Dydrogesterone (Dydrogesterone) — Patient Information for the UK

Dydrogesterone is a medicine used to treat conditions related to insufficient progesterone activity in the body. It is commonly prescribed in women to support healthy endometrial (uterine lining) function during different stages of the reproductive cycle, including when using hormone therapy.

This guide explains what dydrogesterone is, how it works, how it behaves in the body, typical uses, how to take it, and important safety information. It is written for patients in the United Kingdom and uses patient-friendly language.

1) Basic product information

Important: Product presentations (strength, number of tablets, and dosing schedule) can vary. Always follow the specific directions given with your particular brand and strength.

2) What is dydrogesterone?

Dydrogesterone is a synthetic (man-made) hormone that acts as a progestogen. Progestogens help regulate the growth and stability of the uterine lining and support normal hormone balance during the menstrual cycle and pregnancy.

Unlike some other progestogens, dydrogesterone is designed to have a progesterone-like effect on the endometrium, helping reduce irregular bleeding caused by hormone imbalance.

3) Mechanism of action (how it works)

To understand how dydrogesterone helps, it’s useful to know what progesterone normally does:

• Supports the endometrium: Progesterone stabilises the uterine lining after ovulation.
• Reduces excessive or irregular bleeding: By transforming the endometrium into a stable, secretory state, it can reduce spotting and heavy or abnormal bleeding related to low progesterone activity.
• Helps in hormone replacement therapy (HRT): When oestrogen is used alone, it can stimulate the lining. Progestogens protect the uterus by preventing overgrowth.

Dydrogesterone’s main action is to provide progesterone activity in situations where natural progesterone is inadequate.

4) Pharmacokinetics (what the body does to the medicine)

Pharmacokinetics describes how dydrogesterone is absorbed, processed, and removed by the body.

• Absorption: Dydrogesterone is absorbed after oral dosing. Blood levels rise within hours.
• Metabolism: It is extensively metabolised in the liver. The key active metabolite is 20α-dihydrodydrogesterone (often described as dydrogesterone’s main metabolite), which contributes to overall progestogenic effect.
• Excretion: Metabolites are primarily eliminated via the urine.
• Half-life: The terminal elimination half-life is approximately several hours for the parent drug, with overall effects linked to metabolite formation and persistence.

These characteristics support dosing schedules that are typically taken once or more times daily depending on the condition being treated.

5) Typical uses and indications in the UK

Dydrogesterone is used for conditions where progesterone activity is needed to support the uterine lining or help control symptoms. Common indications include:

• Abnormal uterine bleeding related to progesterone deficiency (e.g., irregular, breakthrough, or heavy bleeding where appropriate).
• Endometriosis (to help manage symptoms and reduce endometrial-like tissue activity).
• Threatened or recurrent miscarriage associated with progesterone insufficiency (where clinically indicated).
• Premenstrual-related symptoms linked to progesterone imbalance (depending on local prescribing practice and guidance).
• Support during fertility treatment in certain circumstances (as directed by a specialist team).
• Hormone replacement therapy (HRT) needs: combined with oestrogen therapy to protect the uterus in postmenopausal women who have a uterus.

Note: Indications and the exact dosing regimen can vary by country guidance, product licence, and clinical judgement. Always check your specific patient leaflet and follow your prescriber’s plan.

6) When and how to take dydrogesterone (timing)

Taking your medicine at the right time helps maintain steady hormone levels and supports predictable effects.

• Follow your schedule: If your regimen is once daily, try to take it at the same time each day.
• If more than once daily: Space doses evenly across the day where possible.
• Do not skip doses: Missing doses may reduce effectiveness, especially in conditions where consistent progestogenic support is important.
• If you’re unsure: Refer to your leaflet or speak to a healthcare professional.

Tip: Use a phone alarm or pill organiser to help you stay on track.

7) Dosing overview (typical adult regimens)

Dosing depends on the condition being treated, your medical history, and the specific product strength. Below is a general overview of the kinds of dosing schedules commonly used.

Important: This is not a substitute for your individual prescription instructions. Always use the dose and duration described for your situation.

Because regimens vary, it’s safest to treat your leaflet or clinic plan as the authority. If you have questions, contact a healthcare professional or pharmacist.

8) Food interactions

Dydrogesterone can usually be taken with or without food. Most people do not need to change their diet.

• Swallowing: Take the tablet(s) with water.
• Consistency helps: If you choose to take it with food, keep doing so at the same time each day.

If your medicine leaflet includes specific instructions (e.g., take with meals), follow those.

9) Alcohol and medicine interactions

There is no universal rule that alcohol “must never” be taken with dydrogesterone, but alcohol can affect your body and hormone balance in ways that may worsen symptoms or increase side effects (such as dizziness or sleep disturbance).

• General advice: Limit alcohol and avoid binge drinking.
• Monitor how you feel: If alcohol makes you feel drowsy, dizzy, or unwell, avoid alcohol while taking the medicine.
• Other medicines: If you are taking additional medications (including antiemetics, sedatives, or medicines for anxiety), alcohol may increase the effects of those medicines.

If you’re unsure about your personal risk—especially if you’re pregnant, have liver issues, or are taking multiple medicines—ask a pharmacist.

10) Safety profile and side effects

Like all medicines, dydrogesterone can cause side effects. Many people experience none or only mild effects. Report persistent or concerning symptoms to a healthcare professional.

Common side effects (may occur)

• Headache
• Nausea or stomach discomfort
• Mood changes in some people
• Breast tenderness
• Vaginal spotting or changes in bleeding pattern, especially early in treatment

Serious or urgent symptoms (seek medical advice promptly)

Stop and get urgent medical help if you experience symptoms that may indicate a severe reaction or a potentially serious complication, such as:

• Signs of an allergic reaction: swelling of face/lips, rash with breathing difficulty
• Yellowing of the skin or eyes (jaundice), severe fatigue, or dark urine (possible liver problem)
• Severe chest pain, sudden breathlessness, coughing blood (possible blood clot symptoms)
• Severe headaches with vision changes or weakness
• Unexpected heavy bleeding or worsening severe pelvic pain

Risk note for HRT users: Progestogen-containing regimens are reviewed regularly because certain risks (such as thromboembolic events and breast-related risks) depend on age, personal history, dose, and duration.

Who should take extra care?

• People with liver disease or previous serious liver issues
• People with a history of hormone-sensitive cancers (needs specialist discussion)
• People with unexplained vaginal bleeding that hasn’t been assessed
• People with thromboembolic risk factors

11) Practical use tips (how to get the best results)

• Keep a bleeding or symptom diary: note timing, intensity, and any pain. This helps clinicians adjust therapy.
• Set reminders: progestogens often work best when taken consistently.
• Use a pill organiser: especially if taking more than one tablet daily.
• Don’t stop early without advice: stopping suddenly may affect bleeding control or symptom relief.
• Check for brand differences: tablet appearance and strength can differ between manufacturers.
• Attend regular reviews if you’re on HRT or longer-term therapy.

12) Alternative options

Depending on why you’re taking dydrogesterone, alternatives may include other progestogens or different treatment strategies.

Other progestogens (examples)

• Micronised progesterone (used in some fertility/pregnancy-support regimens)
• Medroxyprogesterone
• Norethisterone or other oral progestogens used for bleeding control or HRT
• Levonorgestrel-releasing intrauterine system (IUS) for endometrial protection in HRT in some situations
• Other hormonal options depending on diagnosis (for example, treatments for endometriosis may be adjusted to symptom control needs)

Your alternative depends on your diagnosis, tolerance, risk factors, and whether you have a uterus (important for endometrial protection when using oestrogen).

Discuss with a pharmacist or clinician before switching, since dosing schedules and risk profiles can differ.

13) Market and legal context in the UK

In the United Kingdom, medicines are regulated by the Medicines and Healthcare products Regulatory Agency (MHRA). Product licences determine approved indications, dosing guidance, and safety information. The availability of dydrogesterone may vary between brands and pharmacy channels.

Online pharmacies typically:

• verify eligibility and supply information according to UK medicines regulations
• provide patient leaflets and instructions for safe use
• offer pharmacist support for questions about side effects, interactions, and correct administration

Brand availability: Dydrogesterone may be supplied under different brand names or generic listings depending on current market supply. Always confirm the exact active ingredient and strength.

14) Recent guidance and updates (UK context)

Hormone therapies and progestogen use are subject to ongoing monitoring and periodic updates to safety communications as new evidence emerges. While the underlying role of progestogens in endometrial protection remains consistent, guidance may change around:

• Benefit–risk balance for HRT based on age, time since menopause, and individual risk factors
• Thromboembolic risk awareness and patient counselling
• Use in pregnancy-related indications with evolving clinical practice across guidelines

For the most accurate and up-to-date information, check the medicine’s official patient leaflet and any MHRA safety updates relevant to your product.

15) Delivery and availability (online pharmacy considerations)

Availability can depend on stock levels, packaging size, and regional distribution. Many online pharmacies in the UK can deliver within standard postal or courier timeframes.

• Stock status: Some strengths or packs may be intermittently unavailable.
• Delivery times: Vary by location; check the estimated delivery window at checkout.
• Packaging: Medicines are typically dispatched in secure, discreet packaging.
• Cold-chain: Dydrogesterone tablets usually do not require refrigeration unless specified by your product leaflet.

Storage: Follow storage instructions on the packaging. Keep out of sight and reach of children.

16) FAQ

What is dydrogesterone used for?

Dydrogesterone is a progestogen medicine used to treat conditions where progesterone activity is needed—such as abnormal uterine bleeding related to progesterone deficiency, endometriosis, and to protect the uterine lining when oestrogen is used in HRT (in women who have a uterus).

How quickly does it work?

Some benefits, such as improved bleeding control, can be noticed within days to weeks depending on the condition and dosing schedule. For longer-term conditions like endometriosis, effects may build over time and be assessed at follow-up appointments.

Can I take dydrogesterone with food?

Usually yes. Many patients take it with or without food. If your leaflet specifies a particular approach (for example, after meals), follow that guidance.

What if I miss a dose?

If you miss a dose, take it as soon as you remember unless it is close to the next dose. Do not take a double dose to make up for a missed tablet. If you’re unsure, contact your pharmacist for advice.

Are there interactions with other medicines?

Potential interactions depend on your overall medication list. Tell your pharmacist about all medicines and supplements you take, including herbal products. They can check for interactions relevant to your regimen.

Is it safe to drink alcohol?

Alcohol is not always strictly prohibited, but it may worsen side effects and affect your wellbeing. Keeping alcohol to a minimum is usually sensible. If you feel unwell after drinking, avoid alcohol and ask a pharmacist for guidance.

Can I use dydrogesterone in HRT?

Dydrogesterone may be used as part of HRT to protect the uterus when oestrogen is taken. The correct regimen depends on whether your HRT is cyclical or continuous and your personal risk factors.

What side effects should I watch for?

Common side effects can include headache, nausea, breast tenderness, and spotting. Seek urgent medical help if you develop signs of severe allergy, jaundice, or symptoms suggestive of a serious clot or severe reaction.

How long will I need to take it?

Duration varies by indication. Some treatments are taken for defined cycles; others may be longer-term, especially in HRT. Your clinician will regularly review whether continuing therapy is appropriate.

Can I stop taking dydrogesterone suddenly?

Do not stop without medical advice. Stopping can lead to loss of symptom control or changes in bleeding patterns. If you want to stop, ask a healthcare professional for guidance on timing and any necessary adjustments.

17) When to speak to a pharmacist

If you have questions about how to take dydrogesterone, possible side effects, or interactions with medicines you already use, a UK pharmacist can help. Contact them promptly if you experience unexpected bleeding, severe symptoms, or if you’re unsure about a missed dose.

Disclaimer: This page is for patient information only. Always follow the instructions provided with your specific medicine and consult a healthcare professional if you have concerns.