Duphaston (Dydrogesterone) – Patient-Friendly Guide (UK)

Duphaston contains dydrogesterone, a man-made form of the hormone progesterone. It is used to treat a range of hormone-related conditions, particularly those where a doctor wants to support the lining of the womb (endometrium) and help regulate the menstrual cycle.

This guide explains how Duphaston works, when it’s typically taken, and what to expect. It also covers safety information, practical tips for use, possible interactions, and frequently asked questions.

1) Basic product information

Medicinal product: Duphaston

Active ingredient: Dydrogesterone

Hormone type: Progestogen (progestin)

Form: Tablets (strengths may vary by presentation)

Who it’s for: People who require progesterone support for specific gynaecological conditions, as advised by a healthcare professional

Note: Always check the specific strength and instructions on your pack. If you are unsure, speak to a pharmacist.

2) What does Duphaston do? (Mechanism of action)

Duphaston is designed to act like progesterone in the body. Its main actions include:

• Stabilising the endometrium: It helps prepare and maintain the uterine lining for a healthier menstrual cycle and, where relevant, for early pregnancy support.
• Counteracting oestrogen effects: If the body has oestrogen activity without adequate progesterone balance, the endometrium may become overly thick. Dydrogesterone helps reduce the risk associated with unopposed oestrogen.
• Supporting hormone rhythm: Depending on the condition, it may help regulate bleeding patterns and symptoms.
• Reduced androgenic effects: Dydrogesterone is structured to have minimal androgenic activity compared with some other progestogens.

In short, Duphaston provides progesterone-type support that helps correct hormone imbalance related to the womb and menstrual cycle.

3) Pharmacokinetics (How the body handles it)

Pharmacokinetics describes what the body does to the medicine—how it’s absorbed, processed, and removed.

• Absorption: Dydrogesterone is absorbed after oral dosing and converted in the body primarily to its active metabolite.
• Metabolism: The medicine is metabolised mainly in the liver.
• Active metabolite: The key metabolite is dihydrodydrogesterone, which contributes to its progestogenic effect.
• Elimination: Metabolites are excreted mostly via the urine.
• Duration of effect: Effects last long enough to allow once or twice daily schedules depending on the indication and regimen.

Individual responses can vary. Your schedule should follow the dosing instructions provided with your specific plan.

4) Typical uses in the UK

Duphaston is used for hormone-related conditions where progesterone support is beneficial. Typical indications may include:

• Irregular or abnormal uterine bleeding caused by hormonal imbalance
• Premenstrual-type symptoms related to progesterone deficiency (where appropriate)
• Endometriosis (to help manage endometrial tissue outside the womb)
• Support in certain cases of threatened miscarriage or recurrent miscarriage related to progesterone deficiency (this depends on local clinical guidance and individual assessment)
• Assisted reproduction support in selected circumstances
• Hormone replacement therapy (HRT) regimens to provide endometrial protection when oestrogen is used (so that the uterine lining is appropriately supported)
• Dysmenorrhoea (painful periods) where hormonal support is considered

Important: The exact indication and dosing regimen must be matched to the person’s condition, history, and bleeding pattern.

5) Timing and how to take Duphaston

Many progestogens work best when taken at consistent times. Duphaston schedules vary, but general practical guidance includes:

• Take it regularly: Try to take your tablets at the same times each day.
• With or without food: Dydrogesterone can generally be taken with water and may be taken with or without food, depending on your tolerance.
• Follow your cycle timing: If your treatment relates to menstrual timing, you may be instructed to start on a specific day of your cycle.
• Do not double up: If you miss a dose, follow the advice on the patient leaflet or from your pharmacist. Avoid taking extra tablets unless specifically instructed.

Practical tip: Setting a daily alarm or using a pill organiser can help you stay consistent, which is especially helpful for regimens tied to cycle days.

6) Food interactions

Food may affect how quickly some medicines are absorbed, but dydrogesterone is generally considered suitable for use with or without food.

• If it upsets your stomach: Consider taking it with a meal or snack.
• Maintain consistency: Try to take it the same way each day to help you monitor any side effects.

If you have significant gastrointestinal sensitivity, ask your pharmacist for personalised advice on taking it.

7) Alcohol and medicine interactions

There is no universally required rule that avoids alcohol completely with dydrogesterone. However, both alcohol and hormones can influence symptoms such as mood, sleep, and nausea in some people.

• Moderation is sensible: If you choose to drink alcohol, do so in moderation.
• Watch for side effects: If you notice dizziness, headache, or stomach upset after alcohol, consider avoiding it around your dose.
• Medication balance matters: Alcohol can interact indirectly by affecting liver metabolism and overall health.

Other medicines: Tell your pharmacist or prescriber about all medicines you take, including herbal products and supplements. This helps assess interactions, especially with medicines that affect liver enzymes.

8) Indications: when Duphaston may be used

The wording of indications can vary depending on the product licence and clinical judgement. In the UK, dydrogesterone may be used for progestogenic support including:

• Hormonal imbalance affecting menstrual bleeding
• Endometriosis
• Dysmenorrhoea (period pain)
• Premenstrual symptoms where progesterone deficiency is suspected
• Avoiding endometrial overgrowth in hormone replacement therapy when oestrogen is used
• Threatened miscarriage and recurrent miscarriage cases where progesterone support is considered appropriate
• Support in fertility treatment where prescribed

Because hormone treatment is individual, your dosing and duration should be tailored to your condition and response.

9) Dosing information (general guidance)

Dosing depends on the indication. Always follow the regimen given by your healthcare professional and the instructions provided on your medicine pack.

Common dosing patterns (illustrative examples): Regimens often involve taking tablets once or twice daily and may be linked to a cycle schedule (e.g., certain days each month). For HRT, dosing schedules may differ based on whether oestrogen is given continuously or cyclically.

Typical approach:

• Conditions relating to the menstrual cycle: Treatment may be started on a specific day of your cycle and taken for a defined number of days.
• Longer-term conditions: The duration may extend over several cycles and will be reviewed based on symptoms and bleeding patterns.
• HRT regimens: Dydrogesterone is often taken to protect the uterine lining while oestrogen is used.

Important: Do not change the dose or stop early without advice—stopping progesterone support suddenly can affect bleeding and symptoms.

10) Safety profile and side effects

Like all medicines, Duphaston can cause side effects. Not everyone will experience them. Many side effects are mild and may improve over time.

Commonly reported side effects

• Headache
• Nausea or mild stomach upset
• Breast tenderness
• Mild dizziness in some people
• Changes in bleeding (e.g., spotting) especially early in treatment

Less common but important symptoms

Seek prompt medical advice if you experience any signs of serious allergy or other urgent conditions, such as:

• Swelling of the face, lips, tongue, or throat
• Rash with itching or widespread hives
• Breathing difficulties
• Severe or persistent abdominal pain

Seek urgent help if you suspect complications

Contact urgent care or emergency services if you develop symptoms suggestive of blood clots or stroke, such as:

• Sudden shortness of breath
• Chest pain
• One-sided weakness or facial drooping
• Severe leg pain or swelling

Although the risk profile of different progestogens varies, any new concerning symptoms should be evaluated immediately.

Who should be extra cautious

• People with a history of certain blood disorders or clotting conditions
• Those with severe liver problems
• Anyone with a history of hormone-sensitive cancers (treatment decisions are individual)
• People with unexplained vaginal bleeding that has not yet been assessed

Always discuss your medical history with a healthcare professional before starting or continuing treatment.

11) Practical use tips

• Use a reminder system: A phone alarm or pill organiser helps prevent missed doses.
• Track symptoms: Keep a simple diary of bleeding changes, pain levels, or other symptoms—this helps your clinician adjust treatment if needed.
• Know your cycle days: If your regimen depends on cycle timing, mark the start day clearly.
• Don’t stop abruptly: If you’re using Duphaston as part of a planned course, follow the plan unless told otherwise.
• Check packaging: Confirm the tablet strength and daily instructions each time you refill.
• Keep follow-up appointments: Hormone treatments are usually reviewed to ensure benefits continue and side effects are manageable.

12) Alternative options

Depending on the condition, other therapies may be considered. Alternatives can include:

• Other progesterone/progestogen medicines: Some conditions may be treated with different progestogens (options vary by indication and suitability).
• Oestrogen–progestogen combinations (for HRT): In some people, combined regimens may be used to simplify dosing.
• Non-hormonal options: For some symptoms (e.g., certain types of menstrual pain), pain management strategies or other non-hormonal treatments may be appropriate.
• Specialist treatments for endometriosis: Depending on severity, other medical approaches may be recommended.
• Lifestyle and symptom support: Although not a replacement for prescribed hormone therapy when needed, supportive measures may help overall comfort.

Your best alternative depends on your diagnosis, age, medical history, and the goals of treatment (e.g., symptom relief, bleeding regulation, or endometrial protection).

13) Market and legal context (UK)

In the UK, dydrogesterone-containing medicines are regulated and supplied according to national requirements. The availability of Duphaston may depend on:

• Licensed indications: Duphaston is authorised for specific uses; prescribing and supply should align with these.
• Safety information requirements: Patient leaflets and healthcare professional guidance are part of safe medicine use.
• Pharmacy regulations: Medicines must be supplied under relevant UK pharmacy and controlled medicine rules where applicable.

Recent guidance and evidence updates: Hormone treatments—especially in early pregnancy support and recurrent miscarriage—are an area where clinical practice can evolve. Guidance may be updated as new evidence emerges and as bodies such as the NHS and relevant specialty groups review data. Your clinician or pharmacist can advise on the most current approach for your individual situation.

14) Recent guidance (how to stay up to date)

For UK patients, hormone treatment plans are typically reviewed using current clinical recommendations and updated safety information. If you’re taking Duphaston for a condition where evidence has been actively studied (such as miscarriage support), it’s reasonable to:

• Ask your clinician: whether your regimen matches the latest approach for your diagnosis.
• Check your medicine leaflet: for the most up-to-date safety warnings and dosing instructions.
• Report new symptoms promptly: which helps your healthcare team reassess risk and benefit.

This website information is intended to support understanding, not replace individual medical advice.

15) Delivery and availability in the UK

Availability can vary by strength, pack size, and local supply. Online pharmacy services commonly offer:

• Home delivery: Options typically include standard or expedited delivery depending on the provider and region.
• Packaging: Medicines are usually supplied in secure, tamper-evident packaging.
• Stock updates: Many pharmacies update availability in real time, particularly during periods of high demand.

Delivery tips:

• Ensure someone can receive the parcel if you’re not home.
• Check that your address and contact details are correct at checkout.
• Store tablets according to the pack instructions (typically at room temperature, away from moisture and direct sunlight).

16) Storage

Follow the storage instructions on the carton or patient leaflet. In general:

• Keep tablets in the original packaging.
• Store away from heat, moisture, and direct sunlight.
• Keep out of sight and reach of children.

17) FAQ

What is Duphaston used for?

Duphaston is used for hormone-related gynaecological conditions where progesterone support is helpful. It may be used to support the uterine lining, help regulate bleeding, treat endometriosis, and provide endometrial protection in hormone replacement therapy, depending on your diagnosis.

How long does it take to work?

Some effects, such as changes in bleeding pattern or menstrual-related symptoms, may be noticed within days to a few cycles. Others may take longer. Your clinician will advise what timeline to expect for your specific condition.

Can I take Duphaston with food?

It is generally possible to take dydrogesterone with or without food. If it upsets your stomach, taking it with a meal may help.

What if I miss a dose?

Follow the guidance in the patient information leaflet or the advice given by your pharmacist. In general, it’s best not to take double doses unless specifically instructed.

Can I drink alcohol while taking Duphaston?

Moderate alcohol intake is not automatically forbidden, but alcohol can worsen nausea or make symptoms feel less predictable in some people. If alcohol affects you, consider avoiding it around your dose and discuss with a pharmacist if you’re unsure.

Are there any medicine interactions I should know about?

Tell your pharmacist about all medicines and supplements you use. Certain medicines that affect liver enzymes may influence hormone medicine levels. A professional can check your specific combination for interactions.

Is Duphaston safe in pregnancy?

Duphaston is sometimes used in specific pregnancy-related scenarios under medical guidance. If you are pregnant, trying to conceive, or become pregnant while taking Duphaston, discuss your situation promptly with your healthcare professional to ensure the plan remains appropriate.

What side effects are common?

Commonly reported side effects include headache, nausea, breast tenderness, and changes in bleeding. If side effects are severe or you develop concerning symptoms, seek medical advice.

When should I stop taking it?

Do not stop or change dose without advice. If you’re experiencing troubling side effects or have new symptoms, contact your pharmacist or clinician to discuss whether your treatment needs adjustment.

Is Duphaston the only progesterone option?

No. Depending on your condition, other progesterones or progestogens (and sometimes non-hormonal options) may be considered. Your clinician can recommend the most suitable alternative for your situation.

18) Summary

Duphaston (dydrogesterone) is a progesterone-type medicine used to support the uterine lining and treat several hormone-related conditions. Taking it at consistent times and following a plan tailored to your symptoms and cycle can help achieve the intended benefit. If you have questions about timing, missed doses, interactions, or side effects, speak to a pharmacist—especially if you have a complex medical history or are taking multiple medicines.

Disclaimer: This information is for patient understanding and should not replace professional medical advice. Always refer to the patient leaflet supplied with your medicine for the most accurate guidance for your pack.