Danazol

Danazol – Comprehensive Patient Guide for Australia

Basic Product Information

Mechanism of Action

For Patients: Danazol is a type of synthetic hormone. It works by affecting the way your body makes certain natural hormones, which can help to reduce symptoms in a variety of hormone-related conditions.
For Specialists: Danazol suppresses the pituitary-ovarian axis by inhibiting gonadotropin secretion (both luteinising hormone and follicle stimulating hormone). It also has weak androgenic, progestogenic, and anti-oestrogenic activity, directly affecting endometrial tissue and immune response.

Pharmacokinetics

• Absorption: Danazol is well absorbed orally; bioavailability is improved when taken with food.
• Metabolism: Undergoes extensive hepatic (liver) metabolism to several active and inactive metabolites.
• Elimination: Mainly via urine (as metabolites), some via faeces.
• Duration of Action: Peak plasma levels within 2-8 hours. Elimination half-life is approximately 15-18 hours.

Use in Everyday Life and Best Practices

Danazol is most frequently used in the management of endometriosis, breast cysts, and prevention of hereditary angioedema attacks. Always take Danazol exactly as your doctor prescribes. Your dose and duration will depend on your condition and response to therapy, and the treatment is usually started during your menstrual cycle for some indications.

• Capsules are usually taken once or twice daily.
• Swallow capsules whole, with a full glass of water.
• Try to take your dose at the same time each day for best results.
• Do not suddenly stop treatment unless advised by your doctor.

Dosing in the Morning vs Evening

• Danazol can be taken once or twice daily, morning and/or evening.
• Some patients find taking it in the evening helpful if mild nausea or dizziness occurs.
• Maintaining a regular schedule helps maintain consistent drug levels in the blood.
• If you miss a dose, take it as soon as you remember unless it's nearly time for your next dose—do not double-up.

Taking with Food or on an Empty Stomach

• Taking Danazol with food increases absorption, especially with meals containing healthy fats (such as olive oil, avocado or fish, common in the English diet).
• If taken on an empty stomach, less medicine may be absorbed, which might reduce its effectiveness.
• Patients are encouraged to maintain a balanced, healthy diet as recommended in English dietary guidelines.

Interaction Warnings

Indications

Dosing According to Clinical Indication

Safety Profile and Side Effects

Warnings: Danazol is not recommended during pregnancy or breastfeeding. It may affect liver function and blood lipids, requiring regular blood tests. It can also affect fertility (which is typically reversible after stopping).

Guidelines for Proper Use (Pharmacist/Clinic Advice)

• Always take Danazol exactly as prescribed. Do not adjust the dose without your doctor’s advice.
• Report any signs of jaundice, dark urine, unusual bruising, difficulty breathing, or severe headaches immediately.
• Use effective contraception during treatment and for at least 1 month after stopping Danazol.
• Attend all scheduled blood tests (liver function, cholesterol, blood counts).
• Inform your pharmacist about all medicines you are taking, including over-the-counter and herbal products.
• Talk to your doctor if you plan to have surgery or require general anaesthesia.
• If you are of childbearing age, ensure you are not pregnant before starting treatment.
• Store Danazol at room temperature, out of the reach of children.

Alternative Treatment Options

• GnRH agonists (e.g. leuprorelin, goserelin): Effective in endometriosis; may cause menopausal symptoms. Usually PBS-subsidised for severe disease.
• Progestins (e.g. medroxyprogesterone, norethisterone): Alternative for endometriosis, often fewer androgenic effects; available on prescription.
• Oral contraceptives: Common first-line therapy in endometriosis and menstrual disorders.
• Tranexamic acid: Used for menorrhagia, not for endometriosis.
• C1-inhibitor concentrates: Used for hereditary angioedema, may be preferred in children and pregnancy.
• Each alternative carries its own advantages and disadvantages regarding side effect profile, eligibility, and cost. Danazol may be preferred where other treatments are unsuitable or not tolerated.

Legal, Registration, and Reimbursement Status in Australia

• TGA Approval: Danazol is registered in Australia by the Therapeutic Goods Administration (TGA).
• Prescription Status: Schedule 4 (Prescription Only Medicine); requires a valid medical script.
• PBS Status: Danazol is not PBS-listed for all indications; check with your pharmacist or doctor for eligibility criteria regarding rebates or special access programs. Some patients receive reimbursement on clinical indications like hereditary angioedema.
• Regulatory Oversight: The Australian Government’s Department of Health and Aged Care monitors Danazol’s safety, efficacy, and supply.

Latest Research & Clinical Guidance (2022–2025)

• Recent English clinical guidelines suggest that Danazol is reserved for cases where first-line hormonal therapies are not effective or not tolerated (see: RCOG, NICE).
• Long-term use is discouraged due to risk of liver complications; lowest effective dose for the shortest period is recommended (Smith et al., 2022, The Lancet).
• Emerging therapies for hereditary angioedema (e.g. lanadelumab, subcutaneous C1-inhibitors) may provide alternatives with fewer adverse effects (Australian Prescriber, 2023).
• Routine monitoring of liver function, cholesterol, and blood pressure remains standard of care (NHS England, 2024).
• References:
  • Royal College of Obstetricians and Gynaecologists [RCOG] Green-top Guidance 2023
  • National Institute for Health and Care Excellence [NICE] NG73, 2024 Update
  • Australian Prescriber, Vol 46, 2023
  • The Lancet, Smith et al., 2022

Availability and Delivery

Danazol is available in most English community and hospital pharmacies.

*Prices subject to variation; check with local pharmacy. Larger pack sizes may be dispensed for long-term users or on specialist script.

Most pharmacies offer express options for urgent supply (surcharges may apply).

Frequently Asked Questions (FAQ)

1. Can Danazol be taken during pregnancy?
   No, Danazol must not be used during pregnancy as it may harm the developing fetus. Use reliable contraception during treatment. If you become pregnant, tell your doctor immediately.
2. Will Danazol affect my menstrual periods?
   Yes, Danazol often causes irregular periods or stops them entirely. This is expected and usually reverses after stopping the medicine.
3. Is Danazol suitable for children?
   Danazol is rarely used in children and only under strict specialist supervision, mainly for hereditary angioedema. Growth and development must be closely monitored.
4. Are there dietary restrictions with Danazol?
   No special foods are prohibited, but taking Danazol with food (including healthy fats) helps its absorption. Balanced English dietary habits are recommended.
5. What should I do if I experience side effects?
   Report any concerning or severe side effects to your doctor or pharmacist promptly. Do not stop taking the medicine without medical advice unless you have a serious reaction.

For further advice, always speak to your local pharmacist, clinic nurse, or prescribing doctor. This information should be used as a guide and does not replace medical consultation.