| 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.
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.
The active ingredients in Prempro are conjugated estrogens and medroxyprogesterone acetate.
Avoid taking or using this medication if any of the following apply:
Common side effects of Prempro include:
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.
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.
Very satisfied with the product, no complaints.
A generic drug is a copy of the brand-name drug with the same dosage, safety, strength, quality, consumption method, performance, and intended use. Before generics become available on the market, the generic company must prove it has the same active ingredients as the brand-name drug and works in the same way and in the same amount of time in the body.
The only differences between generics and their brand-name counterparts is that generics are less expensive and may look slightly different (e.g., different shape or color), as trademark laws prevent a generic from looking exactly like the brand-name drug.
Generics are less expensive because generic manufacturers don't have to invest large sums of money to develop a drug. When the brand-name patent expires, generic companies can manufacture a copy of the brand-name and sell it at a substantial discount.