Important Safety Information for Estradiol Products
Please carefully read the following safety information regarding your prescriptions of estradiol products:
Risks and Precautions:
- Estrogen and progesterone therapies may increase the risk of blood clots, stroke, heart attack, and breast cancer, most often when used long-term or at higher doses.
- These medications are not recommended if you have a history of blood clots, stroke, heart disease, advanced liver disease, or certain cancers, unless specifically approved by your provider.
- Notify your healthcare provider immediately if you experience symptoms such as unusual chest pain, shortness of breath, severe headaches, vision changes, significant swelling, or unexpected vaginal bleeding.
Usage Guidelines:
- Take your medications exactly as prescribed by your healthcare provider.
- Do not share your medications with others.
- Inform your healthcare provider about all medications, supplements, and herbal products you are taking to avoid potential interactions.
Off Label:
- The use of these compounded medications for this indication is off-label. Compounded medications are not FDA-approved and do not undergo the same safety, effectiveness, or manufacturing review as FDA-approved drugs.
For any questions or concerns regarding your medication, contact our support team immediately.
This statement does not replace individual medical advice provided by your healthcare professional. Always follow the specific instructions given by your provider.
Important Estradiol Safety Information
Black Box Warning
Warning: Endometrial cancer – Using systemic estrogen therapy without progesterone in women who still have a uterus may increase the risk of changes in the uterine lining, including endometrial cancer. Adding progesterone helps reduce the risk of endometrial hyperplasia, which may be a precursor to endometrial cancer. Perform adequate diagnostic measures, including endometrial sampling when indicated, to rule out malignancy in postmenopausal women with undiagnosed persistent or recurring abnormal genital bleeding. Patients should report any persistent or unexpected vaginal bleeding to their healthcare provider for evaluation.
- Use of estrogen-alone therapy should be individualized based on treatment goals and risks for the individual patient.
FDA Labeling Update (February 2026) – In February 2026, the FDA updated boxed warning language for many menopause hormone therapy products after reviewing newer research and expert recommendations. Previous boxed warnings related to breast cancer, blood clots, stroke, heart disease, and dementia were removed from many menopause hormone therapy products to better reflect differences in patient risk, type of hormone therapy, dose, route of administration, and timing of treatment.
While these boxed warnings were updated, hormone therapy may still carry risks for some individuals. Certain forms of estrogen therapy, especially oral estrogen, may increase the risk of blood clots, stroke, or other cardiovascular complications in some patients. Earlier research found an increased risk of breast cancer in women using a specific combination of estrogen and a synthetic progesterone. Later research showed that risk may differ depending on the type of hormones used and whether estrogen is used alone or with progesterone. Patients should discuss the potential risks and benefits of hormone therapy with their healthcare provider based on their personal medical history and treatment goals.
Note regarding compounded medications – Compounded drugs are permitted to be prescribed under federal law but are not FDA-approved and do not undergo safety, effectiveness, or manufacturing review by the FDA. Your Ivim Health provider may recommend certain doses of compounded medications based on your medical evaluation.
What is the FDA-approved use of estradiol?
Estradiol is approved by the FDA for the treatment of menopausal symptoms including hot flashes, vaginal or vulvar dryness and irritation, and the prevention of osteoporosis.
Who should not use estradiol?
You should not take estradiol if you have a history of breast cancer, a blood clot, uncontrolled cardiovascular disease, are pregnant or breastfeeding or have had a known allergic reaction to estradiol.
How should estradiol be administered?
Estradiol that works systemically (on the whole body) can be administered in multiple formulations including an oral capsule or tablet or a topical patch or spray. Estradiol that works only locally in the vagina can be administered via a cream or gel, or a dissolvable tablet.
What should I tell my Ivim provider before starting estradiol?
Estradiol has certain drug interactions. It’s important to tell your Ivim provider all of the medications you are currently taking, including prescription, over-the-counter medications, vitamins, herbal and dietary supplements.
Medications to watch out for (interactions): Please note, this is not an exhaustive list, and interactions are not limited to the following medications.
- Anastrazole
- Antithrombin
- Argatroban
- Bivalirudin
- Dalteparin
- Enoxaparin
- Fezolinetant
- Fondaparinux
- Heparin
- Ospemifene
- Protamine
- Cimetidine
- St. Johns Wort
It’s important to share your entire medical history with your provider. In particular, tell your provider if you have a history of:
- Breast cancer
- Uterine cancer
- Pulmonary embolism
- Deep vein thrombosis
- BRCA gene mutation or other high-risk mutations that increase risk of breast cancer
- Pregnant or breastfeeding
- Endometriosis
- Cardiovascular disease (i.e., stroke, heart attack, hypertension)
What are the most serious side effects that I or a caregiver should monitor for?
If you are experiencing a medical emergency, call 911 or seek immediate medical attention.
The following serious side effects can occur with estradiol. You or a caregiver should carefully monitor for these side effects.
Blood clot (venous thromboembolism) – There is a small, but definite, increased risk of blood clots with estradiol treatment. The risk is most pronounced in patients who have previously had a blood clot. Some signs would be swelling of one leg, or shortness of breath.
Stroke and Heart attack – Although very rare, signs would include weakness or numbness of one side of the body, difficulty speaking, slurred speech, confusion, vision changes, chest pain or pressure, and/or shortness of breath. Any of these symptoms should prompt urgent ED evaluation.
Serious Allergic Reactions: Stop using estradiol right away if you experience symptoms of a serious allergic reaction, including swelling of your face, lips, tongue or throat, severe rash or itching, very rapid heartbeat, problems breathing or swallowing, or fainting or feeling dizzy.
What are the most common side effects of estradiol/estriol?
- Headaches
- Mood changes
- Breast tenderness
- Acne
- Hair changes
- Weight gain
- Trouble sleeping
- Vaginal bleeding
- Irritability
This information is not comprehensive. Please see full prescribing information for estrogen patches and oral estrogen administration for complete safety information.
Disclaimer: Estradiol is available as a compounded medication through licensed compounding pharmacies. Compounded medications are not FDA-approved but are prepared by pharmacists to meet individual patient needs based on a valid prescription. The safety, efficacy, and quality of compounded estradiol may vary depending on the pharmacy and formulation. Always consult with a licensed healthcare provider before starting any compounded therapy.
This document may include information about the use of medications, supplements, or therapies that are not approved by the U.S. Food and Drug Administration (FDA) for the specific indication discussed. Such “off-label” use is based on clinical judgment, emerging research, or standard of care guidelines and is intended to support safe, evidence-informed decision-making.
