Mesterolone Tablets: Uses, Dosage, Side Effects Explained
Comprehensive guide to mesterolone tablets for treating male androgen deficiency and infertility issues effectively.
Mesterolone tablets, commonly known by the brand name Pro-Viron, are a synthetic androgen medication designed to address conditions in men caused by insufficient natural male sex hormones. This comprehensive guide covers all aspects of mesterolone, from its primary uses in treating androgen deficiency and male infertility to detailed instructions on dosage, potential side effects, and essential safety precautions. Understanding how mesterolone works can empower men experiencing hormonal imbalances to manage their health effectively under medical supervision.
| Type of medicine | An androgen (male sex hormone) |
|---|---|
| Used for | Androgen deficiency; male infertility due to low sperm count from low hormone levels |
| Also called | Pro-Viron® |
| Available as | Tablets (typically 25 mg) |
About mesterolone
Mesterolone is classified as an androgen and anabolic steroid (AAS), primarily used to treat disorders where the body produces insufficient natural androgens, such as testosterone. It functions by supplementing the male hormone levels, which can improve symptoms of hypogonadism, including low libido, reduced muscle mass, fatigue, and infertility issues like oligozoospermia (low sperm count). Developed in the early 1960s by Schering, mesterolone has been a staple treatment for male hypogonadism and related infertility, helping to restore hormonal balance without significantly converting to estrogen, unlike some other steroids.
In clinical contexts, mesterolone is particularly beneficial for men with low testosterone due to conditions like Leydig cell failure or idiopathic hypogonadism. It enhances spermatogenesis indirectly by supporting androgen levels necessary for sperm production. Research indicates it may also offer benefits in certain mood disorders, such as depression, by alleviating symptoms like anxiety and lack of drive, though this is not its primary indication. Importantly, mesterolone is rapidly absorbed orally, reaching peak serum levels quickly, making it suitable for consistent daily dosing.
Unlike testosterone replacements that can aromatize into estrogen, mesterolone has weak estrogenic activity, reducing risks like gynecomastia. However, it is not approved for bodybuilding or performance enhancement in healthy individuals, as misuse can lead to serious health risks, including liver injury.
Before taking mesterolone
Prior to starting mesterolone, a thorough medical evaluation is crucial to ensure it is appropriate for your condition. Inform your doctor if you have any of the following:
- Prostate or breast cancer: Androgens can accelerate the growth of hormone-sensitive cancers.
- Liver disease: Mesterolone has been associated with drug-induced liver injury, including jaundice in case reports of misuse.
- Epilepsy or migraine: Hormonal changes may trigger seizures or headaches.
- Diabetes: It may affect blood sugar control.
- High blood pressure or heart conditions: Treatment can elevate blood pressure and cholesterol levels.
- History of allergic reactions: Particularly to mesterolone or excipients like lactose, maize starch, or parabens.
Discuss all current medications, including over-the-counter drugs, herbal supplements, and other steroids, as interactions can occur. Your doctor will perform baseline tests, including blood hormone levels, liver function, prostate-specific antigen (PSA), and possibly sperm analysis for infertility treatment. Pregnant women should avoid handling crushed tablets due to potential virilizing effects on the fetus.
For those with infertility, mesterolone is most effective when low androgens are the root cause. It is not suitable for women or children, and off-label uses like erectile dysfunction linked to low testosterone require careful monitoring.
How to take mesterolone
Always follow your doctor’s prescription and read the patient information leaflet provided with the medication. Mesterolone tablets are typically 25 mg each, round, white, and scored, marked with a hexagon logo.
- Initial dosage: Usually 25 mg (one tablet) three to four times daily, totaling 75-100 mg per day.
- Maintenance: After a few months, the dose may be reduced to 50-75 mg daily based on response and blood tests.
- Administration: Swallow whole with water, with or without food. Take at consistent times daily to maintain steady levels.
- Missed dose: Take as soon as remembered unless near the next dose; do not double up.
Treatment duration varies: short-term for acute deficiency, longer for infertility (often 3-6 months with monitoring). Regular follow-ups include blood tests for testosterone, liver enzymes, lipids, and hematocrit.
Getting the most from your treatment
To optimize benefits and minimize risks:
- Attend all scheduled appointments for blood tests, prostate exams, and breast checks to monitor for cancer growth or other issues.
- Maintain a healthy lifestyle: balanced diet, regular exercise, and weight management, as mesterolone can increase body mass and cholesterol.
- Avoid alcohol and hepatotoxic substances to protect liver health, given reports of mesterolone-induced hepatitis.
- Do not share tablets or use for non-prescribed purposes like bodybuilding, which is ineffective and dangerous in healthy men.
- Check with a pharmacist before using over-the-counter products, though interactions are rare.
For infertility, combine with lifestyle changes like quitting smoking and reducing stress for better sperm quality outcomes.
Can mesterolone cause problems?
Like all medications, mesterolone can cause side effects, though not everyone experiences them. Most are dose-related and resemble natural androgen excess (masculinization).
| Common side effects | What to do |
|---|---|
| Headache, aches, pains | Drink water; use pharmacist-recommended painkiller. Consult doctor if persistent. |
| Nausea, abdominal pain | Eat simple foods; avoid spicy/rich meals. Seek medical advice if severe. |
| Acne, hair growth, baldness | Usually mild; monitor and report if bothersome. |
| Weight gain, high blood pressure, swollen limbs | Monitor weight/BP; inform doctor. |
| Mood changes, breast/prostate issues | Report immediately for evaluation. |
| Frequent/prolonged erections (priapism) | Urgent: Contact doctor to prevent injury. |
Serious risks include elevated cholesterol (total, LDL, triglycerides), liver toxicity (jaundice, elevated enzymes), and cardiovascular strain. Discontinue and seek help for yellowing skin/eyes, dark urine, or severe fatigue. Long-term use requires vigilant monitoring.
How to store mesterolone
Store in a cool, dry place below 25°C, away from moisture and light. Keep in original packaging until use. Do not use after expiry date. Secure from children and others, as misuse poses health risks. Dispose of unused tablets via pharmacy take-back programs.
Important information about all medicines
- Never adjust dose without medical advice.
- Report new symptoms promptly.
- For emergencies (e.g., allergic reactions: rash, swelling, breathing issues), seek immediate help.
- Medicines affect individuals differently; discuss concerns openly.
Frequently Asked Questions (FAQs)
Q: What is mesterolone primarily used for?
A: It treats androgen deficiency (low testosterone) and male infertility due to low hormone levels, improving sperm production and libido.
Q: Can mesterolone be used for erectile dysfunction?
A: It may help ED caused by low testosterone (50-150 mg/day), but it’s not first-line like PDE5 inhibitors; requires doctor supervision.
Q: Is mesterolone safe for bodybuilding?
A: No, it’s not recommended for healthy men; misuse risks liver damage and hormonal disruption.
Q: How long does it take to see results?
A: Improvements in energy/libido may occur in weeks; infertility benefits take 3-6 months with monitoring.
Q: Does mesterolone affect fertility positively?
A: Yes, in low-androgen cases, it supports spermatogenesis without suppressing natural testosterone production significantly.
References
- Drug-induced liver injury due to mesterolone: A case report — Elsevier (Gastroenterología y Hepatología). 2019-10-15. https://www.elsevier.es/en-revista-gastroenterologia-hepatologia-english-edition–382-articulo-drug-induced-liver-injury-due-mesterolone-S2444382419302354
- Mesterolone tablets – Pro-Viron — Patient.info. Recent access 2026. https://patient.info/medicine/mesterolone-tablets-pro-viron
- PROVIRON – NPS MedicineWise — NPS MedicineWise. Recent access 2026. https://www.nps.org.au/medicine-finder/proviron-tablets
- Mesterolone — DrugBank Online. Recent access 2026. https://go.drugbank.com/drugs/DB13587
- Adverse effect of the anabolic–androgenic steroid mesterolone — NIH (PMC). 2009-02-01. https://pmc.ncbi.nlm.nih.gov/articles/PMC2613982/
- Mesterolone: Uses, Interactions, Mechanism of Action — DrugBank. Recent access 2026. https://go.drugbank.com/drugs/DB13587
- What is Mesterolone used for? — Patsnap Synapse. Recent access 2026. https://synapse.patsnap.com/article/what-is-mesterolone-used-for
Similar Articles
Read full bio of Sneha Tete
