Dydrogesterone (Duphaston® and Other Brands) – Patient-Friendly Guide (Australia)

Dydrogesterone is a synthetic form of the naturally occurring hormone progesterone. In Australia, dydrogesterone is used to support hormone balance in a range of gynaecological conditions, most commonly in situations where progesterone is needed to protect the uterine lining (endometrium) and help regulate bleeding patterns.

This guide explains how dydrogesterone works, how it’s taken, typical uses, what to expect, and important safety information. It’s written for patient understanding and is not a substitute for personal medical advice.

Basic product information

How dydrogesterone works (mechanism of action)

Dydrogesterone is a progestogen. Its role in the body is closely linked to progesterone’s effects on the reproductive system.

• Protects the endometrium (uterine lining): When oestrogen stimulates the uterine lining, dydrogesterone helps prevent excessive thickening, which can increase the risk of abnormal growth.
• Supports normal menstrual cycles: It helps organise the endometrium into a stable, secretory pattern and may improve predictable bleeding.
• Maintains hormonal balance in the uterus: By acting on progesterone receptors, it can reduce abnormal bleeding caused by hormonal imbalance.
• Supports certain hormone therapies: In menopausal hormone therapy, dydrogesterone is used alongside oestrogen where the uterus is still present.

Important: The exact reason you’re taking dydrogesterone (and the dosing schedule) depends on your condition—such as abnormal uterine bleeding, endometriosis support, or oestrogen-associated protection.

Pharmacokinetics (how the body processes it)

Pharmacokinetics describes what happens to the medicine after you take it—absorption, metabolism, distribution, and elimination.

• Absorption: Dydrogesterone is generally absorbed after oral dosing.
• Metabolism: It is metabolised in the liver, primarily forming a major active metabolite (notably dihydrodydrogesterone).
• Half-life: The elimination half-life is approximately 5–7 hours for dydrogesterone itself, with the active metabolite persisting longer, supporting the dosing schedule.
• Excretion: Metabolites are mainly eliminated via urine.
• Effect duration: While dosing schedules vary by indication, the biological effects extend beyond the immediate presence of the drug, supporting cyclical regimens.

Because individual factors (such as age, liver function, and other medicines) can influence metabolism, your clinician may adjust your regimen if needed.

Typical uses of dydrogesterone

Dydrogesterone is used to treat or help manage hormone-related conditions affecting the reproductive system. Common indications include:

• Hormone replacement therapy (HRT) with an intact uterus: To protect the endometrium when oestrogen is used.
• Abnormal uterine bleeding related to progesterone deficiency or hormonal imbalance (for example, irregular bleeding or “breakthrough” bleeding).
• Functional uterine bleeding patterns where progesterone support helps regulate the endometrium.
• Endometriosis: Progestogen therapy may reduce symptoms such as pelvic pain and help stabilise endometrial-like tissue.
• Premenstrual-related symptoms in some cases where progesterone support is considered.
• Reproductive hormone support in carefully selected situations under medical guidance (the exact circumstances vary).

Note: Exact approved indications and wording can vary by product and regulatory updates. Always check the specific product information provided with the brand you receive.

When to take dydrogesterone (timing and schedule)

Timing is crucial. Your dosing schedule depends on the reason you’re taking the medicine.

• Follow the recommended days and cycle: Many regimens are cyclical (e.g., certain days of the menstrual cycle).
• Try to take it consistently: Choose a time of day that helps you remember—often morning or evening.
• With or without food: Dydrogesterone can usually be taken with water and may be taken regardless of meals (see food interactions section below for details).

If you are unsure how to time your dose for your cycle, ask a pharmacist to walk you through it using your specific instructions.

Food interactions

Food effect: Dydrogesterone can generally be taken with or without food. Taking it with food may help if you experience mild stomach discomfort.

• For best tolerability: Consider taking with a meal or after food if it upsets your stomach.
• Consistency matters: Try to keep your routine similar each day to maintain consistent absorption.

Special note: Always review your brand’s product leaflet for any brand-specific instructions.

Alcohol and medicine interactions

Alcohol: Moderate alcohol use is not typically described as a direct interaction with dydrogesterone in standard references. However, alcohol can worsen side effects such as dizziness or nausea in some people.

• If you notice dizziness, headache, or nausea after taking dydrogesterone, consider reducing alcohol and speak to a pharmacist.
• Avoid heavy or binge drinking, which can affect hormone health and liver metabolism.

Medicine interactions (general): Some medicines can change how your liver metabolises hormones, potentially reducing effectiveness or changing side effects. Examples may include certain:

• Anticonvulsants (some seizure medicines)
• Antibiotics or medicines that affect liver enzymes
• Herbal preparations such as St John’s wort
• Some HIV or tuberculosis medicines (enzyme inducers)

Provide your pharmacist with a full list of medicines and supplements so potential interactions can be assessed.

Indications (what it treats)

Dydrogesterone is prescribed for women’s health conditions where progesterone effects are beneficial. The exact indications can vary by Australian product information and the regulatory status of each brand.

Commonly, dydrogesterone is used for:

• Hormonal imbalance causing abnormal bleeding or inadequate luteal-phase support.
• Endometriosis to help manage symptoms by stabilising hormone-responsive tissue.
• Oestrogen therapy support in menopausal hormone treatment for women with an intact uterus, to reduce risk of endometrial overgrowth.

Not for everyone: Your doctor will consider contraindications such as certain hormone-sensitive conditions and risk factors (for example, a history of specific types of blood clots or some liver disorders).

Dosing (how much to take)

Dosing depends strongly on the reason you’re taking dydrogesterone, your age, and whether you’re using it as part of HRT or for cycle-related symptoms.

General principles:

• Use the dose written on your product label or provided by your clinician.
• Do not change the dose or stop early without medical advice, particularly when used for bleeding control or as part of hormone therapy.
• Take at the same time each day if your regimen is daily.

Typical example regimens (illustrative only): Many dydrogesterone regimens involve cyclical use (e.g., for a portion of the menstrual cycle) or continuous use when paired with oestrogen. Because the correct schedule depends on your condition, always follow your specific instructions.

• Oestrogen-associated endometrial protection (HRT): Dydrogesterone is taken for part of the cycle alongside oestrogen; the exact number of days depends on your oestrogen regimen.
• Abnormal uterine bleeding: Dydrogesterone may be given for a limited number of days each cycle, then reviewed based on response.
• Endometriosis: Progestogen therapy is often taken regularly for several months, with symptom review over time.

If you miss a dose:

• Take it as soon as you remember if it’s close to the usual time.
• If it’s near the time of the next dose, skip the missed tablet and resume your schedule.
• Do not take a double dose unless your pharmacist advises otherwise.

Safety profile and when to seek help

Like all medicines, dydrogesterone can cause side effects. Many people tolerate it well, but some symptoms require medical review.

Common side effects

• Mild headache
• Nausea or stomach discomfort
• Breast tenderness or changes
• Mood changes
• Vaginal spotting or bleeding pattern changes (especially during the first cycles of use)

Serious side effects – seek urgent medical attention

Contact urgent care or emergency services if you develop symptoms that could suggest a serious condition. Examples include:

• Signs of blood clots: sudden shortness of breath, chest pain, coughing blood, severe leg pain or swelling, or sudden weakness/numbness on one side.
• Severe allergic reaction: swelling of the face/lips, trouble breathing, or widespread rash.
• Severe liver issues: yellowing of the skin/eyes, dark urine, severe fatigue, or persistent upper abdominal pain.

Who should be extra cautious

Your clinician should consider your medical history before starting dydrogesterone. Extra caution is needed if you have:

• Unexplained vaginal bleeding
• A history of hormone-sensitive cancers
• Risk factors for blood clots
• Significant liver disease
• Known hypersensitivity to progesterone-related medicines

Always inform your pharmacist or doctor about all conditions and medicines—especially if you’re switching from another hormone therapy.

Practical use tips

• Use a reminder system: Set a phone alarm or use a medication app to avoid missed doses.
• Track bleeding changes: If you’re taking it for abnormal bleeding, note your cycle dates and any spotting or flow changes. This helps your clinician evaluate effectiveness.
• Take consistently: If your regimen is cyclical, follow the “days of the cycle” instructions carefully.
• Keep your medication list updated: Include vitamins and herbal products—some supplements can affect liver enzymes or clot risk.
• Review side effects early: Mild side effects may settle after the first cycles, but persistent symptoms should be discussed.

Alternative options (depending on your condition)

There are several hormone-related treatments that may be considered alternatives to dydrogesterone. The best option depends on your diagnosis, preferences, risk profile, and other medicines.

Other progestogens

• Micronised progesterone
• Medroxyprogesterone (some formulations and schedules differ)
• Norethisterone or levonorgestrel (including some intrauterine systems)

Non-hormonal or supportive approaches

• For some menstrual-related issues, clinicians may consider non-hormonal symptom control depending on the cause.
• For endometriosis, options can include other hormonal regimens, pain management strategies, and surgical review in certain cases.

Important: Alternatives are not interchangeable. Doses, timing, and safety profiles differ—so any switch should be guided by a healthcare professional.

Australia: market and legal context (what to expect)

In Australia, medicines are regulated under the Therapeutic Goods Administration (TGA). Product availability and purchase options depend on the medicine’s classification and the state/territory rules for dispensing and supply through pharmacies.

• Pharmacy supply: Dydrogesterone is supplied through licensed channels, typically via pharmacies.
• Online pharmacy: If you are ordering from an online pharmacy, the supplier may require appropriate clinical screening and identity verification to comply with Australian medicines law.
• Safety checks: Pharmacists can review your medication list and history to reduce the risk of interactions and inappropriate use.

Recent guidance and product updates: Health guidance can evolve based on new evidence, changes in prescribing information, and safety communications. Always check the most recent consumer medicine information (CMI) leaflet included with your brand and consult your pharmacist if you have questions.

Delivery and availability (online pharmacy)

Availability can vary by brand and strength. When you order online, you may receive either the brand you selected or an equivalent generic product if permitted by supply arrangements.

• Stock status: Items may be listed in stock or on backorder depending on demand.
• Packaging: Medicines are supplied in manufacturer packaging with labels and consumer information.
• Delivery timeframes: Delivery times depend on location and courier service. Delays can occur during high-demand periods.
• Storage: Store tablets according to the instructions on the pack (typically at room temperature, away from moisture and heat).

If you’re travelling or require urgent timing for cycle management, consider ordering with enough lead time and confirm dispatch and delivery estimates before placing your order.

FAQ – Dydrogesterone

1) What is dydrogesterone used for?

Dydrogesterone is used to treat conditions where progesterone support is beneficial, such as hormone-related abnormal uterine bleeding, endometriosis support, and to protect the uterine lining when oestrogen is used in hormone therapy for women who still have a uterus.

2) When will I notice it working?

Some people notice changes in bleeding patterns within the first cycle of treatment, while others may need a few months to fully evaluate response—especially for endometriosis-related symptoms.

3) Can I take dydrogesterone with food?

Yes, it can usually be taken with or without food. Taking it with food may help if you experience mild nausea.

4) What should I do if I miss a dose?

Take the missed dose as soon as you remember if it’s close to the usual time. If it’s almost time for the next dose, skip the missed dose and continue as normal. Do not take a double dose unless advised by a pharmacist.

5) Can I drink alcohol while taking it?

There is no common direct interaction described with moderate alcohol, but alcohol may worsen side effects like dizziness or nausea. If you notice you feel unwell after combining them, reduce alcohol and consult a pharmacist.

6) Are there medicines or supplements I should avoid?

Yes, some medicines can affect liver metabolism or hormone balance. Inform your pharmacist about all medicines, including herbal supplements (such as St John’s wort), vitamins, and over-the-counter products.

7) Is dydrogesterone safe in all women?

No. It may not be suitable for everyone, particularly those with certain medical histories such as unexplained vaginal bleeding, some hormone-sensitive cancers, significant liver disease, or a high risk of blood clots. Your clinician will assess suitability.

8) Can I stop dydrogesterone suddenly?

Stopping without advice may affect bleeding patterns and hormonal balance. If you want to stop or change treatment, discuss this with your clinician or pharmacist.

9) Does dydrogesterone affect driving or operating machinery?

Some people report mild side effects such as headache or dizziness. If you feel unwell, avoid driving or operating machinery until you know how the medicine affects you.

10) How long is treatment usually continued?

Treatment length varies by indication. Some conditions use cyclical schedules for a set number of cycles, while others require longer periods with periodic review.

Summary

Dydrogesterone is a progesterone-like medicine used in women’s health to manage hormone-related problems such as abnormal uterine bleeding, to support conditions like endometriosis, and to protect the uterine lining during oestrogen therapy when the uterus is present. It works by stabilising the endometrium and supporting hormone balance.

For best results, take dydrogesterone exactly as scheduled, keep track of cycle and bleeding changes if relevant, and seek advice if you experience concerning symptoms—especially signs of serious allergic reactions, blood clots, or liver problems.

If you have questions about your dosing timetable, interactions with other medicines, or delivery timing, a pharmacist can help you plan safely.