Danazol Capsules Guide To Uses, Dosage & Side Effects
Comprehensive guide to Danazol capsules: uses, dosage, side effects, and key precautions for endometriosis and more.
Danazol is a synthetic steroid derived from ethisterone, a modified testosterone, used primarily to treat conditions like endometriosis, fibrocystic breast disease, and hereditary angioedema. It acts as a pituitary gonadotropin inhibitor, suppressing the release of follicle-stimulating hormone (FSH) and luteinizing hormone (LH), which reduces estrogen and progesterone production.
About Danazol Capsules
Danazol capsules are available in strengths such as 50 mg, 100 mg, and 200 mg, taken orally with water. This medication is prescription-only and belongs to the class of androgen hormones. It is well-absorbed from the gastrointestinal tract, with peak plasma concentrations reached 2-8 hours after a 400 mg dose (median Tmax of 4 hours). Steady-state levels are achieved after 6 days of twice-daily dosing.
In endometriosis treatment, Danazol alters normal and ectopic endometrial tissue, making it inactive and atrophic, leading to lesion resolution in most cases. It also inhibits gonadal steroids at target organs and decreases immunoglobulin levels (IgG, IgM, IgA), aiding disease regression. For hereditary angioedema, it increases C1 esterase inhibitor (C1EI) levels, preventing swelling attacks and elevating C4 complement levels.
Changes in vaginal cytology and cervical mucus indicate suppression of the pituitary-ovarian axis. Temporary lipoprotein changes, such as decreased high-density lipoproteins (HDL) and possibly increased low-density lipoproteins (LDL), may occur, potentially raising atherosclerosis risk.
Before Taking Danazol Capsules
Check with Your Doctor or Pharmacist
Before starting Danazol, inform your doctor if you have any allergies, particularly to steroids or androgens. Discuss all medications, supplements, or herbal remedies you’re taking to avoid interactions.
Pregnancy and Breastfeeding
Danazol is contraindicated in pregnancy due to risks of fetal harm, including masculinization of female fetuses. Perform pregnancy tests before starting therapy, especially if not beginning during menstruation. Use effective non-hormonal contraception during treatment. It is not recommended during breastfeeding, as it may pass into breast milk.
Babies Under 4 Weeks Old
Danazol is not approved for use in neonates or infants under 4 weeks due to immature liver function and potential toxicity.
Having Tests and Check-Ups
Your doctor will conduct baseline tests for liver function, lipid profile, blood counts, and hormone levels. Regular monitoring every 1-3 months is essential for liver enzymes, lipids, and blood pressure during therapy. Liver ultrasound or scans may be needed for long-term use due to rare risks of peliosis hepatitis or adenomas.
How to Take Danazol Capsules
Swallow capsules whole with water, with or without food. Take exactly as prescribed, typically twice daily for endometriosis or fibrocystic breast disease, and 2-3 times daily for hereditary angioedema. Do not exceed the dose or duration without medical advice.
Dosage Instructions
Dosage varies by condition:
- Endometriosis (Mild): 200-400 mg/day in 2 divided doses for 3-6 months (up to 9 months).
- Endometriosis (Moderate/Severe): Start with 800 mg/day in 2 divided doses; taper to maintain amenorrhea.
- Fibrocystic Breast Disease: 100-400 mg/day in 2 divided doses.
- Hereditary Angioedema: 200 mg 2-3 times daily; adjust based on response, minimum effective dose.
Therapy for endometriosis should start during menstruation or after confirming non-pregnancy. Continue uninterrupted for full efficacy.
Missed a Dose
If you miss a dose, take it as soon as remembered unless near the next dose. Do not double up. Contact your doctor if multiple doses are missed.
Possible Side Effects
Danazol has androgenic and anabolic effects, leading to various side effects. Most are dose-related and reversible upon discontinuation.
Common Side Effects
These affect more than 1 in 100 people:
- Weight gain
- Acne, oily skin, or rashes
- Menstrual irregularities (spotting, amenorrhea)
- Muscle cramps, joint pain
- Flushing, sweating, vaginal dryness
- Reduced breast size, emotional lability
- Increased hair growth or voice deepening (androgenic effects)
Serious Side Effects
Seek immediate medical help for:
- Signs of liver problems: yellowing skin/eyes, dark urine, abdominal pain
- Blood clots: leg swelling/pain, chest pain, shortness of breath
- Benign intracranial hypertension: severe headaches, vision changes
- Severe allergic reactions: rash, swelling, breathing difficulty
- Peliosis hepatitis or liver tumors (rare with long-term use)
| System | Common Effects | Rare/Serious Effects |
|---|---|---|
| Endocrine | Amenorrhea, spotting, reduced estrogen effects | Pseudotumor cerebri |
| Gastrointestinal | Nausea, vomiting | Pancreatitis, splenosis |
| Musculoskeletal | Cramps, joint pain | Carpal tunnel syndrome |
| Skin | Rashes, acne | Stevens-Johnson syndrome |
| Hematologic | Increased RBC/platelets | Thrombosis |
Males may experience reduced spermatogenesis; monitor semen parameters in long-term users.
Interactions with Other Medicines
Danazol may interact with:
- Anticoagulants (e.g., warfarin): increased bleeding risk
- Oral hypoglycemics/insulin: altered glucose control
- Cyclosporine: increased nephrotoxicity
- Hormone therapies: enhanced effects
- Lipoprotein-altering drugs: amplified lipid changes
Inform your doctor of all medications.
Other Medicines and Danazol Capsules
Avoid alcohol, as it may exacerbate liver risks. Grapefruit juice can alter metabolism. Supplements like St. John’s Wort may reduce efficacy.
Common Questions About Danazol Capsules
How Does Danazol Work?
Danazol suppresses pituitary gonadotropins, reducing ovarian steroidogenesis. It binds androgen receptors, inhibits multiple enzymes, and for angioedema, boosts C1 inhibitor.
How Long Until Danazol Works?
Pain relief in endometriosis may start in weeks; full effects take 3-6 months. Angioedema prevention varies.
How Long to Take Danazol?
Typically 3-9 months for endometriosis; long-term for angioedema at lowest dose.
Can You Stop Taking Danazol Suddenly?
Taper under doctor guidance to avoid rebound symptoms.
Does Danazol Cause Weight Gain?
Yes, common due to androgenic/anabolic effects.
Does Danazol Affect Fertility?
It induces amenorrhea but fertility often returns post-therapy; persistent amenorrhea rare.
Is Danazol a Steroid?
Yes, synthetic steroid with androgenic properties.
Danazol and Alcohol
Avoid alcohol to protect liver health.
Danazol and the Contraceptive Pill
Not recommended together; use non-hormonal contraception.
Further Information
Store at room temperature, away from moisture. Dispose of unused medication properly. Report side effects to your doctor or regulatory bodies like FDA MedWatch.
Important: This information does not replace professional medical advice. Consult your healthcare provider for personalized guidance.
References
- DANAZOL capsule – DailyMed — National Library of Medicine. 2023. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=f2c9b713-aafc-49ca-866e-334d9b5c2e2d
- Danazol (oral route) – Mayo Clinic — Mayo Foundation for Medical Education and Research. 2024-05-01. https://www.mayoclinic.org/drugs-supplements/danazol-oral-route/description/drg-20067988
- Danazol Capsules: Uses & Side Effects – Cleveland Clinic — Cleveland Clinic. 2024. https://my.clevelandclinic.org/health/drugs/18343-danazol-capsules
- Danazol: MedlinePlus Drug Information — National Library of Medicine. 2023-11-15. https://medlineplus.gov/druginfo/meds/a682599.html
- Danazol – StatPearls – NCBI Bookshelf — National Center for Biotechnology Information. 2023-07-17. https://www.ncbi.nlm.nih.gov/books/NBK564344/
- Danazol: Uses, Interactions, Mechanism of Action | DrugBank — DrugBank Online. 2024. https://go.drugbank.com/drugs/DB01406
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