Cycrin (Medroxyprogesterone)

Cycrin contains medroxyprogesterone, a synthetic form of the hormone progesterone. It is used for several women’s health conditions where progesterone-like activity is helpful. This page explains what Cycrin is, how it works, how it is typically taken, and important safety information in a patient-friendly way for the UK.

Note: Always follow the advice provided by your prescriber or healthcare professional and the instructions on your medicine label. If you are unsure about your regimen, ask a pharmacist.

Quick facts

• Active ingredient: Medroxyprogesterone (MPA)
• Medicine type: Progestogen (progesterone-like hormone)
• Common forms: Tablets (strengths vary by product presentation)
• Typical uses: Irregular bleeding, endometriosis-related symptoms, and other progesterone-responsive conditions (as advised)
• Key considerations: Suitable for many people, but not for everyone—especially if you have certain hormone-sensitive cancers, unexplained vaginal bleeding, or a history of blood clots

How Cycrin works (mechanism of action)

Medroxyprogesterone is a progestogen. In the body, it acts mainly by influencing how the lining of the womb (endometrium) grows and how the menstrual cycle behaves. Depending on the dose and how long it is taken, it can:

• Stabilise the endometrium: It helps make the uterine lining less likely to overgrow.
• Reduce abnormal bleeding: By opposing oestrogen’s effects on the uterine lining, it can help regulate bleeding patterns.
• Support hormone-responsive conditions: In endometriosis, it can help reduce the activity of endometrial-like tissue outside the womb.
• Impact ovulation: Some users may experience reduced ovulation depending on regimen and dose.

Pharmacokinetics (how the body handles Cycrin)

Pharmacokinetics describes absorption, distribution, metabolism, and elimination.

• Absorption: After oral dosing, medroxyprogesterone is absorbed through the gastrointestinal tract.
• Distribution: It circulates in the bloodstream and is distributed throughout body tissues.
• Metabolism: The medicine is primarily metabolised in the liver.
• Elimination: Metabolites are eliminated mainly via urine and faeces.

Individual responses can vary. Factors such as liver function, other medicines, and overall health can affect how quickly and effectively the medicine works.

Typical uses of Cycrin in the UK

Cycrin is used for hormone-related problems in women’s health. Common indications include (exact suitability depends on your medical history and the specific dosing regimen):

• Abnormal uterine bleeding (including irregular bleeding linked to hormone imbalance)
• Endometrial protection and treatment strategies when progesterone support is needed
• Endometriosis-related symptoms (as part of a progesterone-based approach)
• Other progesterone-responsive conditions as determined by a clinician

Important: Cycrin is not the same as treatments for acute emergency bleeding. If you have heavy bleeding, severe pain, or feel unwell, seek urgent medical advice.

When and how to take Cycrin (timing and regimen)

How you take Cycrin depends on the condition being treated. Some people take it on a regular daily schedule, while others take it for a set number of days each cycle.

General timing guidance

• Take at the same time each day (if daily) to help keep hormone levels consistent.
• Follow the cycle instructions if your regimen is “days 1–X” or similar (your label will clarify your schedule).
• Use a reminder (phone alarm or calendar) to avoid missed doses.

If you miss a dose

If you miss a dose, follow the guidance provided by your medicine leaflet or pharmacist. In general:

• Take the missed dose as soon as you remember if it’s close to your usual time.
• If it’s near the time for the next dose, skip the missed dose and continue your normal schedule.
• Do not take a double dose unless instructed.

Because timing can affect bleeding patterns, it is especially important not to make frequent changes to your schedule.

Dose (typical dosing approaches)

Cycrin dosing varies by indication, individual factors, and the chosen regimen. Your prescription label (or care plan) will provide the exact dose and schedule.

Below is a general overview of how dosing schedules are commonly structured (not a replacement for individual instructions):

Always check your exact strength and dose. If you are unsure, ask your pharmacist to verify the dose written on your pack.

Food and Cycrin (food interactions)

Cycrin can generally be taken with or without food. However, taking it consistently with regard to meals may help reduce stomach discomfort and supports routine adherence.

Tip: If you notice nausea or stomach upset, try taking it after food (unless your instructions say otherwise).

There are no well-known “classic” foods that must be avoided for medroxyprogesterone. Still, if your diet includes specific supplements or if you experience gastrointestinal side effects, discuss with your healthcare professional.

Alcohol and medicine interactions

In most cases, moderate alcohol intake is not expected to directly interact with medroxyprogesterone in a dangerous way. However, alcohol can:

• Increase side effects such as dizziness or nausea in some people.
• Worsen irregular bleeding for some individuals indirectly through hormonal or health changes.
• Impact liver health if heavy drinking is involved, which may be relevant because the medicine is metabolised in the liver.

Practical advice: If you drink alcohol, keep to recommended UK guidelines and monitor for side effects. If you have liver disease or a history of heavy alcohol use, seek medical advice before taking hormonal medicines.

Medicine interactions (other medicines that may affect Cycrin)

Some medicines can affect how medroxyprogesterone is metabolised, potentially changing its effect or increasing side effects. Interactions are most commonly related to liver enzyme activity.

Tell your pharmacist if you take:

• Medicines for epilepsy (certain enzyme-inducing anti-epileptics)
• Medicines for tuberculosis (some treatments)
• Some antibiotics/antifungals (particularly strong enzyme inducers or inhibitors)
• St John’s wort (herbal remedy for mood) — may affect hormone levels
• Medicines affecting liver enzymes in general
• Anticoagulants or medicines that affect blood clotting—because hormone therapy may change clot risk

This is not an exhaustive list. For safety, bring a list of all medicines and supplements you take (including herbal products) to your pharmacist.

Indications and who should be careful

Indications

Cycrin is indicated for conditions where a progesterone effect is beneficial, such as:

• Hormonal causes of abnormal uterine bleeding
• Endometrial-related conditions needing progesterone support
• Endometriosis symptoms, when progesterone suppression is appropriate

Who should not use Cycrin (or needs careful assessment)

Cycrin may not be suitable if you have certain medical conditions. Common reasons for avoidance or specialist review include:

• Known or suspected hormone-dependent cancers (for example, certain cancers of the breast or reproductive organs)
• Unexplained vaginal bleeding that has not been investigated
• History of blood clots (such as deep vein thrombosis or pulmonary embolism) or certain clotting disorders
• Severe liver disease or certain liver problems
• Previous allergic reaction to medroxyprogesterone or any ingredient

If any of the above apply, speak to a healthcare professional before starting or continuing Cycrin.

Safety profile: side effects and what to watch for

Like all medicines, Cycrin can cause side effects. Many are mild and improve after the first few weeks, but some require prompt medical attention.

Common side effects

• Changes in bleeding pattern (spotting, irregular bleeding, or altered monthly bleeding)
• Nausea or stomach discomfort
• Headache
• Mood changes (e.g., irritability)
• Breast tenderness
• Fluid retention or feeling “puffy”
• Weight changes (varies by individual)
• Decreased sex drive in some people

Serious side effects: seek urgent medical help

Stop taking Cycrin and seek urgent medical advice if you experience signs of:

• Blood clots:
  • Sudden shortness of breath
  • Chest pain (especially when breathing)
  • Swelling or pain in one leg
• Severe allergic reaction (swollen face/lips, breathing difficulty, widespread rash)
• Severe liver problems:
  • Yellowing of eyes/skin (jaundice)
  • Severe upper abdominal pain
  • Very dark urine
• Stroke-like symptoms (sudden weakness, facial droop, difficulty speaking, sudden vision changes)

When to contact a clinician promptly

• Bleeding becomes very heavy or you feel dizzy/faint
• Persistent unusual bleeding that does not improve after the initial adjustment period
• Severe or worsening headaches, especially with neurological symptoms

Practical use tips for day-to-day success

• Keep a bleeding diary: Record days of spotting or flow, severity, and any associated symptoms (pain, headaches). This helps clinicians adjust the regimen.
• Take it consistently: Use a daily routine (e.g., after breakfast) or a pill organiser.
• Review other medicines regularly: If you start new medicines (including herbal supplements), check interactions.
• Don’t ignore symptom changes: Sudden heavy bleeding, severe pain, or symptoms suggesting blood clots should be addressed promptly.
• Attend follow-ups: Regular review helps ensure the medicine is working and side effects are managed.

Alternative options (what else may be considered)

If Cycrin is not suitable, not well tolerated, or does not control symptoms, several other options may be considered depending on the underlying condition.

For abnormal uterine bleeding

• Other progestogens (different types or formulations)
• Levonorgestrel-releasing intrauterine system (LNG-IUS) for some bleeding patterns
• Non-hormonal approaches (depending on cause), such as tranexamic acid in appropriate cases
• Addressing contributing factors (e.g., anaemia, thyroid issues)

For endometriosis

• Other hormone treatments (e.g., different progestogen regimens or other suppression strategies)
• Specialist pain management and lifestyle measures
• Surgical options in selected cases

Choice depends on symptoms, age, medical history, fertility plans, and risk factors such as clot history or liver disease. A clinician can help you compare benefits and risks.

UK market and legal context (information for patients)

In the United Kingdom, medicines like Cycrin are regulated through the Medicines and Healthcare products Regulatory Agency (MHRA). Prescribing and supply are arranged via healthcare services and, where appropriate, community pharmacies.

Over time, UK guidance and clinical practice may evolve based on safety updates and evidence. If you are currently taking Cycrin, continue your course as advised and do not stop abruptly without medical guidance.

Recent guidance and safety considerations in the UK

While specific advice can vary by individual circumstances, general UK safety themes for progestogen and hormone medicines include:

• Awareness of clot risk: People with risk factors for venous thromboembolism should be assessed carefully.
• Monitoring bleeding changes: Unexplained persistent vaginal bleeding should be investigated.
• Liver health awareness: Any new signs of liver dysfunction should prompt medical review.
• Drug interaction checks: Certain liver enzyme–affecting medicines and herbal products can change hormone effects.

Local NHS guidance and professional society recommendations may be updated. If you receive new advice from your healthcare team, it will take priority over general information online.

Delivery and availability (online pharmacy)

Availability can vary by strength, pack size, and current demand. Many UK pharmacies offer delivery services, typically with standard and express options depending on your location and the courier partner.

• Dispatch times: Commonly 1–2 working days after order confirmation (may vary).
• Delivery times: Often next-working-day to several working days depending on service.
• Packaging: Medicines are sent in secure, tamper-evident packaging.
• Temperature considerations: Most tablets do not require refrigeration; follow label storage instructions.

If your order is delayed, contact the pharmacy’s customer service team with your order number.

Storage

• Store below 25°C unless your pack instructs otherwise.
• Keep the container tightly closed.
• Store in a place where children cannot see or reach.
• Do not use after the expiry date printed on the pack.

FAQ: Cycrin (medroxyprogesterone)

1) What is Cycrin used for?

Cycrin is a progesterone-like medicine used for conditions where progesterone effect is helpful, such as abnormal uterine bleeding and endometriosis-related symptoms, depending on your individual diagnosis and treatment plan.

2) How long does it take to work?

Some people notice changes in bleeding within days to weeks. For longer-term conditions (e.g., endometriosis), symptom improvement may take longer. Your clinician can advise what timeframe is realistic for your regimen.

3) Will Cycrin stop my periods?

It may change your bleeding pattern. Some people have lighter bleeding or fewer periods, while others may have spotting, especially during the first months. If bleeding is heavy or continues to be unusual, seek medical advice.

4) Can I take Cycrin with food?

It can usually be taken with or without food. If you find it upsets your stomach, try taking it after a meal and keep the timing consistent.

5) Is it safe to drink alcohol while taking Cycrin?

Moderate alcohol is generally not expected to directly interact with medroxyprogesterone, but alcohol may worsen side effects or affect liver health. If you have liver problems or drink heavily, consult a healthcare professional first.

6) What medicines can interact with Cycrin?

Some medicines can affect hormone metabolism, including certain anti-epileptics, tuberculosis treatments, and herbal products like St John’s wort. Always check with a pharmacist if you start or stop any medicine or supplement.

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

Follow the guidance in your medicine leaflet or ask your pharmacist. Do not take a double dose unless instructed. Missing doses can affect bleeding control in some people.

8) Who should seek urgent help while taking Cycrin?

Seek urgent medical advice if you develop symptoms that could indicate a blood clot (such as sudden shortness of breath, chest pain, or leg swelling), a severe allergic reaction, or signs of serious liver problems.

9) Are there alternatives to Cycrin?

Yes. Depending on why you are taking Cycrin, alternatives may include other progestogens, an intrauterine system for bleeding control, non-hormonal options, or specialist treatments for endometriosis.

10) Can I use Cycrin if I’m trying to conceive?

Your fertility plans matter. Because medroxyprogesterone affects hormone balance, you should discuss your goals with a healthcare professional before continuing or starting treatment.

Remember: If you have concerns about side effects, interactions, or changes in bleeding, contact your pharmacist or healthcare team. Prompt advice can help ensure your treatment stays safe and effective.