Cycrin (Medroxyprogesterone) — Patient Information

Cycrin contains medroxyprogesterone, a synthetic form of the naturally occurring hormone progesterone. It is used in a range of gynaecology and hormone-related conditions, helping to control bleeding patterns and support specific hormonal treatment needs.

This guide explains how Cycrin works, how it’s taken, what to expect, and important safety information. It is written for people using an online pharmacy service in the United Kingdom.

Key product information

• Active ingredient: Medroxyprogesterone
• Medicine type: Progestogen (hormone therapy)
• Common uses: Treatment of certain menstrual and uterine conditions (depending on the prescribed regimen)
• How it’s supplied: Usually tablets (strengths may vary by brand/pack)
• UK availability: Widely available through prescription channels and licensed supply routes

Note: The exact strength and dosing schedule can differ based on the condition being treated. Always follow the specific regimen provided for you.

How Cycrin works (mechanism of action)

Medroxyprogesterone is a progestogen that acts on progesterone receptors in the body. Its main effects include:

• Stabilising the uterine lining (endometrium): Progesterone helps regulate how the endometrium grows and sheds.
• Reducing abnormal bleeding: By influencing endometrial development, medroxyprogesterone can help control irregular, heavy, or unpredictable bleeding.
• Altering hormone signalling: It affects the hypothalamic–pituitary axis, influencing ovarian hormone patterns.
• Hormone balance: It may be used in specific combinations (e.g., alongside oestrogen in certain menopausal regimens) to protect the endometrium.

Because it is a hormone medicine, effects are usually seen over days to weeks, depending on the condition being treated.

Pharmacokinetics (how the body processes Cycrin)

Pharmacokinetics describes what happens to a medicine in the body: absorption, distribution, metabolism, and elimination.

• Absorption: Medroxyprogesterone is absorbed after oral dosing. Peak blood levels generally occur within a few hours (timing varies by formulation).
• Distribution: It is widely distributed in body tissues and binds to plasma proteins to a degree.
• Metabolism: It is metabolised mainly in the liver (via hepatic pathways).
• Elimination: Metabolites are cleared primarily through urine and faeces.
• Half-life: Medroxyprogesterone has an elimination half-life that supports once-daily regimens in many settings (exact values vary between individuals).

If you miss a dose, effects may be reduced, and bleeding patterns may change—so it’s important to follow your dosing schedule and seek advice if doses are missed.

Typical indications (what it may be used for in the UK)

Cycrin is used for progesterone-responsive conditions. Common indications include:

• Abnormal uterine bleeding related to hormonal imbalance (e.g., irregular bleeding patterns)
• Endometrial hyperplasia in appropriate situations where progesterone therapy is suitable (the exact approach depends on clinical assessment)
• Support in certain hormone regimens where progestogen is needed to balance oestrogen effects on the endometrium (as determined by a clinician)
• Other gynaecology indications depending on diagnosis and treatment plan

Important: Indications can vary by formulation, strength, and treatment schedule. Your healthcare professional will tailor therapy to your diagnosis and risk profile.

Dosing and timing

Cycrin dosing depends on the condition being treated and how your body responds. In practice, regimens may be:

• Continuous daily dosing (for some conditions)
• Cyclical dosing (taken for a set number of days each month, then stopped during other parts of the cycle)

How to take it:

• Take at the same time each day if you are on a daily regimen.
• If your schedule is cyclical, follow the calendar-based plan precisely.
• Swallow tablets with water. You can usually take them with or without food (see food interactions below).

Starting to see effects:

• For bleeding-related symptoms, improvement may take several days to a few weeks.
• Changes to cycle pattern or bleeding may occur over the first treatment cycle.

If you miss a dose:

• Take it as soon as you remember if it is close to the planned time.
• If it’s nearly time for the next dose, skip the missed dose and continue as usual.
• Do not double dose.
• Contact a pharmacist or clinician if you are unsure, especially if you miss multiple doses.

Food interactions and eating habits

Medroxyprogesterone can generally be taken with or without food. Food does not usually require dose adjustment. However:

• If you notice stomach upset, taking the tablet with a light meal may help.
• Try to maintain a consistent routine to help you remember doses and keep absorption stable.

Grapefruit and similar products: There are no widely required dietary restrictions specifically for Cycrin, but if you take other medicines with known interactions, check them individually.

Alcohol and medicine interactions

Alcohol does not have a single universal interaction with medroxyprogesterone for all people, but it can affect your overall tolerance and may worsen side effects such as:

• Dizziness or tiredness
• Headache
• Mood changes
• Nausea or stomach discomfort

Practical advice:

• If you drink alcohol, keep it moderate and monitor how you feel after taking Cycrin.
• Avoid heavy drinking, especially during the first days of treatment while you’re learning how you respond.

General medicine interaction note: The most important interactions are with medicines that affect how the liver metabolises hormones. Tell your pharmacist if you take any of the following categories:

• Enzyme inducers (some anti-epileptics, certain TB medicines, and some herbal products such as St John’s wort)
• Other hormone therapies or medicines for endometriosis/hormonal conditions
• Anticoagulants (blood thinners) or medicines affecting clotting
• Corticosteroids or medicines with liver effects

Your pharmacist can check potential interaction risks based on your exact regimen and other medicines.

Safety profile: side effects and who should be cautious

Like all medicines, Cycrin can cause side effects. Many people tolerate it well, but it’s important to know what to expect and when to seek medical help.

Common side effects

• Changes in bleeding (spotting, irregular bleeding, or changes in period pattern)
• Nausea or mild stomach upset
• Headache
• Breast tenderness or swelling
• Fluid retention or feeling “puffy”
• Mood changes (e.g., irritability, mood swings) in some people
• Changes in appetite

Less common but important risks

Progestogens can affect cardiovascular and clotting risk in some circumstances. The following may be linked to hormonal therapy, particularly in people with risk factors:

• Blood clots (deep vein thrombosis, pulmonary embolism) — rare, but serious
• Stroke or heart problems — risk depends on individual factors
• Liver problems (seek advice if you have symptoms suggesting liver issues)

Seek urgent medical advice immediately if you notice

• Signs of blood clot: sudden shortness of breath, chest pain, coughing blood, swelling/pain in one leg
• Stroke symptoms: face drooping, arm weakness, speech difficulty
• Severe allergic reaction: swelling of lips/face, breathing difficulty, widespread rash
• Severe or persistent abdominal pain or yellowing of skin/eyes (jaundice)

Who should use Cycrin with extra caution

Discuss suitability with a clinician/pharmacist if you have (or have had) any of the following:

• History of blood clots or clotting disorders
• Known liver disease
• Unexplained vaginal bleeding that hasn’t been assessed
• Breast cancer or other hormone-sensitive cancers
• Strong personal or family history of thromboembolic events
• Severe migraines, especially with neurological symptoms

Pregnancy: If you might be pregnant, seek medical advice before starting or continuing. Hormonal medicines can affect bleeding patterns and may mask symptoms.

Breastfeeding: Medroxyprogesterone may pass into breast milk; individual advice is important.

Practical use tips for best results

• Set a daily reminder (phone alarm or calendar entry) to reduce missed doses.
• Track bleeding changes in a simple diary, especially during the first 1–3 cycles.
• Know your schedule: if your regimen is cyclical, mark start and stop dates.
• Don’t stop early because bleeding has changed—unless advised by your healthcare professional.
• Report persistent abnormal bleeding, especially if it continues beyond the expected adjustment period.
• Use supportive measures: stay hydrated if you experience fluid retention; manage nausea with light meals if needed.

Alternative options

Depending on your diagnosis, symptoms, and risk factors, alternatives may include:

• Other progestogens (different oral or hormonal forms)
• Levonorgestrel-releasing intrauterine system (LNG-IUS) for some uterine bleeding and endometrial protection indications
• Combined hormone therapies where appropriate (e.g., specific menopausal regimens)
• Non-hormonal approaches for certain bleeding types, including antifibrinolytics or other symptom-directed treatments
• Surgical or procedural options for selected cases (e.g., if bleeding is refractory)

The best alternative depends heavily on the underlying cause of bleeding and your personal risk profile. A pharmacist can explain options available through UK services and what to discuss with your clinician.

Market and legal context (UK)

Cycrin containing medroxyprogesterone is an established medicine used in the UK for hormone-responsive conditions. In the UK, hormone medicines are regulated by relevant medicines legislation and are supplied through licensed channels. Availability may depend on:

• National and local formulary arrangements
• Product strength and pack size
• Clinical suitability and prescriber guidance

Branding and formulations: You may see different strengths or schedules based on the manufacturer’s product presentation.

Recent guidance (what to consider)

Guidance for abnormal uterine bleeding and endometrial conditions in the UK continues to emphasise:

• Accurate diagnosis (including ruling out malignancy where appropriate)
• Risk-based treatment selection (clotting, liver health, and cancer history)
• Follow-up when symptoms persist or when therapy is used for endometrial protection
• Patient awareness of symptoms that require urgent review, such as clotting signs

If you have been prescribed Cycrin for bleeding or endometrial concerns, ensure follow-up is arranged as advised and report new or worsening symptoms promptly.

Delivery and availability

Online pharmacies in the UK typically supply Cycrin based on standard legal and clinical checks. Delivery availability depends on your selected provider and local postcodes.

What to expect when ordering:

• Stock status: Some strengths/pack sizes may be subject to short-term supply changes.
• Dispatch times: Vary by provider; you’ll usually see an estimated delivery window at checkout.
• Packaging: Medicines are delivered in appropriate protective packaging with patient information.
• Temperature and storage: Store tablets according to the pack instructions (commonly at room temperature away from moisture and heat).

If your preferred strength is temporarily unavailable, contact customer support for alternatives (e.g., different strengths or pack sizes) that match your regimen.

How to store Cycrin

• Keep tablets in the original packaging.
• Store at room temperature and away from heat sources.
• Protect from moisture and direct sunlight.
• Keep out of sight and reach of children.

FAQ — Cycrin (medroxyprogesterone)

1. What is Cycrin used for?

Cycrin is used for hormone-related conditions, most commonly to help manage certain types of abnormal uterine bleeding and to support treatment strategies where progestogen therapy is appropriate. The exact indication depends on your diagnosis and prescribed schedule.

2. When will I notice changes in my bleeding?

Some people notice bleeding changes within the first week or two, while others may take longer. If you are on cyclical dosing, patterns often become clearer over the first 1–3 cycles. Persistent or very heavy bleeding should be assessed.

3. Can I take Cycrin with food?

In most cases, yes. You can take it with or without food. If you experience nausea, taking it with a meal may help.

4. Is it safe to drink alcohol while taking Cycrin?

Moderate alcohol use may be acceptable for many people, but alcohol can worsen side effects like dizziness, headaches, or nausea. If you’re unsure or experience side effects, reduce or avoid alcohol and ask a pharmacist for advice.

5. What should I do if I miss a dose?

Take it as soon as you remember if it’s close to the planned time. If it’s near the next dose, skip the missed dose. Do not double up. If you miss more than one dose or you’re unsure, contact a pharmacist.

6. What are the most serious side effects I should watch for?

Seek urgent help if you develop signs of a blood clot (such as chest pain, shortness of breath, or swelling in one leg), symptoms of stroke, severe allergic reactions, or signs of liver problems (like yellowing skin/eyes).

7. Can Cycrin affect mood or cause headaches?

Yes. Mood changes and headaches are among the reported side effects. If symptoms are severe, worsening, or affecting daily life, speak to a healthcare professional.

8. Are there drug interactions?

Yes, some medicines can affect how medroxyprogesterone is metabolised or can influence bleeding/clotting risk. Tell your pharmacist about all medicines you take, including herbal supplements like St John’s wort.

9. What if I become pregnant while taking Cycrin?

If you think you may be pregnant, contact a healthcare professional promptly. Do not stop or change your treatment without advice, unless you’ve been instructed to do so.

10. What are my alternatives if Cycrin isn’t suitable?

Alternatives depend on the reason for treatment and may include other progestogens, a levonorgestrel intrauterine system, other hormonal regimens, non-hormonal options for bleeding, or procedural approaches where appropriate.

Summary

Cycrin (medroxyprogesterone) is a progestogen medicine used to manage selected hormone-responsive conditions, particularly certain patterns of uterine bleeding and related endometrial concerns. It works by stabilising the uterine lining and influencing hormone signalling. Like other hormone therapies, it can cause changes in bleeding and other side effects, and in rare cases may be associated with serious risks such as blood clots.

For the safest and most effective use, take Cycrin exactly as directed, keep track of your symptoms, and seek prompt medical advice if you develop serious warning signs or persistent abnormal bleeding.