Prempro 0.45mg/1.5mg Tabs 28's

Manufacturer PFIZER Active Ingredient Estrogens (Conjugated/Equine) and Medroxyprogesterone(ES troe jenz KON joo gate ed/EE kwine & me DROKS ee proe JES te rone) Pronunciation PREM-pro (active ingredients: ES-troe-jenz KON-joo-gay-ted/EE-kwine & me-DROK-see-PROE-jes-te-rone)
WARNING: Do not use this drug to prevent heart disease or dementia. A study of women taking an estrogen with a progestin showed a raised chance of heart attack, stroke, blood clot, breast cancer, and dementia. The chance of stroke, blood clot, and dementia was also raised when the estrogen was taken alone. Not all products and doses were studied. It is not known if the same effects may happen with this drug.The chance of endometrial cancer may be raised with the use of estrogen alone in patients with a uterus. Use of a progestin along with estrogen may lower the risk. Call your doctor right away if you have unexplained or long-lasting vaginal bleeding.Use this drug for the shortest time needed at the lowest useful dose. Your doctor will talk with you on a regular basis to see if you need to keep taking this drug. @ COMMON USES: It is used to treat symptoms of low estrogen levels or prevent soft, brittle bones (osteoporosis) after menopause. If you have been given this drug for some other reason, talk with your doctor for more information.
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Drug Class
Hormone Replacement Therapy (HRT)
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Pharmacologic Class
Estrogen and Progestin Combination
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Pregnancy Category
Category X
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FDA Approved
Mar 1999
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DEA Schedule
Not Controlled

Overview

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What is this medicine?

Prempro is a medication that contains two female hormones, estrogen and progestin. It is used by women after menopause to help with symptoms like hot flashes and vaginal dryness, and to help prevent bone thinning (osteoporosis). The progestin helps protect the lining of the uterus from overgrowth that can be caused by estrogen alone.
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How to Use This Medicine

Taking Your Medication Correctly

To get the most benefit from your medication, it's essential to follow your doctor's instructions carefully. Read all the information provided with your prescription and follow the instructions closely. Take your medication at the same time every day to establish a routine. Continue taking your medication as directed by your doctor or healthcare provider, even if you start to feel better.

Storing and Disposing of Your Medication

To maintain the quality and safety of your medication, store it at room temperature in a dry place, away from the bathroom. Keep all medications in a secure location, out of the reach of children and pets. When disposing of unused or expired medication, do not flush it down the toilet or pour it down the drain unless instructed to do so by your pharmacist or healthcare provider. Instead, check with your pharmacist for guidance on the best disposal method or participate in a local drug take-back program.

What to Do If You Miss a Dose

If you miss a dose, take it as soon as you remember. However, if it's close to the time for your next scheduled dose, skip the missed dose and resume your regular dosing schedule. Do not take two doses at the same time or take extra doses to make up for the missed one.
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Lifestyle & Tips

  • Take the medication exactly as prescribed, usually once daily at the same time.
  • Do not smoke, as smoking significantly increases the risk of blood clots, heart attack, and stroke while on hormone therapy.
  • Maintain a healthy diet rich in calcium and Vitamin D, and engage in regular weight-bearing exercise to support bone health.
  • Attend all scheduled doctor's appointments and screenings, including annual physicals, mammograms, and pelvic exams.
  • Report any unusual vaginal bleeding, breast lumps, or severe side effects to your doctor immediately.

Dosing & Administration

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Adult Dosing

Standard Dose: One tablet (0.45 mg conjugated estrogens / 1.5 mg medroxyprogesterone acetate) orally once daily
Dose Range: 0.45 - 1.5 mg

Condition-Specific Dosing:

vasomotorSymptoms: For the treatment of moderate to severe vasomotor symptoms associated with menopause.
vulvarVaginalAtrophy: For the treatment of moderate to severe symptoms of vulvar and vaginal atrophy associated with menopause.
osteoporosisPrevention: For the prevention of postmenopausal osteoporosis.
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Pediatric Dosing

Neonatal: Not established
Infant: Not established
Child: Not established
Adolescent: Not established
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Dose Adjustments

Renal Impairment:

Mild: No specific dose adjustment recommended, use with caution.
Moderate: No specific dose adjustment recommended, use with caution.
Severe: No specific dose adjustment recommended, use with caution. Monitor for adverse effects.
Dialysis: Not specifically studied; use with caution.

Hepatic Impairment:

Mild: Use with caution. Estrogens and progestins are extensively metabolized by the liver.
Moderate: Contraindicated in patients with significant hepatic dysfunction or disease.
Severe: Contraindicated in patients with significant hepatic dysfunction or disease.
Confidence: High

Pharmacology

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Mechanism of Action

Conjugated estrogens act by binding to estrogen receptors in target tissues, regulating gene expression and mediating estrogenic effects. Medroxyprogesterone acetate (MPA) is a synthetic progestin that acts by binding to progesterone receptors, primarily to counteract the estrogen-induced proliferation of the endometrium, thereby reducing the risk of endometrial hyperplasia and carcinoma associated with unopposed estrogen therapy.
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Pharmacokinetics

Absorption:

Bioavailability: Conjugated Estrogens: Variable, generally good. Medroxyprogesterone Acetate: Good oral absorption.
Tmax: Conjugated Estrogens: Variable (e.g., estrone ~6-10 hours). Medroxyprogesterone Acetate: ~2-4 hours.
FoodEffect: Food may slightly alter absorption but is generally not clinically significant for dosing.

Distribution:

Vd: Conjugated Estrogens: Not precisely defined for the mixture, but widely distributed. Medroxyprogesterone Acetate: ~20 Âą 3 L/kg.
ProteinBinding: Conjugated Estrogens: Highly bound to sex hormone-binding globulin (SHBG) and albumin. Medroxyprogesterone Acetate: ~90% bound to plasma proteins (primarily albumin).
CnssPenetration: Limited (estrogens and progestins can cross the blood-brain barrier, but CNS penetration for therapeutic effects is not primary).

Elimination:

HalfLife: Conjugated Estrogens: Variable, estrone ~10-16 hours. Medroxyprogesterone Acetate: ~17-24 hours.
Clearance: Not precisely defined for the mixture. Medroxyprogesterone Acetate: ~0.8 L/min.
ExcretionRoute: Primarily renal (urine) as glucuronide and sulfate conjugates; some fecal excretion.
Unchanged: Minimal unchanged drug excreted.
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Pharmacodynamics

OnsetOfAction: Symptomatic relief may begin within weeks, but full therapeutic effect (e.g., bone density) may take months.
PeakEffect: Peak symptomatic relief typically within 3-6 months.
DurationOfAction: Effects persist as long as therapy is continued; hormonal effects are maintained with daily dosing.
Confidence: Medium

Safety & Warnings

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BLACK BOX WARNING

Estrogens and progestins should not be used for the prevention of cardiovascular disease or dementia. The Women's Health Initiative (WHI) study reported increased risks of myocardial infarction, stroke, invasive breast cancer, pulmonary emboli, and deep vein thrombosis in postmenopausal women (50-79 years of age) during 5.6 years of treatment with daily oral conjugated estrogens (0.625 mg) combined with medroxyprogesterone acetate (2.5 mg) relative to placebo. The WHI Memory Study (WHIMS) reported an increased risk of probable dementia in postmenopausal women 65 years of age or older during 4 years of treatment with daily oral conjugated estrogens (0.625 mg) combined with medroxyprogesterone acetate (2.5 mg) relative to placebo. These risks apply to Prempro.
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Side Effects

Serious Side Effects: Seek Medical Attention Immediately

Although rare, some people may experience severe and potentially life-threatening side effects while taking this medication. If you notice any of the following symptoms, contact your doctor or seek medical help right away:

Signs of an allergic reaction: rash, hives, itching, red, swollen, blistered, or peeling skin (with or without fever), wheezing, tightness in the chest or throat, trouble breathing, swallowing, or talking, unusual hoarseness, or swelling of the mouth, face, lips, tongue, or throat.
Signs of liver problems: dark urine, tiredness, decreased appetite, upset stomach or stomach pain, light-colored stools, vomiting, or yellow skin or eyes.
Signs of high blood pressure: severe headache or dizziness, fainting, or changes in vision.
Signs of gallbladder problems: pain in the upper right belly area, right shoulder area, or between the shoulder blades; yellow skin or eyes; fever with chills; bloating; or severe upset stomach or vomiting.
Signs of pancreatitis (pancreas problem): severe stomach pain, severe back pain, or severe upset stomach or vomiting.
Weakness on one side of the body, trouble speaking or thinking, changes in balance, drooping on one side of the face, or blurred vision.
Changes in eyesight or loss of eyesight, bulging eyes, or changes in how contact lenses feel.
Breast-related symptoms: lump in the breast, breast pain or soreness, or nipple discharge.
Pelvic pain.
Vaginal symptoms: itching, discharge, or abnormal bleeding.
Depression or other mood changes.
Memory problems or loss.

This medication may cause fluid retention, leading to swelling or weight gain. If you experience swelling, weight gain, or trouble breathing, inform your doctor.

Blood Clots and High Calcium Levels

Seek immediate medical attention if you experience signs of a blood clot, such as:

Chest pain or pressure
Coughing up blood
Shortness of breath
Swelling, warmth, numbness, color change, or pain in a leg or arm
Trouble speaking or swallowing

High calcium levels have been reported in some people with cancer taking medications like this one. If you experience any of the following symptoms, contact your doctor right away:

Weakness
Confusion
Fatigue
Headache
Upset stomach or vomiting
Constipation
Bone pain

Other Side Effects

Like all medications, this drug can cause side effects. While many people may not experience any side effects or only minor ones, it's essential to discuss any concerns with your doctor. If you experience any of the following side effects or any other symptoms that bother you or do not go away, contact your doctor:

Feeling tired or weak
Back pain
Headache
Upset stomach or vomiting
Gas
Stomach pain or cramps
Bloating
Enlarged breasts
Tender breasts
Hair loss

This is not an exhaustive list of potential side effects. If you have questions or concerns, contact your doctor. You can also report side effects to the FDA at 1-800-332-1088 or online at https://www.fda.gov/medwatch.
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Seek Immediate Medical Attention If You Experience:

  • Sudden severe headache, dizziness, or fainting
  • Sudden vision changes or loss
  • Chest pain, shortness of breath, coughing up blood
  • Pain, swelling, or tenderness in one leg (especially calf or thigh)
  • Weakness or numbness in an arm or leg, especially on one side of the body
  • Slurred speech or difficulty speaking
  • New breast lump or changes in the breast
  • Unusual vaginal bleeding or spotting after menopause
  • Yellowing of the skin or eyes (jaundice)
  • Severe abdominal pain
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Before Using This Medicine

Before Taking This Medication: Important Information to Share with Your Doctor

It is essential to inform your doctor about the following:

Any allergies you have, including allergies to this medication, its components, or other substances, such as foods or drugs. Describe the allergic reaction you experienced, including the symptoms that occurred.
A history of certain health conditions, including:
+ Bleeding disorders
+ Blood clots or an increased risk of developing blood clots
+ Breast cancer
+ Liver problems or liver tumors
+ Heart attack
+ Stroke
+ Tumors that are sensitive to estrogen
Unexplained vaginal bleeding
Previous removal of the uterus (hysterectomy)
Pregnancy or suspected pregnancy. Do not take this medication if you are pregnant.

This medication may interact with other medications or health conditions. Therefore, it is crucial to provide your doctor and pharmacist with a comprehensive list of:
All prescription and over-the-counter (OTC) medications you are taking
Natural products and vitamins you are using
Any health problems you have

Before starting, stopping, or changing the dose of any medication, including this one, consult with your doctor to ensure your safety. This list is not exhaustive, and your doctor and pharmacist need to be aware of all your medications and health problems to determine if it is safe for you to take this medication.
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Precautions & Cautions

Important Warnings and Cautions

Before taking this medication, inform all your healthcare providers, including doctors, nurses, pharmacists, and dentists, that you are using this drug. Your doctor may instruct you to stop taking this medication before certain surgical procedures, and will advise you on when to resume taking it after the surgery or procedure.

If you have diabetes, it is crucial to closely monitor your blood sugar levels while taking this medication. Additionally, be aware that this medication may cause high blood pressure, so follow your doctor's instructions for regular blood pressure checks.

High triglyceride levels have been associated with this medication, so notify your doctor if you have a history of elevated triglycerides. Regular blood tests and bone density checks are also necessary, as directed by your doctor.

To ensure your overall health, maintain a regular schedule of breast exams, gynecology check-ups, and breast self-exams, as advised by your doctor. Be aware that this medication may affect certain laboratory tests, so inform all your healthcare providers and lab personnel that you are taking this drug.

To minimize potential risks, limit your alcohol consumption and avoid smoking, as it increases the risk of heart disease. Discuss your smoking habits with your doctor. If you regularly consume grapefruit juice or eat grapefruit, consult with your doctor about potential interactions.

If you anticipate being immobile for extended periods, such as during long trips, bedrest after surgery, or illness, discuss this with your doctor, as prolonged immobility may increase the risk of blood clots.

This medication may cause dark skin patches on your face, so avoid excessive sun exposure, sunlamps, and tanning beds. Use sunscreen and protective clothing and eyewear to minimize your risk. Be aware that the risk of certain side effects, such as heart attack, stroke, breast cancer, and ovarian cancer, may vary depending on factors like the duration of estrogen use, combination with progestin, and other individual factors. Discuss the benefits and risks of this medication with your doctor.

If you are 65 or older, use this medication with caution, as you may be more susceptible to side effects. If you are breastfeeding, consult with your doctor to discuss potential risks to your baby.

Osteoporosis Prevention

To maximize the effectiveness of this medication, use it in conjunction with calcium and vitamin D supplements, and engage in weight-bearing exercises, such as walking or physical therapy, as directed by your doctor. Adhere to the diet and exercise plan recommended by your doctor to maintain optimal bone health.
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Overdose Information

Overdose Symptoms:

  • Nausea
  • Vomiting
  • Breast tenderness
  • Abdominal pain
  • Drowsiness/fatigue
  • Withdrawal bleeding (in females)

What to Do:

There is no specific antidote. Treatment is symptomatic and supportive. In case of suspected overdose, contact a poison control center (e.g., 1-800-222-1222) or seek emergency medical attention immediately.

Drug Interactions

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Major Interactions

  • Aromatase inhibitors (e.g., anastrozole, letrozole): Concurrent use may reduce efficacy of aromatase inhibitors.
  • Tranexamic acid: Increased risk of thrombosis.
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Moderate Interactions

  • CYP3A4 inducers (e.g., rifampin, carbamazepine, phenytoin, phenobarbital, St. John's Wort): May decrease estrogen and progestin levels, reducing efficacy.
  • CYP3A4 inhibitors (e.g., ketoconazole, itraconazole, clarithromycin, erythromycin, ritonavir, grapefruit juice): May increase estrogen and progestin levels, increasing risk of adverse effects.
  • Thyroid hormone replacement (e.g., levothyroxine): Estrogens can increase thyroid-binding globulin (TBG), potentially increasing thyroid hormone requirements.
  • Anticoagulants (e.g., warfarin): Estrogens may alter clotting factors, potentially affecting anticoagulant response. Close monitoring of INR is recommended.
  • Corticosteroids: Estrogens may decrease the clearance of corticosteroids, leading to increased effects.
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Minor Interactions

  • Lamotrigine: Estrogens may decrease lamotrigine levels, potentially leading to loss of seizure control.
  • Cyclosporine: Estrogens may increase cyclosporine levels, increasing risk of toxicity.

Monitoring

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Baseline Monitoring

Complete medical history and physical examination

Rationale: To identify contraindications, risk factors, and establish baseline health status.

Timing: Prior to initiation of therapy.

Blood pressure

Rationale: Estrogens can affect blood pressure.

Timing: Prior to initiation.

Lipid profile (total cholesterol, HDL, LDL, triglycerides)

Rationale: Estrogens can affect lipid metabolism.

Timing: Prior to initiation.

Mammography

Rationale: To screen for pre-existing breast abnormalities and establish baseline for breast cancer surveillance.

Timing: Prior to initiation, as per screening guidelines.

Pelvic examination and Pap test

Rationale: To screen for gynecological conditions and cervical cancer.

Timing: Prior to initiation, as per screening guidelines.

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Routine Monitoring

Annual physical examination

Frequency: Annually

Target: Normal

Action Threshold: Any significant change or new symptom.

Blood pressure

Frequency: Annually, or more frequently if indicated.

Target: <130/80 mmHg (general guideline)

Action Threshold: Sustained elevation requiring intervention.

Mammography

Frequency: Annually, or as per national screening guidelines.

Target: No suspicious findings

Action Threshold: New mass, calcifications, or other suspicious findings requiring further investigation.

Pelvic examination and Pap test

Frequency: Annually, or as per national screening guidelines.

Target: Normal

Action Threshold: Abnormal bleeding, pain, or suspicious findings.

Breast self-examination/clinical breast exam

Frequency: Monthly (self-exam), Annually (clinical exam)

Target: No new lumps or changes

Action Threshold: Any new lump, skin changes, nipple discharge, or pain.

Assessment of symptoms (vasomotor, vaginal, quality of life)

Frequency: Regularly (e.g., every 3-6 months initially, then annually)

Target: Improved/controlled symptoms

Action Threshold: Worsening symptoms, new symptoms, or intolerable side effects.

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Symptom Monitoring

  • Unusual vaginal bleeding or spotting
  • New breast lump or changes
  • Chest pain, shortness of breath, sudden severe headache
  • Sudden vision changes or loss
  • Pain, swelling, or redness in leg (DVT symptoms)
  • Yellowing of skin or eyes (jaundice)
  • Severe abdominal pain
  • Memory loss or cognitive decline (especially in older women)

Special Patient Groups

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Pregnancy

Contraindicated in pregnancy. There is no indication for Prempro in pregnancy, and there is evidence of fetal harm.

Trimester-Specific Risks:

First Trimester: Potential for adverse effects on fetal development, including genital abnormalities in female fetuses (e.g., masculinization) and cardiovascular defects.
Second Trimester: Not applicable, as use is contraindicated.
Third Trimester: Not applicable, as use is contraindicated.
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Lactation

Contraindicated during lactation. Estrogens and progestins are excreted in human milk and may decrease the quantity and quality of breast milk. Potential adverse effects on the breastfed infant are unknown but possible.

Infant Risk: L5 (Contraindicated - significant documented risk or known to be harmful).
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Pediatric Use

Not indicated for use in pediatric patients. Safety and efficacy have not been established.

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Geriatric Use

Use with caution in women aged 65 years and older. The WHI study showed an increased risk of probable dementia in women 65 years and older. The lowest effective dose for the shortest duration consistent with treatment goals should be used. Regular reassessment of the need for continued therapy is crucial.

Clinical Information

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Clinical Pearls

  • Prempro is a continuous combined HRT, meaning both estrogen and progestin are taken daily, which typically results in amenorrhea (no bleeding) in most women after the first few months.
  • The primary goal of HRT is to manage menopausal symptoms and/or prevent osteoporosis; it is NOT for the prevention of cardiovascular disease or dementia.
  • Always discuss the Black Box Warning risks (cardiovascular events, breast cancer, dementia) with patients before initiating therapy.
  • Regular monitoring, including annual mammograms and pelvic exams, is crucial for women on HRT.
  • Consider discontinuing therapy or reducing dose if symptoms are well-controlled or if risks outweigh benefits, especially after 3-5 years of use.
  • Patients should be advised to report any abnormal vaginal bleeding immediately, as it may require investigation to rule out endometrial pathology.
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Alternative Therapies

  • Estrogen-only therapy (e.g., Premarin, Estrace) for women with hysterectomy.
  • Progestin-only therapy (e.g., Provera) for specific indications.
  • Selective Estrogen Receptor Modulators (SERMs) (e.g., ospemifene for dyspareunia, raloxifene for osteoporosis prevention).
  • Non-hormonal therapies for vasomotor symptoms (e.g., SSRIs/SNRIs like paroxetine, venlafaxine; gabapentin; clonidine).
  • Local vaginal estrogen for isolated vaginal atrophy symptoms.
  • Bisphosphonates or other anti-resorptive agents for osteoporosis treatment/prevention.
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Cost & Coverage

Average Cost: $150 - $250 per 30 tablets
Generic Available: Yes
Insurance Coverage: Tier 2 or Tier 3 (often requires prior authorization or step therapy for brand, generic is usually preferred)
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General Drug Facts

If your symptoms or health issues persist or worsen, it's essential to contact your doctor for further guidance. To ensure your safety, never share your medication with others or take someone else's medication. Some medications may come with an additional patient information leaflet, so be sure to check with your pharmacist for more information. If you have any questions or concerns about your medication, don't hesitate to reach out to your doctor, nurse, pharmacist, or other healthcare provider. In the event of a suspected overdose, immediately call your local poison control center or seek emergency medical attention. When seeking help, be prepared to provide details about the medication taken, the amount, and the time it occurred.