Duphaston (Dydrogesterone)

Duphaston (Dydrogesterone): Patient-Friendly Medicine Information

Basic Product Information

• International Non-proprietary Name (INN): Dydrogesterone
• Brand Name in Australia: Duphaston
• ATC code: G03DB01
• Available Dosage Forms and Strengths:
  • Tablets: 10 mg
• Manufacturer: Abbott Laboratories and authorised local distributors
• Prescription Status: Prescription Only Medicine (Schedule 4, S4)

How Duphaston Works (Mechanism of Action)

For Patients: Duphaston contains dydrogesterone, a special form of the hormone progesterone. In many gynaecological conditions, the body needs a balanced supply of both oestrogen and progesterone. Dydrogesterone helps by supplementing your progesterone levels, supporting regular menstrual cycles, managing fertility problems, and helping prevent miscarriage in some women.

For Specialists: Dydrogesterone is a retroprogesterone with high oral bioavailability. It selectively binds to intracellular progesterone receptors, exerting progestogenic effects on the endometrium and counteracting the proliferative changes induced by oestrogen. Dydrogesterone does not exhibit androgenic, oestrogenic, or glucocorticoid activity, thereby minimising hormonal side effects.

Pharmacokinetics

• Absorption: Rapid and almost complete after oral administration; peak plasma levels achieved within 0.5–2.5 hours.
• Metabolism: Extensively metabolised in the liver, primarily to 20α-dihydrodydrogesterone (DHD).
• Elimination: Excreted mainly in urine, with 63% of dose eliminated within 24 hours.
• Duration of Effect: Active metabolites have a half-life averaging 5–7 hours; daily dosing maintains stable plasma levels.

Everyday Use and Best Practices in Australia

Duphaston is commonly prescribed within Australia for women needing progesterone support. Typical situations include irregular periods, endometriosis, prevention of miscarriage, infertility due to luteal insufficiency, and hormone replacement therapy (HRT). Always use Duphaston exactly as your doctor directs.

• Typical Doses: Usually 10 mg once or twice daily, depending on your condition.
• How to Take: Swallow the tablet with water at about the same time(s) each day.
• Missed Dose: If you forget a dose, take it as soon as you remember, unless nearly time for your next dose – in that case, skip it and resume as normal. Do not double up doses.
• Medical Follow-Up: Regular check-ups and sometimes blood tests may be needed to monitor your progress.

Dosing: Morning vs Evening

• Morning: Some patients prefer mornings for better adherence; may help minimise insomnia risk in sensitive individuals.
• Evening: For those experiencing mild drowsiness as a side effect, taking Duphaston in the evening may reduce daytime impact. However, use at consistent times daily for best results.
• Pharmacist Tip: Set a reminder on your phone to help maintain regularity.

Taking Duphaston: With Food or on an Empty Stomach

• Duphaston can be taken with or without food, as food does not significantly affect its absorption.
• For patients with sensitive stomachs, taking tablets with a meal or light snack may reduce mild nausea.
• Australian dietary preference: Integrating Duphaston into your breakfast or dinner routine may help regularity.

Interaction Warnings

Indications for Use

Dosing According to Indication

Safety Profile and Potential Side Effects

• Common: Mild headache, breast tenderness, slight nausea, mild drowsiness, menstrual spotting.
• Occasional: Skin rash, mild gastrointestinal discomfort.
• Rare: Severe allergic reactions (swelling, hives—seek immediate help), jaundice, significant mood changes.
• Warnings: Use with caution if you have severe liver impairment, unexplained vaginal bleeding, or a history of hormone-sensitive cancers. Consult your doctor for personal advice.
• Australian Note: Unlike some synthetic progestogens, dydrogesterone is not associated with increased risk of venous thromboembolism in HRT studies, but all hormone use should be individually assessed.

Guidelines for Proper Use

1. Always follow your doctor or pharmacist’s advice for timing and doses.
2. Store tablets in their original packaging at room temperature below 30°C, away from moisture and heat.
3. If you become pregnant or plan pregnancy consultation, notify your healthcare provider immediately.
4. Report any unexpected bleeding, persistent headaches, or severe side effects promptly.
5. Adhere to regular follow-up appointments and blood tests as recommended.
6. If planning to travel, carry sufficient medication and a prescription summary from your gp, especially when flying between Australia states or overseas.

Alternative Medicines and Treatment Options

• Other Progesterones:
  • Micronised Progesterone (e.g., Utrogestan): Natural hormone, effective in many indications; may cause drowsiness and must be taken with food for best absorption.
  • Medroxyprogesterone acetate (MPA): More traditional, sometimes more side effects (e.g., fluid retention, mood changes).
  • Norethisterone Acetate, Levonorgestrel: Synthetic options used in HRT and menstrual regulation, with slightly different side effect profiles.
• Non-hormonal Alternatives (for some indications): NSAIDs for period pain, contraceptive pills for cycle regulation (providing both oestrogen and progestogen), or IUDs (e.g., Mirena).
• Comparison:
  • Dydrogesterone has fewer androgenic/weight-related effects than some older progestins.
  • Micronised progesterone is sometimes preferred for endometrial protection during HRT because of its safety in cardiovascular and breast cancer risk studies.

Legal, Registration, and Reimbursement Information

• Duphaston (dydrogesterone) is registered as a Prescription Only Medicine in Australia (ARTG inclusion required).
• Reimbursement: Not currently PBS-reimbursed (Pharmaceutical Benefits Scheme); patients pay privately.
• Importation/Availability: May be arranged via Australian pharmacy wholesalers or approved online pharmacies with valid prescription.
• Legal supply: Only available with a current Australian prescription; telehealth and face-to-face prescribers accepted.

Latest Research and Clinical Guidance (2022–2025)

• Recent consensus, such as Australian guidelines on management of threatened miscarriage (RCOG, 2023), support dydrogesterone’s use for luteal support, especially in those with proven deficiency or recurrent miscarriage.
• Prescribing is consistent with international standards (e.g., NICE, ESHRE 2022 update) and local adaptation.
• Comparative studies confirm dydrogesterone’s efficacy and low adverse effect profile versus other synthetic progestogens (See: Fertility & Sterility, 2024).

Availability and Delivery Information

• Available from major community and hospital pharmacies throughout Australia. Some may require special order.
• Home delivery and online ordering available with valid prescription.
• Some pack sizes unavailable in all regions—check with your pharmacist.

Frequently Asked Questions (FAQ)

1. Can I take Duphaston while breastfeeding?
   Duphaston has not been thoroughly studied in breastfeeding. It is not recommended unless your doctor advises that the benefits outweigh any risks. Always consult your healthcare provider for advice tailored to your situation.
2. What should I do if I miss a dose?
   Take the missed dose as soon as you remember. If it is nearly time for your next dose, skip the missed one and continue as scheduled. Do not take a double dose to make up.
3. Are there dietary restrictions while taking Duphaston?
   No special diet is needed. You may eat and drink as normal. However, discuss any herbal supplements or unusual diets with your pharmacist or GP.
4. Can I drink alcohol while using Duphaston?
   Moderate alcohol use does not directly interact with Duphaston, but excessive drinking is not advisable for your general health, especially if also taking other medicines.
5. Is Duphaston safe in long-term use?
   Duphaston is considered safe for most women when prescribed correctly. Long-term use should always be regularly reviewed by your doctor, especially if used as part of HRT or for gynaecological conditions.

References

• Australian Medicines Handbook (AMH) 2024, Section: Progestogens.
• Therapeutic Goods Administration (TGA), ARTG Public Summary for Duphaston.
• Australian Menopause Society, HRT prescribing guidelines 2023.
• Practice Bulletin No. 212: The Role of Progestogens in Obstetrics and Gynaecology. Obstet Gynecol. 2022.