Prometrium (Progesterone) – Patient Information (Australia)

Prometrium is a brand of micronised progesterone, a hormone used to support the female reproductive system. This medicine is available in Australia and is commonly used in hormone therapy regimens, especially when progesterone is needed to protect the womb lining or to support certain fertility-related treatments.

This guide is written to be patient-friendly and aims to explain how Prometrium works, how it’s taken, what to expect, and important safety considerations. Always follow the instructions provided by your healthcare professional and read the Consumer Medicine Information (CMI) that comes with your medicine.

Quick Overview

• Medicine name: Prometrium (progesterone)
• Active ingredient: Micronised progesterone
• Type: Hormone therapy
• Common uses: Indicated for progesterone support in specific conditions (details below)
• Common route: Oral capsules
• Key benefit: Helps counter effects of oestrogen on the womb lining and supports hormone balance

Basic Product Information

Note: Strengths and exact instructions can vary between product presentations. Confirm your capsule strength and schedule with your prescribed regimen or the CMI.

How Prometrium Works (Mechanism of Action)

Progesterone is a natural hormone that plays a key role in:

• Preparing and maintaining the uterine lining (endometrium)
• Supporting pregnancy by helping stabilise hormonal conditions early in gestation
• Balancing the effects of oestrogen in hormone therapy regimens

Endometrial protection: When oestrogen is used without adequate progesterone, the uterine lining may overgrow. Progesterone helps counterbalance oestrogen to reduce the risk of endometrial overgrowth.

Reproductive support: In fertility-related protocols, progesterone can help provide the right hormonal environment for implantation and early pregnancy support (as directed in the specific plan).

Pharmacokinetics (How the Body Processes It)

“Pharmacokinetics” describes what happens to a medicine in the body—how it is absorbed, distributed, metabolised, and eliminated.

Absorption

Micronised progesterone is absorbed after oral dosing. Food can influence how quickly levels rise, which may affect timing of effects.

Distribution

Progesterone is distributed throughout body tissues and acts on progesterone receptors in target organs such as the uterus.

Metabolism

Progesterone is metabolised primarily in the liver. Metabolites are then processed further before elimination.

Elimination

Progesterone metabolites are eliminated mainly via the kidneys (urine) and partly through other routes.

Practical takeaway: Because progesterone is processed by the liver, people with significant liver impairment require medical supervision.

Typical Uses and Indications

Prometrium is used for conditions where progesterone support is needed. The exact indication and regimen depend on your clinical situation.

• Hormone therapy: Often used as part of menopausal hormone therapy in people with a uterus who require progesterone to protect the endometrium when oestrogen is used.
• Fertility and early pregnancy support: May be used in certain assisted reproduction and fertility protocols, where progesterone support is required during specific cycles.
• Other progesterone-responsive conditions: Your clinician may use progesterone for other circumstances based on medical assessment and guideline recommendations.

Important: Always use progesterone only as directed for your specific situation. Indications and recommended schedules differ between patients.

Dosing (General Guidance)

Dosing for Prometrium varies depending on the purpose of treatment. Your regimen may include:

• Cyclic dosing (for example, days of the menstrual cycle)
• Continuous daily dosing (commonly for certain hormone therapy schedules)
• Higher or different schedules in fertility-related protocols

How to take it:

• Swallow the capsule whole with water.
• Do not open, crush, or chew the capsule unless instructed otherwise by your product information or clinician.
• Try to take it at the same time each day to keep hormone levels more consistent.

Timing around meals: See the food interaction section below for practical advice.

If you miss a dose: Take it as soon as you remember if it is close to the scheduled time. If it is nearly time for the next dose, skip the missed dose and continue your regular schedule. Do not take double doses unless advised by your healthcare professional.

If you are unsure, check the CMI or contact a pharmacist.

Timing Tips (When to Take Prometrium)

Many people prefer taking progesterone in the evening because it can be associated with sleepiness or a feeling of relaxation in some individuals.

• Evening administration may be helpful if you experience drowsiness.
• If your schedule is cyclical, keep a clear calendar of dosing days.
• Use reminders (phone alarm, blister pack organiser) to reduce missed doses.

Adherence matters: If progesterone is being used as part of an ongoing hormonal regimen, consistent timing helps achieve the intended effect.

Food Interactions

Progesterone absorption can be affected by food. In many cases, this doesn’t require special dietary changes, but it may influence how quickly effects occur.

• Follow your medicine’s instructions: The CMI for your specific product may recommend taking it with or without food.
• Be consistent: If you typically take it with food, keep doing so. If you typically take it on an empty stomach, keep that routine.

General practical advice: If you notice stomach upset, mild nausea, or discomfort, taking the capsule with a small meal may help—unless your CMI recommends otherwise.

Alcohol and Medicine Interactions

Alcohol may increase side effects such as dizziness, drowsiness, or impaired coordination, which can be more noticeable when starting progesterone or when doses are adjusted.

• Recommendation: Keep alcohol intake moderate and observe how you feel.
• Avoid driving or operating machinery if you feel sleepy, dizzy, or slowed down after taking Prometrium.

Other interactions: Progesterone can interact with certain medicines due to liver enzyme activity. Always tell your pharmacist or clinician about all medicines and supplements you take.

Medicine Interactions (Important Safety Notes)

Progesterone is metabolised in the liver. Some medicines can alter enzyme activity and affect progesterone levels, potentially changing effectiveness and side effect risk.

Please consult a healthcare professional if you take any of the following types:

• Enzyme inducers (may lower progesterone levels): for example, some anti-seizure medicines and certain antibiotics/antivirals
• Strong enzyme inhibitors (may increase progesterone levels)
• Herbal products (e.g., St John’s wort) which may affect drug metabolism

Always provide a full list of medications to your pharmacist, including over-the-counter products and vitamins.

Safety Profile and Side Effects

Like all medicines, Prometrium can cause side effects. Not everyone experiences them, and some may lessen as your body adjusts.

Common side effects

• Drowsiness or feeling sleepy
• Dizziness
• Headache
• Nausea or mild stomach discomfort
• Bloating or fluid retention
• Breast tenderness
• Mood changes in some people

Serious side effects – seek medical help urgently

Contact urgent medical care or seek immediate advice if you develop signs of a serious reaction, such as:

• Signs of a blood clot (e.g., sudden shortness of breath, chest pain, coughing blood, one-sided leg swelling or pain, sudden weakness/numbness)
• Severe allergic reaction (swelling of face/lips, difficulty breathing, severe rash)
• Severe liver problems (yellowing of skin/eyes, dark urine, severe fatigue)
• Unusual heavy or persistent bleeding
• Severe or persistent headache, vision changes, or migraine-like symptoms

These risks depend on your individual medical history and other medications. Your clinician can help assess your suitability for therapy.

Practical Use Tips (How to Get the Best Results)

• Keep a consistent routine: Take Prometrium at the same time each day.
• Plan for sleepiness: If you feel drowsy, take it in the evening and avoid alcohol.
• Manage missed doses: Use phone reminders and a calendar for cycle-based regimens.
• Track symptoms: If you’re using progesterone for hormone therapy, monitor bleeding pattern changes and report unexpected symptoms.
• Follow storage instructions: Store capsules as directed on the label and keep out of reach of children.
• Don’t stop abruptly without advice: Especially if used as part of an established hormonal plan.

Special Considerations

Liver disease

If you have liver impairment, progesterone may not be suitable or may require closer monitoring. Discuss your history with a clinician or pharmacist.

Breast cancer or hormone-sensitive conditions

Hormone therapies can affect hormone-responsive tissues. A careful risk–benefit assessment is required.

Vaginal bleeding

Any unexpected or heavy bleeding should be evaluated promptly to rule out other causes.

Pregnancy and breastfeeding

Progesterone may be used in certain fertility and early pregnancy support contexts under medical direction. Breastfeeding guidance depends on the situation; discuss individual advice with a healthcare professional.

Alternative Options

If Prometrium isn’t suitable for you, there may be other progesterone options depending on your indication. Alternatives can include:

• Other oral micronised progesterone brands
• Different progestogen preparations (depending on availability and your clinical plan)
• Vaginal or other routes of progesterone in certain fertility protocols (used when appropriate)

Choosing an alternative: The “best” option depends on factors such as your indication, side effect profile, absorption considerations, and how your clinical team monitors your treatment.

Market and Legal Context in Australia

In Australia, medicines are regulated by the Therapeutic Goods Administration (TGA). Availability, prescribing requirements, and pharmacy supply rules vary by product and indication. For progesterone products like Prometrium, supply is typically managed through licensed channels, and patients are advised to ensure they receive appropriate counselling from a pharmacist or healthcare provider.

What this means for you:

• Ensure you purchase from reputable, properly registered suppliers.
• Check that the product name, strength, and batch information match what was recommended for you.
• Keep the original packaging and paperwork for reference.

Note: This page provides general information and does not replace clinical assessment.

Recent Guidance (General Notes)

Clinical guidance around hormone therapy and progesterone use may evolve as new evidence becomes available. In practice, updated recommendations commonly focus on:

• Individualised risk assessment (e.g., thrombotic risk, cardiovascular risk, and endometrial protection needs)
• Using the lowest effective dose for the shortest necessary duration
• Monitoring symptoms and reviewing treatment regularly
• Attention to bleeding patterns and endometrial health where applicable

Your healthcare professional can explain how current evidence applies to your specific situation and whether any changes to monitoring or regimen are recommended.

Delivery and Availability (Australia)

Online pharmacies in Australia often provide home delivery or parcel pickup options. Availability can depend on stock levels, shipping schedules, and product strength.

• Check stock status on the website before ordering.
• Delivery timelines vary by location and courier service.
• Packaging: Medicines are typically packed securely to protect capsules and labels during transit.
• Cold chain: Prometrium capsules are generally not temperature-sensitive in the way that some vaccines are, but always follow the storage conditions on the label.

For the most accurate delivery estimates, refer to the shipping information shown at checkout.

FAQ – Prometrium (Progesterone)

1) What is Prometrium used for?

Prometrium (micronised progesterone) is used in situations where progesterone support is needed, such as hormone therapy regimens requiring endometrial protection, and in certain fertility-related protocols where progesterone is used to support hormonal conditions during a cycle.

2) How long does it take to work?

Progesterone effects can begin after absorption, but the measurable clinical outcome depends on the reason for treatment (e.g., endometrial support or cycle timing). Some side effects (like sleepiness or nausea) may be noticed soon after starting, while hormonal and bleeding-related effects may take days to be evident.

3) Should I take Prometrium with food?

Follow the instructions in the CMI for your exact product. If no specific direction is given, many people find consistency helps—either always with a meal or always on an empty stomach—based on what your clinician/pharmacist recommends.

4) Can I drink alcohol while taking Prometrium?

It’s best to keep alcohol moderate. Alcohol may increase dizziness or drowsiness. Avoid driving or hazardous activities if you feel sleepy or unwell after taking the medicine.

5) What if I miss a dose?

Take the missed dose when you remember if it’s close to the scheduled time. If it is near the next scheduled dose, skip the missed dose and continue as normal. Do not double up unless your healthcare professional advises it.

6) Are there foods I should avoid?

There are no widely required dietary restrictions, but food can affect absorption timing. Maintain a consistent routine as advised on the CMI.

7) What side effects are most common?

Common side effects include drowsiness, dizziness, headache, nausea, bloating, breast tenderness, and mood changes in some people.

8) When should I seek urgent help?

Seek urgent medical attention for symptoms that may suggest a serious allergic reaction, a blood clot, severe liver problems (e.g., yellowing skin/eyes), or severe/persistent symptoms such as unusual heavy bleeding or intense headaches with vision changes.

9) Can Prometrium affect my driving or work?

Some people feel sleepy or dizzy. If you notice drowsiness, consider taking the capsule in the evening (if consistent with your dosing instructions) and avoid driving or operating machinery until you know how the medicine affects you.

10) Are there alternatives to Prometrium?

Yes—depending on your indication, there may be other progesterone brands or different progesterone forms (including other routes). Your clinician or pharmacist can advise what is appropriate for your circumstances.

Important Reminder

Prometrium can be a helpful part of hormone therapy or fertility-related treatment plans when used correctly. If you have questions about timing, side effects, or interactions with other medicines, a pharmacist can provide personalised advice. Always use the regimen recommended for your condition and keep follow-up appointments for review.

If you think you may have taken too much or experience severe symptoms, seek medical help immediately.