Valestra Tablet

Introduction

Estradiol valerate is a synthetic form of the naturally occurring estrogen, estradiol. It is used in hormone replacement therapy (HRT) and for other medical conditions requiring estrogen supplementation. Estradiol valerate is commonly used in combination with progestogens for menopausal hormone therapy and in gender-affirming hormone therapy for transgender women.

Uses

Estradiol valerate is primarily used for:

Menopausal Symptoms: To relieve symptoms such as hot flashes, vaginal dryness, and mood swings associated with menopause.
Hormone Replacement Therapy: In combination with progestogens, it is used for long-term hormone replacement in postmenopausal women.
Gender-Affirming Hormone Therapy: Used for feminization in transgender women as part of their hormone therapy regimen.
Primary Hypogonadism: To treat symptoms of estrogen deficiency in individuals with primary hypogonadism.

Brand Name	Valestra
Type	Tablet
Weight	1 mg
Generic	Estradiol Valerate
Manufacturer	Nuvista Pharma Ltd.
Available in	English বাংলা

Mechanism of Action

Estradiol valerate works by:

Estrogen Receptor Activation: It binds to estrogen receptors in various tissues, mimicking the effects of natural estrogen. This results in the regulation of reproductive tissues, bone density, and other estrogen-responsive systems.
Reduction in Follicle-Stimulating Hormone (FSH): It suppresses the secretion of FSH from the pituitary gland, which can help in managing menopausal symptoms and hormonal imbalances.

How Long Does It Take to Work?

Estradiol valerate typically begins to show effects within a few weeks of starting therapy. Menopausal symptom relief may be noticeable within 1-2 weeks, but full therapeutic effects may take several months. For gender-affirming therapy, significant changes may take several months to a year.

Absorption

Estradiol valerate is absorbed through the gastrointestinal tract when administered orally or through the subcutaneous tissue when given as an injection. The bioavailability varies depending on the route of administration.

Route of Elimination

Estradiol valerate is metabolized in the liver and excreted primarily through the urine. The metabolic process involves conjugation to glucuronides and sulfates before excretion.

Dosage

Estradiol Valerate is an estrogen-only product. 1 mg tablet to be taken daily. It does not matter at what time of day the woman takes her tablet, but once she has selected a particular time she should keep to it every day. Treatment is continuous, which means that the next pack follows immediately without a break.

For initiation and continuation of treatment of menopausal symptoms, the lowest effective dose for the shortest duration should be used. Treatment to control menopausal symptoms should be initiated with Estradiol Valerate 1 mg tablet. If considered necessary, Estradiol Valerate 2 mg should be used. Once treatment is established the lowest effective does necessary for relief of symptoms should be used.

In women with an intact uterus, a progestogen should be added to Estradiol Valerate 1 mg for at least 12-14 days each month/28 day cycle. Unless there is a previous diagnosis of endometriosis, it is not recommended to add a progestogen in hysterectomised women.

How to start Estradiol Valerate 1 mg: If the woman has an intact uterus and is still menstruating, a combination regimen with Valest and a progestogen, commencing with the oestrogen phase, should begin on the first day of bleeding. If the menstrual periods are very infrequent or if amenorrhoea is established, she may start at any time provided, if appropriate, pregnancy has been excluded.

In women transferring from a continuous combined HRT product, treatment with Estradiol Valerate may be started on any day. In women transferring from cyclic or continuous sequential HRT regimens the woman should complete the cycle and then change to without a break in therapy.

Missed or lost tablets: If the woman forgets to take a tablet at the usual time, she may take it within the following 12 hours. If the woman is more than 12 hours late the forgotten tablet should not be taken and the remaining tablets taken at the usual time on the right days. A missed dose may lead to breakthrough bleeding or spotting.

Pediatric population: Not recommended for children

Method of administration: The tablets can be taken with or without food. The tablets should be swallowed whole with a glass of water or milk. The tablets should be taken at the same time each day.

Dosages of estradiol valerate vary based on the condition being treated:

Menopausal Symptoms: Typically, 1-2 mg orally once daily or as prescribed, often in combination with a progestogen.
Hormone Replacement Therapy: 1-4 mg orally daily, adjusted according to individual response and in combination with progestogens.
Gender-Affirming Therapy: Dosages vary widely; typically, 2-10 mg intramuscularly every 2-4 weeks or as prescribed by a healthcare provider.
Primary Hypogonadism: Dosages are individualized based on clinical response, typically starting at 1-2 mg daily.

Administration

Estradiol valerate can be administered in several forms:

Oral Tablets: Taken daily or as prescribed.
Intramuscular Injection: Typically administered every 2-4 weeks, depending on the condition and treatment plan.

Side Effects

Common side effects include:

Breast Tenderness: A common side effect, especially when starting therapy.
Headache: May occur as a result of hormonal changes.
Nausea: Some individuals may experience gastrointestinal upset.
Weight Gain: Hormonal changes may contribute to weight fluctuations.

Toxicity

Acute toxicity is rare but can occur with excessive dosages. Symptoms of overdose may include severe nausea, vomiting, or signs of estrogen excess. Seek medical attention if symptoms occur.

Precautions

Precautions include:

Cardiovascular Health: Monitor for signs of cardiovascular issues, especially in individuals with a history of heart disease.
Liver Function: Monitor liver function regularly, as estradiol is metabolized in the liver.
Breast Health: Regular breast examinations are advised due to the potential increased risk of breast cancer.

Interaction

Estradiol valerate may interact with:

Other Hormones: May interact with other hormone therapies or contraceptives.
Anticoagulants: Can affect the metabolism of blood thinners, requiring dosage adjustments.
Antiepileptics: Certain anticonvulsants may reduce the effectiveness of estradiol valerate.

Disease Interaction

Considerations for specific conditions include:

Endometriosis: Use with caution, as estrogen can stimulate endometrial tissue growth.
Diabetes: Monitor blood glucose levels, as estrogen may affect glucose metabolism.
Hypertension: Regular monitoring is advised as estrogen may influence blood pressure.

Drug Interaction

Estradiol valerate may interact with various drugs, including:

Antibiotics: Certain antibiotics may reduce the effectiveness of estradiol.
Anticonvulsants: Medications like phenytoin and carbamazepine may lower estradiol levels.
Herbal Supplements: Supplements like St. John's Wort may affect estrogen metabolism.

Food Interactions

No significant food interactions are reported. However, taking estradiol valerate with food may help reduce gastrointestinal irritation.

Pregnancy Use

Estradiol valerate is contraindicated during pregnancy due to the potential for adverse effects on fetal development. It is not recommended for use during pregnancy.

Lactation Use

The use of estradiol valerate during lactation should be approached with caution. It may affect milk production and composition. Consult a healthcare provider before use.

Acute Overdose

In case of acute overdose, symptoms may include severe nausea, vomiting, and abdominal pain. Seek immediate medical attention if an overdose is suspected.

Contraindication

Estradiol valerate is contraindicated in:

Pregnancy: Due to potential harm to the fetus.
History of Estrogen-Sensitive Cancers: Such as breast or endometrial cancer.
Active Liver Disease: As estradiol is metabolized in the liver.
Uncontrolled Hypertension: Due to potential cardiovascular effects.

Use Direction

Follow the prescribed dosage and administration instructions provided by a healthcare provider. Typically, estradiol valerate is taken daily or administered as an injection according to the treatment plan.

Storage Conditions

Store oral tablets in a cool, dry place, away from moisture and heat. Store injectable forms according to the manufacturer's instructions, usually in a refrigerator.

Volume of Distribution

The volume of distribution for estradiol valerate is not well-documented, but it is generally distributed throughout the body’s tissues and fluids, particularly those responsive to estrogen.

Half Life

The half-life of estradiol valerate is approximately 4-6 hours after oral administration. The half-life can be longer for the injectable forms due to sustained release.

Clearance

Estradiol valerate is primarily cleared through the liver with metabolites excreted in the urine. The clearance rate depends on liver function and individual metabolism.

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