Estradiol Tablets (Julina) is a prescription drug containing estrogen, mainly used to relieve menopausal symptoms, treat osteoporosis, and regulate endometrial conditions in assisted reproductive technology.

I. What is Estradiol Tablets (Julina)?

1. Main Ingredients and Indications

The main active ingredient of Estradiol Tablets is estradiol, a natural estrogen. It is indicated for the following conditions:

(1) Menopausal symptoms: such as hot flashes, sweating, vaginal atrophy, etc.

(2) Osteoporosis: for preventing bone loss in postmenopausal women.

(3) Assisted reproduction: for timing ovarian stimulation or preparing the endometrium for frozen-thawed embryo transfer.

2. Dosage Form and Strength

This drug is a film‑coated tablet, containing 0.5 mg of estradiol per tablet. It is light grayish-yellow, round, with a diameter of 6 mm, and suitable for oral administration.

II. Mechanism of Action of Estradiol Tablets

1. Supplementing endogenous estrogen

After oral administration, estradiol is rapidly absorbed, increasing the concentration of estrogen in the blood, thereby relieving various symptoms caused by decreased estrogen levels, such as hot flashes and sweating.

2. Inhibiting bone resorption and protecting bones

(1) In postmenopausal women, estrogen deficiency leads to accelerated bone resorption and reduced bone mineral density.

(2) Estradiol effectively inhibits bone resorption, slows bone loss, and reduces the risk of fractures.

3. Regulating the endometrium

(1) In assisted reproductive treatment, estradiol promotes endometrial thickening and creates favorable conditions for embryo implantation.

(2) Combined with progestogens, it can simulate the natural cycle and help regulate the timing of ovulation.

III. Drug Interactions

1. Drugs that may potentiate the effect

Certain drugs inhibit enzymes that metabolize estradiol in the liver (e.g., CYP3A4), leading to elevated blood concentrations of estradiol and potentially increased risk of side effects. Such drugs include:

(1) Some antifungal agents (e.g., ketoconazole, itraconazole).

(2) Some antibiotics (e.g., erythromycin).

2. Drugs that may reduce the effect

Some drugs induce hepatic enzyme activity, accelerate estradiol metabolism, and reduce its efficacy, such as:

rifampicin, barbiturates, antiepileptics (e.g., carbamazepine), and health products containing St. John’s Wort.

3. Interactions with HIV medications

Some HIV protease inhibitors may also affect estradiol metabolism; use under medical supervision is required.

IV. Precautions During Administration

1. Contraindications

Estradiol Tablets are contraindicated in:

(1) Known or suspected estrogen‑dependent tumors (e.g., breast cancer, endometrial cancer).

(2) Patients with a history of thrombosis or severe liver disease.

(3) Pregnant or lactating women.

(4) Abnormal uterine bleeding of undetermined cause.

2. Necessary examinations before use

A thorough physical examination should be performed before treatment, including breast examination, gynecological examination, and endometrial thickness measurement, to ensure no contraindications exist.