on the effects of this medicine. Keep all appointments.
  • Keep all medicine out of the reach of children. Never share your medicine with anyone.
  • It is not safe to take this medicine during pregnancy. It could harm an unborn baby. Tell your doctor right away if you become pregnant. If you are a woman who can get pregnant, your doctor may do tests to make sure you are not pregnant before starting this medicine.
  • Do not breastfeed. You can spread HIV or AIDS to your baby through your breast milk.
  • Tell your doctor if you are breastfeeding, or if you have kidney disease, liver disease, adrenal gland problems (including Cushing syndrome), cancer, diabetes, an infection, mental problems, stomach or bowel problems, or a history of blood clots.
  • Unusual bleeding, bruising, or weakness.
What is megestrol acetate used for?

It depends on the dosage form. The 20 mg and 40 mg tablets are FDA-approved for the palliative treatment of advanced carcinoma of the breast or endometrium in recurrent, inoperable, or metastatic disease, and they are not a substitute for surgery, radiation, or chemotherapy. The 40 mg/mL oral suspension and the concentrated 125 mg/mL suspension (Megace ES) are FDA-approved to treat anorexia, cachexia, or unexplained significant weight loss in patients with a diagnosis of AIDS. Your prescriber chooses the form that matches the condition being treated.

What are the common side effects of megestrol acetate?

The label's rate table comes from the oral suspension at 800 mg/day in the AIDS anorexia and cachexia trials, so it does not describe the tablets dose for dose. In those trials, adverse events reported in at least 5% of patients on 800 mg/day were diarrhea, impotence, rash, flatulence, hypertension, asthenia, insomnia, nausea, anemia, fever, and decreased libido. Weight gain is also a frequent effect and is considered a therapeutic effect rather than fluid retention alone. More serious risks described on the label include adrenal insufficiency with long-term use, blood clots such as deep vein thrombosis and pulmonary embolism, high blood sugar or new diabetes, and heart failure and swelling. Contact your care team about any symptom that concerns you.

Why should older adults avoid megestrol for weight gain?

The Beers Criteria, a widely used list of medicines to use cautiously in older people, recommends avoiding megestrol in adults 65 and older for appetite or weight. The reasoning is that it produces minimal effect on weight while increasing the risk of blood clots and possibly death. Megestrol is also prescribed off-label as an appetite stimulant, including in long-term care, which is not an FDA-approved use; the only approved appetite indication is for anorexia, cachexia, or unexplained significant weight loss in patients diagnosed with AIDS. If megestrol has been suggested for an older adult's appetite or weight, that is a good conversation to have with the prescriber.

What is the difference between megestrol tablets and megestrol oral suspension?

They are approved for different things. The tablets (20 mg and 40 mg) are approved for palliative treatment of advanced breast or endometrial cancer. The oral suspension (40 mg/mL) and the concentrated suspension (125 mg/mL, sold as Megace ES) are approved for anorexia, cachexia, or unexplained significant weight loss in patients diagnosed with AIDS. The two suspension concentrations are not interchangeable with each other either, so fill exactly what was prescribed and check the concentration on the bottle.

Can you stop taking megestrol suddenly?

Not on your own. The label warns against stopping abruptly after long-term use, because chronic megestrol can suppress the body's stress-hormone axis and stopping suddenly can unmask adrenal insufficiency. Symptoms can include low blood pressure, nausea, vomiting, dizziness, or weakness, and failure to recognize this may result in death. Extra steroid coverage may be needed during periods of stress such as illness or surgery. Talk to your prescriber before making any change to how you take it.

How much does Megestrol Acetate 40MG cost without insurance?
The price of Megestrol Acetate 40MG without insurance varies by pharmacy, dosage, and quantity. Rx.com compares cash prices at more than 60,000 US pharmacies so you can find the lowest price near you. Many people save 60–90% off retail prices with a free Rx.com coupon.
What are the common side effects of Megestrol Acetate 40MG?
Common side effects of Megestrol Acetate 40MG may include: Sudden or severe headache, problems with vision, speech, or walking, Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing, Blurred vision, severe headache, slow or fast heartbeat, lightheadedness, dizziness, Changes in skin color, dark freckles, cold feeling, weakness, tiredness, weight loss, Chest pain, trouble breathing, coughing up blood. This is not a complete list — consult your pharmacist or doctor for full side effect information.
Is there a generic version of Megestrol Acetate 40MG?
Generic versions may be available for Megestrol Acetate 40MG. Generics contain the same active ingredients as brand-name drugs and are typically 80–90% cheaper. Search Megestrol Acetate 40MG on Rx.com to compare generic and brand prices at pharmacies near you.
What is the cheapest pharmacy for Megestrol Acetate 40MG?
The cheapest pharmacy for Megestrol Acetate 40MG depends on your location and dosage. Rx.com compares prices at CVS, Walgreens, Walmart, Kroger, Costco, and thousands of independent pharmacies. Enter your ZIP code on Rx.com to find the lowest price for Megestrol Acetate 40MG near you.

Megestrol Acetate Coupons & Prices

Megestrol Acetate

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Megestrol Acetate Bottle — prescription drug image
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Use a free Rx.com megestrol acetate coupon to compare cash prices at more than 60,000 pharmacies near you before you fill. Megestrol acetate is a progestin available as a generic in tablet form and as an oral suspension, and what you pay without insurance can differ a lot from one pharmacy to the next, even within the same town. Because it is dispensed as a generic, comparing cash prices is the practical way to find your best option. Enter your ZIP code above to see today's price at pharmacies around you.

What is megestrol acetate and how does it work?

Megestrol acetate is a progestin, a synthetic version of the hormone progesterone. It is classified both as a hormonal antineoplastic agent and as an appetite stimulant. Megace brand tablets and the original 40 mg/mL Megace oral suspension are discontinued. Megace ES is the brand name for the concentrated 625 mg/5 mL (125 mg/mL) oral suspension. Generic megestrol acetate is available in tablets and in both suspension concentrations.

Its FDA-approved uses depend on the dosage form, so it matters which one your prescription is for. The 20 mg and 40 mg tablets are approved for the palliative treatment of advanced carcinoma of the breast or endometrium (recurrent, inoperable, or metastatic disease). The tablets are not a substitute for surgery, radiation, or chemotherapy. The oral suspension (40 mg/mL) and the concentrated suspension (125 mg/mL, Megace ES) are approved to treat anorexia, cachexia, or unexplained significant weight loss in patients with a diagnosis of AIDS. Your prescriber will choose the form and strength that fits your situation.

Megestrol acetate cost without insurance and how to save

Megestrol acetate is available as a generic, and generics are typically dispensed as cash purchases when you do not have coverage. Cash prices are not standardized: two pharmacies a few miles apart can charge noticeably different amounts for the same drug, strength, and quantity. That is why it pays to compare rather than simply refill where you always have. Prices also vary by dosage form, since tablets and the oral suspensions are priced differently.

An Rx.com coupon is free to use, requires no membership, and can be presented at the pharmacy counter for the cash price shown. Enter your ZIP code above to compare today's prices across more than 60,000 pharmacies, then bring the coupon to the pharmacy you choose. If you have insurance or Medicare, ask the pharmacist to check both your benefit and the coupon price, and use whichever is lower.

Alternatives and related medicines

Megestrol is one of several medicines that come up in these treatment conversations, and the right choice depends entirely on what is being treated. In hormone-related cancer care, medicines such as tamoxifen and anastrozole work by different mechanisms than a progestin. Medroxyprogesterone acetate is another progestin, though its approved uses are not the same as megestrol's.

When the concern is appetite or weight loss, the FDA-approved options are narrow. Dronabinol is approved only for anorexia associated with weight loss in patients with AIDS, and it is a controlled substance (the capsules are Schedule III). Mirtazapine and prednisone have no FDA-approved indication for appetite or weight gain at all; any use for that purpose is off-label, and the evidence behind it is limited and debated. None of these is an equivalent swap for megestrol.

These are not interchangeable substitutes, and none of them should be swapped in on your own. Only your prescriber can say which medicine is appropriate. If cost is what is driving the question, bring it up at your next visit; there is often more than one reasonable option, and comparing cash prices on each can help you and your prescriber pick one you can actually afford to keep taking.

Safety information to know

Megestrol acetate tablets and oral suspension do not carry a boxed warning, but the label describes several risks worth understanding. With long-term use, the drug can suppress the body's stress-hormone (HPA) axis, and new-onset diabetes, Cushing's syndrome, and adrenal insufficiency have been reported. Signs of adrenal insufficiency include low blood pressure, nausea, vomiting, dizziness, or weakness. This is serious, and failure to recognize it may result in death, so tell your care team promptly about these symptoms. Do not stop megestrol abruptly after long-term use; extra steroid coverage may be needed during illness or surgery. The label also notes thromboembolic events including deep vein thrombosis and pulmonary embolism, so caution is advised if you have a history of blood clots. Hyperglycemia and new or worsening diabetes, heart failure, and edema are also described. Weight gain is a frequent effect and is considered a therapeutic effect rather than fluid retention alone.

Megestrol is contraindicated in known or suspected pregnancy because of the risk of fetal harm; animal studies showed reduced fetal weight, fewer live births, and feminization of male fetuses. Pregnancy testing before treatment and effective contraception during treatment are advised for people who could become pregnant. It is also contraindicated in anyone with a history of hypersensitivity to megestrol acetate or any component of the formulation, and women with HIV infection should not breastfeed. Side-effect rates on the label come from the oral suspension studied at 800 mg/day in the AIDS anorexia and cachexia trials: adverse events reported in at least 5% of patients on that dose were diarrhea, impotence, rash, flatulence, hypertension, asthenia, insomnia, nausea, anemia, fever, and decreased libido. Those figures describe the suspension at that dose in that population, and are not a rate list for the 20 mg and 40 mg tablets taken at 40 to 320 mg/day for breast or endometrial cancer. This page is information, not medical advice; talk with your doctor or pharmacist about your own situation.

Sources & accuracy

This Megestrol Acetate information was written and reviewed against authoritative U.S. medical sources — MedlinePlus (U.S. National Library of Medicine), DailyMed, and FDA prescribing information — and checked for accuracy. It is provided for education and is not a substitute for professional medical advice.

Verify the official label: Megestrol Acetate on DailyMed (FDA)

Reviewed against FDA labeling · Last reviewed July 2026

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Medical disclaimer: This information is provided for general educational purposes only and is not medical advice. It is not a substitute for professional diagnosis or treatment. Always consult a licensed physician, pharmacist, or other qualified healthcare provider before starting, stopping, or changing any medication or treatment. Never disregard professional medical advice or delay seeking it because of something you read here. If you think you may have a medical emergency, call your doctor or 911 immediately.


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