Prempro (Estrogen/Medroxyprogesterone)

Premia Continuous, Premique

Prescription Required
Brand
Dose Size & Price Qty
0.30mg / 1.5mg
0.45mg / 1.5mg
0.625mg / 2.5mg
0.625mg / 5.0mg
Generic
Dose Size & Price Qty
0.30mg/1.5mg
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Fact Table

Fact Table
Formula Variable (combination of conjugated estrogens + medroxyprogesterone acetate)
License FDA approved (1995); widely approved internationally
Bioavailability Conjugated estrogens: ~3–10%; Medroxyprogesterone acetate: ~100% (oral)
Legal status Prescription only (Rx)
Chemical Name Mixture of sodium estrone sulfate and related estrogen sulfates; Medroxyprogesterone acetate: (6a)-6-methylpregn-4-ene-3,20-dione acetate
Elimination half-life Estrogens: ~12–24 hours; Medroxyprogesterone acetate: ~30–60 hours
Dosage (Strength) Tablets containing conjugated estrogens 0.3–0.625 mg with medroxyprogesterone acetate 1.5–5 mg (once daily)
Pregnancy Category X – Contraindicated in pregnancy
Brands Prempro, Premphase
Protein binding Estrogens: ~95–99%; Medroxyprogesterone acetate: ~90%
PubChem CID Estrogens: multiple; Medroxyprogesterone acetate: 6279
MedlinePlus a601041
ChEBI Estrogens: mixture; Medroxyprogesterone acetate: 6716
ATC code G03FA12
DrugBank DB00208 (medroxyprogesterone acetate); estrogens: multiple entries
KEGG D00963 (medroxyprogesterone acetate)
Routes of administration By mouth (oral tablets)

Prempro is a hormone therapy used to treat moderate to severe menopause symptoms. It contains two hormones: conjugated estrogens, which are a mixture of estrogen hormones derived from natural sources, and medroxyprogesterone acetate, a form of progesterone. These hormones help replace those the body makes less of after menopause. Prempro may help manage hot flashes, night sweats, and vaginal symptoms such as dryness or irritation. It may also help lower the risk of bone loss (osteoporosis) after menopause.

Directions

Prempro is usually taken as one tablet by mouth once daily. Take the tablet at the same time each day, with or without food, and swallow the tablet whole with water. If a dose is missed, take it as soon as remembered unless it's almost time for the next scheduled dose. In that case, skip the missed dose and resume the regular schedule. Don't take two tablets at once to make up for a missed dose.

Ingredients

The active ingredients in Prempro are conjugated estrogens and medroxyprogesterone acetate.

Cautions

  • Before using this medication, you may want to consult a healthcare provider about the following:
    • Any existing health conditions
    • Any allergies
    • A list of all medications currently being taken
  • Prempro can increase the risk of blood clots, stroke, heart attack, and pulmonary embolism, especially during the first year of use, and treatment should be stopped if any of these are suspected.
  • The risk of these heart and blood vessel problems is higher if you smoke or have conditions like high blood pressure, diabetes, high cholesterol, obesity, or a personal or family history of blood clots.
  • Using estrogen with a progestin may increase the risk of breast cancer, particularly with longer use, and regular breast exams and mammograms are important while taking this medication.
  • Estrogen therapy can increase the risk of cancer of the uterus if a woman still has her uterus, which is why progestin is included to help lower this risk.
  • Hormone therapy has been linked to a higher risk of ovarian cancer, although the overall number of cases remains low.
  • In women aged 65 and older, Prempro has been associated with an increased risk of memory problems or probable dementia.
  • Estrogens can increase the risk of gallbladder disease and may lead to gallbladder surgery in some women.
  • Prempro may cause changes in calcium levels, vision problems, or sudden vision loss, and the medication should be stopped if these symptoms occur.
  • Estrogen therapy can worsen certain conditions such as migraines, asthma, diabetes, lupus, epilepsy, high triglycerides, liver disease, or thyroid disorders, and close monitoring may be needed.
  • Serious allergic reactions, including swelling of the face, lips, tongue, or throat, have been reported, and Prempro should not be used again if this happens.

Contraindications

Avoid taking or using this medication if any of the following apply:

  • Undiagnosed abnormal genital bleeding
  • Known, suspected, or history of breast cancer
  • Known or suspected estrogen-dependent cancer
  • Active deep vein thrombosis (DVT), pulmonary embolism (PE), or a history of these conditions
  • Active arterial thromboembolic disease, such as stroke or heart attack, or a history of these conditions
  • Liver dysfunction or disease
  • Known hypersensitivity to estrogens, progestins, or any ingredients in the product
  • Known or suspected pregnancy

Side Effects

Common side effects of Prempro include:

  • Headache
  • Breast pain or tenderness
  • Irregular vaginal bleeding or spotting
  • Stomach or abdominal cramps, bloating
  • Nausea or vomiting
  • Hair loss
  • Fluid retention
  • Vaginal yeast infection

Headache, breast tenderness, and nausea are most noticeable when starting treatment or after a dose change. Irregular bleeding or spotting can occur, especially during the first months of use. Many symptoms improve as your body adjusts.

More serious side effects include heart attack, stroke, blood clots, breast cancer, cancers of the uterus or ovary, gallbladder disease, liver problems, severe allergic reactions, and changes in blood pressure or cholesterol levels. Contact a healthcare provider if you notice chest pain, sudden headaches, vision or speech changes, leg pain or swelling, or unusual vaginal bleeding.

Frequently Asked Questions about Prempro


What is Prempro used for?

Prempro is a combination hormone replacement therapy (HRT) used to treat moderate to severe symptoms of menopause such as hot flashes, night sweats, and vaginal dryness. It is also prescribed to help prevent postmenopausal osteoporosis in women who are at high risk and cannot take non-estrogen treatments.


How does Prempro work?

Prempro combines conjugated estrogens and medroxyprogesterone acetate. Estrogens help relieve menopause symptoms, while medroxyprogesterone, a progestin, reduces the risk of endometrial cancer that can occur when estrogen is used alone in women with a uterus.


Who should not take Prempro?

Prempro should not be used by women who have a history of breast cancer, uterine cancer, blood clots, stroke, liver disease, or unexplained vaginal bleeding. It is also not for use in women who are pregnant or may become pregnant.


What are the common side effects of Prempro?

Common side effects include breast tenderness, headache, nausea, bloating, mood changes, and irregular vaginal bleeding or spotting. Some women may also experience weight changes or abdominal cramps.


Are there serious risks associated with Prempro?

Yes, Prempro may increase the risk of heart disease, stroke, blood clots, breast cancer, and dementia, especially in older postmenopausal women. These risks should be carefully weighed against the benefits before starting therapy.


How should Prempro be taken?

Prempro is taken once daily by mouth, usually at the same time each day. It comes in different strengths, and the dosage should be tailored to the lowest effective dose for the shortest duration needed to manage symptoms.


Can Prempro affect menstrual bleeding?

Yes, Prempro can cause irregular vaginal bleeding, especially during the first few months of use. If bleeding persists or is heavy, it should be evaluated by a healthcare provider to rule out other causes.


Can Prempro be used long-term?

Prempro is generally recommended for short-term use due to its associated risks. Long-term use should be regularly reviewed by a healthcare provider to ensure continued need and safety.


Can Prempro interact with other medications?

Yes, Prempro can interact with certain medications including anticonvulsants, antibiotics, thyroid medications, and herbal products like St. John's Wort. These interactions can affect how Prempro or other drugs work.


What should I do if I miss a dose of Prempro?

If you miss a dose, take it as soon as you remember. If it's almost time for your next dose, skip the missed one and resume your regular schedule. Do not take two doses at once to make up for a missed dose.

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October 01, 2025
All great!

Very satisfied with the product, no complaints.

Deborah Pucillo