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Medical Disclaimer: This information is for educational purposes only and is not a substitute for professional medical advice.
Brand Name
Arthcal Estrogen
Generic Name
Estrogen
Active Ingredient
EstriolCategory
Estrogen [EPC]
Variants
1
Different strengths and dosage forms
| Strength | Form | Route | NDC |
|---|---|---|---|
| .2 g/100mL | CREAM | CUTANEOUS | 85212-0038 |
Detailed information about Arthcal Estrogen
References used for this content
This page is for informational purposes only and does not replace medical advice. Before using any prescription or over-the-counter medication for Arthcal Estrogen, you must consult a qualified healthcare professional.
Estriol is a naturally occurring estrogen used primarily in hormone replacement therapy to treat symptoms of menopause, such as vaginal atrophy. It belongs to the estrogen class of medications and is often considered a 'weak' estrogen due to its short-acting profile.
Dosage for estriol is highly individualized and depends on the condition being treated and the route of administration. Healthcare providers typically aim for the lowest effective dose for the shortest duration necessary.
Estriol is not approved for use in pediatric populations. Its use is specifically indicated for postmenopausal women or those with significant estrogen deficiency. Exposure to estrogens in children can lead to premature bone maturation (closing of growth plates) and early secondary sexual development.
There are no specific dosage adjustment guidelines for patients with kidney disease; however, because estriol metabolites are excreted renally, healthcare providers should monitor these patients closely for potential accumulation or side effects.
Estriol is extensively metabolized by the liver. It is generally contraindicated in patients with acute liver disease or a history of liver dysfunction where liver function tests have not returned to normal. In cases of mild, stable impairment, extreme caution and lower doses are required.
Clinical studies of estriol have generally included women aged 65 and over. While no specific 'age-based' dose reduction is mandated, the 'North American Menopause Society' (NAMS) suggests that older women should be monitored more frequently for cardiovascular and thromboembolic risks associated with any estrogen therapy.
If you miss a dose of estriol:
Acute overdose of estrogen is rarely life-threatening but can cause significant discomfort.
> Important: Follow your healthcare provider's dosing instructions exactly. Do not adjust your dose or stop the medication without medical guidance, as this can lead to a recurrence of symptoms or unexpected bleeding.
Most side effects of estriol are related to the body adjusting to increased estrogen levels. These are often mild and may diminish after the first few weeks of treatment.
> Warning: Stop taking Estriol and call your doctor immediately if you experience any of these serious symptoms.
Long-term use of estrogen therapy, including estriol, is associated with specific risks that must be balanced against the benefits. According to large-scale studies like the Women's Health Initiative (WHI), prolonged use of systemic estrogen may increase the risk of:
While estriol itself (as a compounded or European drug) may not always carry a specific U.S. FDA black box warning label, the FDA requires a class-wide black box warning for all estrogen products. This warning includes:
Report any unusual symptoms to your healthcare provider promptly. Regular follow-ups (typically every 6 to 12 months) are necessary to ensure the treatment remains safe for you.
Estriol is a potent biological signaling molecule. Before starting therapy, a full medical history and physical examination, including a pelvic exam and mammogram, are typically performed. Estriol should be used at the lowest dose that controls symptoms and for the shortest duration consistent with treatment goals.
No specific FDA black box warning exists for Estriol as an individual drug because it is not an FDA-approved manufactured product in the U.S. However, it is clinically managed under the class-wide warnings for Estrogens, which state:
While rare, hypersensitivity to estriol or any components of the cream/tablet (such as preservatives or carrier oils) can occur. If you experience rash, severe itching, or respiratory distress, discontinue use immediately.
Estrogens increase the production of certain clotting factors in the liver. Patients with a history of DVT, pulmonary embolism, or known prothrombotic mutations (like Factor V Leiden) are at a significantly higher risk. Even low-dose vaginal estriol should be used with caution in these individuals.
Any undiagnosed vaginal bleeding in postmenopausal women is a red flag for endometrial cancer until proven otherwise. If you experience 'spotting' while using estriol, your doctor may require an ultrasound or endometrial biopsy.
Estrogens can increase the risk of gallbladder disease requiring surgery. If you have a history of gallstones, discuss this with your provider.
In women with pre-existing hypertriglyceridemia, estrogen therapy may lead to elevations of plasma triglycerides, occasionally leading to pancreatitis.
If you are on long-term estriol therapy, your healthcare provider will likely require:
Estriol is not known to impair the ability to drive or operate heavy machinery. It does not cause sedation or cognitive impairment in standard doses.
There is no direct contraindication between alcohol and estriol. However, chronic heavy alcohol consumption can impair liver function, which is necessary for the proper metabolism of estrogens. Furthermore, alcohol may exacerbate menopausal symptoms like hot flashes.
When stopping estriol, symptoms of vaginal atrophy or vasomotor instability may return. There is generally no 'withdrawal syndrome,' but a gradual tapering of the dose (e.g., moving from twice a week to once a week) may help the body adjust. Always consult your doctor before stopping treatment.
> Important: Discuss all your medical conditions, especially any history of cancer, blood clots, or liver disease, with your healthcare provider before starting Estriol.
Estriol therapy can interfere with several laboratory tests, including:
For each interaction, the management strategy usually involves either avoiding the combination or adjusting the dose of the interacting medication while monitoring for clinical changes.
> Important: Tell your doctor about ALL medications, supplements, and herbal products you are taking, including those purchased over-the-counter.
Estriol must NEVER be used in the following circumstances:
In these conditions, the benefits of estriol must be carefully weighed against the risks:
Patients who have had a severe allergic reaction (anaphylaxis or angioedema) to other estrogen products (such as estradiol patches or conjugated estrogen tablets) should not use estriol, as cross-reactivity is highly likely due to the similar chemical structure of these steroidal hormones.
> Important: Your healthcare provider will evaluate your complete medical history, including family history of cancer and cardiovascular disease, before prescribing Estriol.
FDA Pregnancy Category: X (Contraindicated).
Estriol is naturally very high during pregnancy; however, supplemental estriol has no clinical indication during pregnancy. There is no evidence that estriol is safe for the developing fetus when taken as a medication. If you become pregnant while using estriol, stop use immediately and contact your doctor. Historical data on other estrogens (like DES) showed significant long-term risks to offspring, so the 'precautionary principle' is strictly applied here.
Estriol is excreted into breast milk and can decrease both the quantity and the quality of milk produced. Estrogen therapy is generally not recommended for nursing mothers, especially during the early stages of lactation. If treatment is necessary, your provider will likely suggest non-hormonal alternatives first.
Estriol is not indicated for use in children. Estrogens can cause premature closure of the epiphyses (growth plates) in long bones, leading to permanent short stature. It can also cause 'pseudoprecocious' puberty, involving breast development and vaginal changes in young girls.
In the 'Women's Health Initiative' (WHI) studies, women over the age of 65 who took systemic estrogens had a higher risk of developing probable dementia compared to those taking a placebo. For older women (70+), healthcare providers generally prefer low-dose vaginal estriol over oral forms to minimize systemic absorption and the associated risks of stroke or blood clots. There is also a slight increase in the risk of gallbladder disease in the geriatric population using estrogens.
While no specific dose adjustments are provided in clinical literature, estriol conjugates are cleared by the kidneys. In patients with severe renal failure or those on dialysis, there is a theoretical risk of metabolite accumulation. Monitoring for estrogenic side effects (like breast tenderness or edema) is advised.
Estriol is contraindicated in patients with acute or severe liver disease. In patients with mild hepatic impairment, the liver's ability to conjugate and clear the hormone is reduced, which can lead to higher systemic levels and increased risk of adverse effects. If used, it must be under the strictest medical supervision with frequent liver enzyme monitoring.
> Important: Special populations require individualized medical assessment. Always inform your specialist about your age, pregnancy status, and any organ dysfunction.
Estriol is a steroidal estrogen. It enters target cells by diffusing through the cell membrane and binds to Estrogen Receptors (ERα and ERβ).
What makes estriol unique is its short nuclear retention time. While estradiol stays bound to the receptor inside the nucleus for 6 to 24 hours, estriol typically stays bound for only 1 to 4 hours. This means it can trigger 'early' estrogenic responses (like increasing vaginal blood flow and mucus production) but is less likely to trigger 'late' responses (like massive cell division in the uterine lining) unless it is administered in very frequent, high doses. This 'weak' affinity is why it is often preferred for localized vaginal therapy.
| Parameter | Value |
|---|---|
| Bioavailability | <10-20% (Oral); High (Vaginal/Local) |
| Protein Binding | ~90-95% (Primarily to Albumin) |
| Half-life | 6 - 9 Hours |
| Tmax | 1 - 2 Hours (Oral) |
| Metabolism | Hepatic (Glucuronidation and Sulfation) |
| Excretion | Renal (>90% as conjugates) |
Estriol is part of the Estrogen [EPC] class. It is a natural bioidentical hormone. Related medications include Estradiol (Vagifem, Estrace), Estrone, and Conjugated Equine Estrogens (Premarin).
Common questions about Arthcal Estrogen
Estriol is primarily used to treat symptoms of menopause, specifically those affecting the vaginal and urinary tracts, known as genitourinary syndrome of menopause (GSM). It helps relieve vaginal dryness, itching, and pain during intercourse by thickening the vaginal lining and restoring moisture. Additionally, it may be used to prevent recurrent urinary tract infections in postmenopausal women by improving the health of the urethral tissues. In some regions, it is also used as part of a broader hormone replacement therapy (HRT) regimen to manage hot flashes. Your doctor will determine the best use based on your specific symptoms.
The most common side effects of estriol, especially when used vaginally, include local irritation such as stinging or burning upon application. Some women may also experience increased vaginal discharge, breast tenderness, or mild headaches as their body adjusts to the hormone. These symptoms are usually temporary and often resolve after a few weeks of consistent use. If you experience persistent breast pain or significant swelling, you should contact your healthcare provider. Because it is a 'weak' estrogen, systemic side effects are generally less frequent than with other forms of estrogen.
There is no known direct interaction between alcohol and estriol that would make the combination immediately dangerous. However, alcohol can affect how your liver functions, and since the liver is responsible for metabolizing estrogens, heavy drinking could theoretically interfere with your hormone levels. Additionally, alcohol is a known trigger for menopausal symptoms like hot flashes and night sweats, which might counteract the benefits of the medication. For the best results, it is recommended to consume alcohol only in moderation while undergoing hormone therapy. Always discuss your lifestyle habits with your doctor.
No, estriol is not considered safe for use during pregnancy and is classified as FDA Pregnancy Category X. While the body naturally produces high levels of estriol during pregnancy, taking supplemental estrogen can potentially interfere with fetal development or cause harm. If you suspect you are pregnant or are planning to become pregnant, you must stop using estriol immediately and consult your physician. It is also generally avoided during breastfeeding as it can reduce the quantity and quality of breast milk. Hormone replacement therapy is specifically designed for postmenopausal or estrogen-deficient states.
For vaginal symptoms like dryness and pain during intercourse, many women begin to notice an improvement within 1 to 2 weeks of daily use. However, it typically takes about 4 to 12 weeks of consistent therapy to achieve the full therapeutic effect and significant tissue restoration. During the initial 'loading phase,' the medication is usually applied daily, followed by a 'maintenance phase' of twice-weekly applications. If you do not see an improvement in your symptoms after 4 weeks, consult your healthcare provider to discuss a possible dose adjustment. Patience is key, as the tissues need time to physically regenerate.
You can stop taking estriol suddenly without experiencing dangerous withdrawal symptoms, but your menopausal symptoms are likely to return. Vaginal dryness, itching, and discomfort usually reappear within a few weeks of stopping the medication because the underlying estrogen deficiency remains. If you wish to discontinue treatment, it is often better to gradually reduce the frequency of application to see if your symptoms remain manageable. Always talk to your doctor before stopping, as they can help you transition to alternative therapies or a lower maintenance dose. They will also need to monitor you for any return of symptoms.
If you miss a dose of estriol vaginal cream or suppository, apply it as soon as you remember. If it is already the next day or very close to your next scheduled dose, skip the missed dose and continue with your regular schedule. Do not apply a double dose to make up for the one you missed, as this could increase the risk of side effects like breast tenderness or spotting. Consistency is important for maintaining the health of the vaginal tissues, so try to use a reminder if you find it difficult to remember your applications. If you miss several doses, your symptoms may start to return.
Weight gain is not a common side effect of low-dose vaginal estriol, though some women report mild fluid retention or bloating when they first start estrogen therapy. Systemic estrogens can sometimes lead to changes in fat distribution or water retention, but the amount of estriol absorbed into the bloodstream from vaginal products is typically very low. It is important to remember that weight changes are also a common part of the natural aging process and the metabolic shifts that occur during menopause. If you notice sudden or significant weight gain, you should discuss it with your doctor to rule out other causes like thyroid issues or cardiovascular changes.
Estriol can interact with several types of medications, so a full review of your current prescriptions is necessary. It should not be taken with aromatase inhibitors used for breast cancer, as it can stop them from working. It may also interfere with the effectiveness of certain blood thinners, thyroid medications, and anti-seizure drugs like lamotrigine. Herbal supplements like St. John's Wort can speed up the breakdown of estriol, making it less effective. Always provide your healthcare provider with a complete list of all medications, vitamins, and herbs you are taking to ensure there are no dangerous interactions.
In many countries outside the U.S., estriol is available as a low-cost generic vaginal cream or tablet. In the United States, because estriol is not an FDA-approved 'brand name' drug, it is primarily available through compounding pharmacies. These pharmacies create 'generic' or customized versions of estriol based on a doctor's specific prescription. While these are not 'generic' in the traditional sense of an FDA-approved equivalent, they serve a similar purpose. Always ensure you are obtaining your medication from a reputable, licensed pharmacy to ensure the quality and concentration of the active ingredient.
Other drugs with the same active ingredient (Estriol)