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Dydrogesterone

Dydrogesterone: Generic Medication Overview

Dydrogesterone is a synthetic progestogen used in women's health to support the body’s natural progesterone functions. This article covers Dydrogesterone, available as a generic medication and marketed under brand names such as Duphaston and Diferro. It is supplied as a 10 mg oral pill and is prescribed under the authority of the Hong Kong Department of Health.

How Dydrogesterone Works in the Body

Dydrogesterone mimics the activity of natural progesterone, a hormone essential for regulating the menstrual cycle and preparing the uterine lining for implantation. After oral administration, the drug is absorbed rapidly, reaching peak plasma concentrations within 2-4 hours. It binds to progesterone receptors in the uterus, stabilizing the endometrium and reducing uterine contractility. By supporting the luteal phase, it helps maintain early pregnancy and alleviates menstrual irregularities. Metabolism occurs primarily via the cytochrome P450 3A4 enzyme, and metabolites are excreted in the urine.

Conditions Treated by Dydrogesterone

• Luteal Phase Support in assisted reproductive technologies (e.g., in vitro fertilisation)
• Management of Threatened or Recurrent Miscarriage when progesterone deficiency is suspected
• Treatment of Menstrual Disorders such as irregular cycles, amenorrhoea, and heavy menstrual bleeding
• Endometriosis-Related Pain by inducing a pseudo-pregnancy state that suppresses ectopic endometrial growth
• Secondary Amenorrhoea associated with hypothalamic-pituitary dysfunction

These indications are approved by the Hong Kong Department of Health and reflected in the product’s prescribing information. Dydrogesterone is typically prescribed for adult women of reproductive age; use in adolescents or post-menopausal women is uncommon and should be evaluated by a specialist.

Patient Suitability and Contraindications

Who Should Use Dydrogesterone?

• Women with confirmed progesterone deficiency requiring hormonal support
• Patients undergoing fertility treatments who need luteal phase supplementation
• Individuals with documented menstrual cycle irregularities not attributable to other causes

Absolute Contraindications

• Known hypersensitivity to dydrogesterone or any excipients in the pill
• Active or a history of thromboembolic disorders (deep-vein thrombosis, pulmonary embolism)
• Unexplained vaginal bleeding of unknown origin

Relative Contraindications

• Pregnancy beyond the first trimester (use only when clearly indicated)
• Severe hepatic impairment (dose adjustment may be required)
• Concurrent use of strong CYP3A4 inducers (e.g., rifampicin, carbamazepine) that could lower dydrogesterone plasma levels

Special populations such as pregnant or lactating women should discuss potential benefits and risks with their obstetrician. The medication is not indicated for children.

Safety Profile: Side Effects and Interactions

Common Side Effects

• Nausea or mild gastrointestinal upset - usually transient and resolves without intervention.
• Breast tenderness - often diminishes after the first few days of therapy.
• Headache - may be relieved with simple analgesics if needed.

Serious Adverse Events

• Venous thromboembolism - rare but requires immediate medical attention if leg swelling, pain, or shortness of breath occurs.
• Severe allergic reactions (e.g., rash, itching, swelling) - discontinue the medication and seek urgent care.

Drug Interactions

• CYP3A4 Inhibitors (e.g., ketoconazole, erythromycin) may increase dydrogesterone concentrations, potentially enhancing side effects.
• CYP3A4 Inducers (e.g., phenytoin, St. John’s wort) can reduce therapeutic effectiveness.
• Anticoagulants such as warfarin may require closer INR monitoring due to possible pro-coagulant effects of progestogens.

Food and Lifestyle Interactions

• Dydrogesterone can be taken with or without food; however, a high-fat meal may slightly delay absorption.
• Moderate alcohol consumption does not appear to alter efficacy, but excessive intake should be avoided.
• No known impairment of driving or operating machinery has been reported.

Patients should inform all prescribers of concomitant medications, herbal supplements, and over-the-counter products.

How to Take Dydrogesterone

• Standard dosing: One 10 mg pill taken orally once daily, usually in the evening to mimic the natural progesterone surge.
• Condition-specific regimens: Some clinicians may prescribe 10 mg twice daily for severe menstrual disorders; dosing must be individualized.
• Administration: Swallow the pill whole with a glass of water. Do not crush or split the tablet unless instructed.
• Missed dose: Take the missed pill as soon as remembered on the same day; do not double the next dose.
• Overdose: Symptoms may include severe nausea, vomiting, and dizziness. Seek emergency care; there is no specific antidote, and treatment is supportive.
• Discontinuation: Abrupt cessation is generally safe, but for long-term luteal support, a gradual taper may be recommended by the prescriber to avoid withdrawal bleeding.

Monitoring and Follow-Up

Routine follow-up includes:

• Clinical assessment of menstrual pattern or pregnancy status after 2-3 weeks of therapy.
• Laboratory monitoring of liver function tests in patients with known hepatic impairment or those on interacting medications.
• Thrombotic risk evaluation for women with a personal or family history of clotting disorders.

If any new or worsening symptoms develop, patients should seek prompt evaluation.

Storage and Handling

• Store at room temperature (15 °C-30 °C), away from direct sunlight and moisture.
• Keep the bottle tightly closed and out of reach of children.
• Do not use the medication after the printed expiry date.
• Unused pills may be returned to a pharmacy for safe disposal; do not flush them down the toilet.

Medication-Specific Glossary

Progesterone Receptor

A cellular protein that binds progesterone and mediates its biological effects on the uterus and other tissues.

Luteal Phase

The post-ovulatory segment of the menstrual cycle during which progesterone prepares the endometrium for possible implantation.

CYP3A4

An enzyme in the liver that metabolises many drugs, including dydrogesterone; its activity can be altered by other substances.

Medical Disclaimer

This article provides educational information about dydrogesterone and is not a substitute for professional medical advice. Treatment decisions, including the use of unapproved indications, must be made under the guidance of a qualified healthcare provider. The content is intended for informational purposes and does not constitute medical recommendations. Always consult a physician before starting, stopping, or changing any medication regimen.