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Cycrin

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Cycrin (medroxyprogesterone) is a progestin hormone used to treat amenorrhea and abnormal uterine bleeding caused by hormonal imbalances. It helps adults by regulating the ovulation process and the lining of the uterus, restoring a normal menstrual cycle and addressing hormonal deficiencies.


Availability
In Stock
Delivery Time
Airmail (14-21 days) | EMS trackable (5-9 days)
Product is shipped in a fully discreet envelope with no content disclosure, including all required documentation inside

Product Sheet

Active Ingredient(s)
Medroxyprogesterone
Reference Brand
Provera
Manufacturer
Wyeth-Ayerst
Product Form
Tablet
Regulatory Classification
Rx
Primary Category
Hormone Therapy
Product Category
Genito-urinary system and sex hormones, Progestogens
Pharmacological Class
Progestin derivatives
Manufacturer Description
A progestin hormone used to treat menstrual disorders and prevent overgrowth of the uterine lining.
Mechanism of Action
This medication is a synthetic form of the hormone progesterone. It works by replacing the hormone in women who do not produce enough naturally and by signaling the uterus to stop growing its lining and start shedding it.
Route of Administration
Oral
Onset Time
Several days of consistent use
Duration
Varies by treatment cycle
Contraindications
History of blood clots, Breast cancer, Liver disease, Undiagnosed vaginal bleeding
Severe Adverse Events
Sudden shortness of breath, Severe headache or vomiting, Chest pain, Lumps in the breast
Common Side Effects
Breast tenderness, Headache, Weight changes
Uncommon Side Effects
Changes in menstrual flow, Acne, Insomnia
Drug Interactions
Rifampin, Phenytoin, Carbamazepine, St. John's wort
Pregnancy Safety Warnings
Not for use during pregnancy; can cause birth defects.
Age Restrictions
Not for use before menarche
Storage Guidelines
Store at room temperature away from light.
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Cycrin FAQ

Can I travel internationally with Cycrin tablets?

Yes, Cycrin tablets may be taken while traveling, but you should carry a copy of the prescription and keep the medication in its original packaging. Some countries may require documentation for prescription-only medicines, so it is advisable to check the destination’s import rules before departure.

Does Cycrin have any inactive ingredients that could cause allergies?

The tablet formulation contains common excipients such as lactose, magnesium stearate, and microcrystalline cellulose. If you have known hypersensitivity to any of these substances, discuss alternatives with your clinician.

How does Cycrin differ from other progestogen brands available in the UK?

Cycrin is distinguished by its specific dosage strengths (5 mg and 10 mg) and tablet formulation. While the active ingredient, medroxyprogesterone, is shared across brands, differences in excipients, tablet size, and manufacturer may affect tolerability for some patients.

Will taking Cycrin affect my results on drug-testing for employment or sports?

Medroxyprogesterone is not typically screened for in standard workplace or athletic drug tests. However, if a specific hormone panel is requested, the presence of a progestogen could be reported. Always disclose all medications to the testing authority if required.

Is Cycrin safe to use while I am breastfeeding?

Cycrin is not recommended during breastfeeding because medroxyprogesterone is excreted in breast milk and may affect the infant. Alternative treatments should be considered in consultation with a healthcare professional.

What should I do if I experience unexpected heavy bleeding while on Cycrin?

Heavy or prolonged bleeding warrants prompt medical evaluation. Contact your prescriber or seek urgent care to rule out serious complications such as endometrial pathology or thromboembolic events.

Can diet influence the effectiveness of Cycrin?

Dietary factors have minimal impact on Cycrin absorption, but a high-fat meal may slightly increase its bioavailability. Consistency in taking the tablet with the same type of meal (or none) each day helps maintain stable drug levels.

Are there any known drug interactions with herbal supplements?

Certain herbal products, such as St. John’s wort, can induce CYP3A4 and potentially lower medroxyprogesterone concentrations, reducing therapeutic effect. Inform your healthcare provider about all supplements you are taking.

How long can I stay on Cycrin therapy?

The duration of treatment depends on the underlying condition. For endometriosis, therapy may extend for several months to years under medical supervision, whereas short-term use for menstrual irregularities may last only a few cycles. Regular review with your clinician determines the appropriate length of therapy.

What is the typical cost of Cycrin compared with generic medroxyprogesterone?

Brand-named Cycrin may be priced higher than generic medroxyprogesterone tablets due to branding and manufacturing costs. NHS prescription charges apply unless you qualify for exemptions. For exact pricing, consult your pharmacy or NHS prescription service.

Cycrin: Medroxyprogesterone Pill Overview

Cycrin is a brand-name medication that contains the synthetic progestogen medroxyprogesterone as its active ingredient. It is supplied as oral tablets (pill form) in 5 mg and 10 mg strengths. In the United Kingdom, Cycrin is a prescription-only medicine (POM) regulated by the Medicines and Healthcare products Regulatory Agency (MHRA). The drug is classified within women’s health therapies and is used to modify hormonal activity in a range of gynecological conditions.

How Cycrin Works in the Body

Medroxyprogesterone belongs to the class of synthetic progestogens, which mimic the actions of natural progesterone. After oral ingestion, the tablet is absorbed from the gastrointestinal tract and binds to progesterone receptors throughout the endometrium, breast tissue, and the central nervous system. Activation of these receptors:

  • Suppresses estrogen-driven endometrial proliferation, helping to stabilise the uterine lining.
  • Induces secretory transformation of the endometrium, preparing it for potential implantation and reducing irregular bleeding.
  • Modulates the hypothalamic-pituitary-ovarian axis, leading to decreased gonadotropin release and, consequently, reduced ovarian hormone production.

The onset of hormonal effects typically occurs within a few days, with peak plasma concentrations reached in about 2-4 hours after a single dose. Medroxyprogesterone is metabolised primarily by the liver enzyme CYP3A4 and has a half-life of roughly 12-15 hours, allowing once-daily dosing.

Conditions Treated with Cycrin

Cycrin is approved by the MHRA for the following indications in adult women:

  • Management of endometriosis and related pelvic pain, where suppression of ectopic endometrial tissue is required.
  • Treatment of irregular or abnormal uterine bleeding (e.g., dysfunctional uterine bleeding) caused by hormonal imbalance.
  • Prevention of endometrial hyperplasia in women receiving estrogen-containing hormone replacement therapy (HRT).

These approved uses are based on the drug’s ability to provide progestogenic protection against unchecked estrogen stimulation of the uterine lining.

Patient Suitability and Contraindications

Who Should Use Cycrin?

  • Adult women with a confirmed diagnosis of endometriosis, dysfunctional uterine bleeding, or those on combined HRT needing endometrial protection.
  • Patients who are not pregnant, not breastfeeding, and have no known hypersensitivity to medroxyprogesterone or any tablet excipients.

Absolute Contraindications

  • Known hypersensitivity to medroxyprogesterone acetate or any component of the tablet.
  • Active or past history of thromboembolic disease (deep-vein thrombosis, pulmonary embolism).
  • Unexplained vaginal bleeding of unknown origin.
  • Severe liver disease (e.g., hepatic failure, cholestasis).
  • Pregnancy - medroxyprogesterone is not indicated for use in pregnant women.

Relative Contraindications

  • Mild to moderate liver impairment - dose adjustment and close monitoring may be required.
  • Diabetes mellitus - progestogens can affect glucose control; regular monitoring is advised.
  • Hypertension - monitor blood pressure periodically.
  • History of mood disorders - progestogens may influence mood; assess mental health status.

Special Populations

  • Pregnancy & Lactation: Cycrin must be avoided during pregnancy. It is excreted in breast milk; breastfeeding women should not use the medication.
  • Elderly Women: Age-related reduction in hepatic metabolism may necessitate lower initial dosing.
  • Renal Impairment: No specific dose adjustment is required, but clinical judgement should guide therapy.

Safety Profile: Side Effects and Interactions

Common Side Effects

  • Irregular menstrual bleeding or spotting - often observed during the first cycles of therapy.
  • Headache - mild to moderate intensity, usually transient.
  • Breast tenderness or enlargement - resolves with continued use.
  • Nausea or mild gastrointestinal upset - can be mitigated by taking the tablet with food.
  • Weight gain or fluid retention - monitor body weight if prolonged therapy is planned.

Serious Adverse Events

  • Thromboembolic events (deep-vein thrombosis, pulmonary embolism) - require immediate medical attention.
  • Severe liver dysfunction - indicated by jaundice, dark urine, or marked fatigue; discontinue the drug and seek care.
  • Allergic reactions such as rash, pruritus, angioedema, or anaphylaxis.
  • Depressive symptoms or suicidal ideation - notify a healthcare professional promptly.

Drug Interactions

  • CYP3A4 inducers (e.g., rifampicin, carbamazepine, phenytoin) may reduce medroxyprogesterone levels, potentially decreasing efficacy.
  • CYP3A4 inhibitors (e.g., ketoconazole, itraconazole, erythromycin) can increase plasma concentrations, raising the risk of side effects.
  • Anticoagulants (e.g., warfarin) - progestogens may enhance anticoagulant effect; monitor INR closely.
  • Hormonal contraceptives - concurrent use may alter menstrual patterns but generally does not require dosage change.

Food and Lifestyle Interactions

  • Cycrin may be taken with or without food; consistent administration with respect to meals helps maintain stable absorption.
  • Moderate alcohol consumption does not usually interfere with the drug, but excessive intake may exacerbate hepatic side effects.
  • Driving and machinery: The medication is not known to impair cognition or motor skills; however, individuals experiencing dizziness should exercise caution.

How to Take Cycrin

  • Standard dosing: The usual starting dose for most indications is 5 mg once daily. Depending on clinical response and tolerability, the dose may be increased to 10 mg once daily. The exact regimen should be prescribed by a qualified healthcare provider.
  • Administration: Swallow the tablet whole with a glass of water. If gastrointestinal upset occurs, the tablet can be taken with a small amount of food.
  • Missed dose: If you remember the missed dose within 12 hours, take it immediately. If more than 12 hours have passed, skip the missed dose and resume the regular schedule. Do not double the dose.
  • Overdose: Symptoms may include severe nausea, vomiting, menstrual abnormalities, and dizziness. Seek urgent medical attention; supportive care is the mainstay of treatment.
  • Discontinuation: For long-term therapy, a gradual taper may be advisable to minimise rebound menstrual disturbances. Follow the prescribing clinician’s advice on tapering.

Monitoring and Follow-Up

  • Baseline assessment: Prior to initiation, evaluate liver function tests, complete blood count, and a thorough history of thromboembolic disease.
  • Follow-up labs: Repeat liver function tests after 4-6 weeks of therapy, then periodically based on clinical status.
  • Clinical review: Assess bleeding patterns, menstrual regularity, and any emergence of adverse symptoms at each follow-up visit.
  • Pregnancy avoidance: Women of child-bearing potential should use effective non-hormonal contraception while on Cycrin and for at least one menstrual cycle after discontinuation.

Storage and Handling

  • Store Cycrin tablets at room temperature (15 °C-30 °C), protected from moisture and direct sunlight.
  • Keep the container tightly closed and out of reach of children.
  • Do not use the medication beyond the expiration date printed on the packaging.
  • Dispose of unused tablets according to local pharmacy take-back schemes or as directed by a pharmacist.

Medication-Specific Glossary

Progestogen
A synthetic or natural hormone that mimics the effects of progesterone, primarily used to regulate the menstrual cycle and protect the uterine lining.
Endometrial Hyperplasia
Excessive thickening of the uterine lining, often driven by unopposed estrogen, which can increase the risk of developing endometrial cancer.
CYP3A4
A liver enzyme responsible for metabolising many drugs, including medroxyprogesterone; substances that induce or inhibit this enzyme can alter drug levels.
Thromboembolism
The formation of a blood clot (thrombus) that can travel through the bloodstream and cause blockages (emboli) in vital vessels, leading to conditions such as deep-vein thrombosis or pulmonary embolism.
Hormone Replacement Therapy (HRT)
The administration of estrogen, with or without a progestogen, to alleviate menopausal symptoms and prevent osteoporosis in post-menopausal women.

Medical Disclaimer

This article provides educational information about Cycrin and is not a substitute for professional medical advice. Treatment decisions, including the use of any medication for unapproved indications, must be made under the guidance of a qualified healthcare provider. The content is intended for informational purposes only and does not constitute medical recommendations. Always consult a physician before starting, stopping, or changing any medication regimen.

Information for Cycrin is sourced from established medical standards and updated frequently. It is provided for general guidance and should be confirmed with a healthcare professional before use.
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