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PROVIRON 25 mg TABLETS

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Talk to a doctor about this medicine

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This page is for general information. Consult a doctor for personal advice. Call emergency services if symptoms are severe.
About the medicine

How to use PROVIRON 25 mg TABLETS

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This page provides general information and does not replace a doctor’s consultation. Always consult a doctor before taking any medication. Seek urgent medical care if symptoms are severe.

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Introduction

Package Leaflet: Information for the User

Proviron 25 mg Tablets

mesterolone

Read all of this leaflet carefully before you start taking this medicine because it contains important information for you.

  • Keep this leaflet. You may need to read it again.
  • If you have any further questions, ask your doctor or pharmacist.
  • This medicine has been prescribed for you only. Do not pass it on to others. It may harm them, even if their signs of illness are the same as yours.
  • If you get any side effects, talk to your doctor or pharmacist. This includes any possible side effects not listed in this leaflet. See section 4.

Contents of the pack

  1. What Proviron is and what it is used for
  2. What you need to know before you take Proviron
  3. How to take Proviron
  4. Possible side effects
  5. Storage of Proviron
  6. Contents of the pack and other information

1. What Proviron is and what it is used for

Doctor consultation

Not sure if this medicine is right for you?

Discuss your symptoms and treatment with a doctor online.

Androgen/testosterone deficiency must be clearly demonstrated before initiating treatment with androgens (male hormones), excluding other diseases that may explain these symptoms.

Proviron is a medicine that contains mesterolone, a form of androgen (male hormone).

It is used in men who have insufficient production of male hormones (androgens).

It is also used in men with fertility problems due to low levels of male hormones caused by hypogonadism or inadequate testicular function.

2. What you need to know before you take Proviron

Do not take Proviron

  • If you are allergic to mesterolone or any of the other ingredients of this medicine (listed in section 6).
  • If you have prostate cancer.
  • If you have an enlarged prostate (benign prostatic hyperplasia)
  • If you have or have had a liver tumor.
  • If you are a man and have breast cancer

Proviron is not indicated for use in children and adolescents. There is no available information on the use of Proviron in minors under 18 years of age.

Proviron is not indicated for use in women.

Warnings and precautions

Consult your doctor or pharmacist before starting to take Proviron.

Substance abuse and dependence

Follow exactly the administration instructions of Proviron as indicated by your doctor or pharmacist.

Do not use Proviron for bodybuilding, to increase muscle mass in healthy men, or to increase other physical abilities, either alone or with other anabolic-androgenic steroids, as this carries serious health risks, such as heart and blood vessel problems (which can be fatal) and liver and/or mental health problems, as well as the possibility of developing dependence on these drugs.

Proviron is for use in male patients only.

During treatment with Proviron, you will undergo periodic prostate exams to rule out any cancerous process, as Proviron may increase the growth rate of this type of cancer.

With the use of hormonal substances like the one contained in Proviron, benign liver tumors have been rarely observed, and in very rare cases, malignant liver tumors. In isolated cases, these liver tumors have caused intra-abdominal bleeding with a risk to life. If you notice any unusual discomfort in the stomach or persistent pain, inform your doctor immediately.

Frequent or persistent erections may occur. In some cases, the dose should be reduced or treatment interrupted to avoid penile injury.

Use in athletes

This medicine contains mesterolone, which may produce a positive result in doping tests.

Other medicines and Proviron

Tell your doctor or pharmacist if you are using, have recently used, or might use any other medicines, including those obtained without a prescription. Certain medicines may interact with mesterolone, so in these cases, your doctor should adjust the dose or interrupt treatment with one of the medicines.

This is especially important when taking:

  • medicines to treat infections (antibiotics such as clarithromycin or erythromycin)
  • medicines to treat seizures (antiepileptics)
  • medicines to treat fungal infections (antifungals such as voriconazole, fluconazole)
  • medicines to treat high blood pressure such as verapamil
  • antidepressants such as fluvoxamine or bupropion
  • other androgens
  • oral anticoagulants
  • medicines to treat diabetes (oral hypoglycemics or insulin)
  • corticotropin (hormone that stimulates the secretion of corticosteroids) or corticosteroids
  • cyclosporin (medicine used to prevent organ or bone marrow transplant rejection)
  • thyroxine
  • neuromuscular blockers (such as vecuronium)
  • any hepatotoxic substance (affecting liver function)

Pregnancy, breastfeeding, and fertility

Proviron is not indicated for use in women and should not be used in pregnant or breastfeeding women.

Proviron improves sperm formation, increasing the chances of reproduction.

Consult your doctor or pharmacist before using any medicine.

Driving and using machines

No effects on the ability to drive or use machines have been observed.

Proviron contains lactose, methyl parahydroxybenzoate, and propyl parahydroxybenzoate

If your doctor has told you that you have an intolerance to certain sugars, consult with them before taking this medicine.

It may cause allergic reactions (possibly delayed).

Medicine questions

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Discuss your symptoms and treatment with a doctor online.

3. How to take Proviron

Follow exactly the administration instructions of this medicine as indicated by your doctor. In case of doubt, consult your doctor or pharmacist again.

The recommended dose is one tablet 3 or 4 times a day.

The tablets should be swallowed whole, with a little water.

If you think that the effect of Proviron is too strong or too weak, inform your doctor.

When you have been taking Proviron for a few months, depending on your symptoms, your doctor may reduce the number of tablets you need to take per day.

If you take more Proviron than you should

If you have taken more Proviron than you should, consult your doctor or pharmacist immediately. In case of accidental ingestion, consult your doctor or pharmacist immediately or call the Toxicology Information Service, phone 91 562 04 20, indicating the medicine and the amount ingested.

If you forget to take Proviron

Do not take a double dose to make up for forgotten doses. Take the dose that corresponds to you and continue normally with the treatment.

If you have any other questions about the use of this medicine, ask your doctor or pharmacist.

4. Possible side effects

Like all medicines, this medicine can cause side effects, although not everybody gets them.

Tell your doctor if you notice any change in your general condition during treatment with Proviron.

Not known: the frequency cannot be estimated from the available data.

  • Abdominal pain (stomach discomfort)
  • Acne
  • Alopecia (hair loss)
  • Headache
  • Benign and malignant liver tumors
  • Frequent erections of the penis
  • Priapism (prolonged and unwanted erections of the penis)

Reporting of side effects

If you experience any side effects, talk to your doctor or pharmacist, even if it is possible side effects not listed in this leaflet. You can also report them directly through the Spanish Medicines and Health Products Agency's website: www.notificaram.es. By reporting side effects, you can help provide more information on the safety of this medicine.

5. Storage of Proviron

Keep this medicine out of the sight and reach of children.

Do not use this medicine after the expiry date which is stated on the carton after EXP. The expiry date refers to the last day of the month shown.

Medicines should not be disposed of via wastewater or household waste. Return any unused medicine to your usual pharmacy. Ask your pharmacist how to dispose of medicines no longer required. This will help protect the environment.

6. Contents of the pack and other information

Composition of Proviron

  • The active substance is mesterolone. Each tablet contains 25 mg of mesterolone.
  • The other ingredients are lactose monohydrate, corn starch, povidone 25000 (E1201), methyl parahydroxybenzoate (E218), propyl parahydroxybenzoate (E216), and magnesium stearate (E572).

Appearance and packaging of the product

Proviron 25 mg is presented in the form of white, round tablets. Each pack contains 20 tablets.

Marketing authorisation holder

Bayer Hispania, S.L.

Av. Baix Llobregat, 3-5

08970 Sant Joan Despí (Barcelona)

Spain

Manufacturer

Bayer Weimar GmbH & Co KG

Weimar

99427 - Germany

Bayer AG

Muellerstrasse 178

13353, Berlin-Germany

Date of last revision of this leaflet:01/2023

Detailed information on this medicine is available on the website of the Spanish Agency for Medicines and Health Products (AEMPS) http://www.aemps.gob.es/

Online doctors for PROVIRON 25 mg TABLETS

Discuss questions about PROVIRON 25 mg TABLETS, including use, safety considerations and prescription review, subject to medical assessment and local regulations.

5.0 (3)
Doctor

Tomasz Grzelewski

Dermatology 21 years exp.

Dr Tomasz Grzelewski is an MD, PhD specialist in allergy, paediatrics, general practice and sports medicine, with a clinical focus on dermatology, endocrinology, allergology and sports-related health. He has more than 20 years of clinical experience and completed his medical training at the Medical University of Łódź, where he defended his PhD thesis with distinction. His doctoral research was recognised by the Polish Society of Allergology for its innovative contribution to the field. Throughout his career, he has gained extensive expertise in diagnosing and managing a wide range of allergic and paediatric conditions, including modern allergen desensitisation techniques.

For five years, Dr Grzelewski served as the Head of two paediatric departments in Poland, managing complex clinical cases and leading multidisciplinary teams. He also worked in medical centres in the United Kingdom, gaining experience across both primary care and specialist environments. With over a decade of telemedicine experience, he has provided online consultations across Europe and is valued for his clear, structured and evidence-based medical guidance.

Dr Grzelewski is actively involved in clinical programmes focused on modern anti-allergic therapies. As a Principal Investigator, he leads research projects on sublingual and oral allergen desensitisation, supporting evidence-based progress in allergy treatment for both children and adults.

In addition to his background in allergology and paediatrics, he completed dermatology studies through the Cambridge Education Group (Royal College of Physicians of Ireland) and a Clinical Endocrinology course at Harvard Medical School. This advanced training enhances his ability to manage skin manifestations of allergies, atopic conditions, urticaria, endocrine-related symptoms and complex immunological reactions.

Patients commonly seek his care for:

  • seasonal and perennial allergies
  • allergic rhinitis and chronic nasal symptoms
  • asthma and breathing difficulties
  • food and medication allergies
  • urticaria, atopic dermatitis and skin reactions
  • recurrent infections in children
  • sports-related health questions
  • general family medicine concerns
Dr Tomasz Grzelewski is known for his clear communication style, structured medical approach and ability to explain treatment options in a concise and accessible way. His multidisciplinary background across allergy, paediatrics, dermatology and endocrinology allows him to provide safe, up-to-date and comprehensive care for patients of all ages.
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Doctor

Giorgi Eremeishvili

Urology 22 years exp.

Giorgi Eremeishvili is a top-category urologist, a Candidate of Medical Sciences, and a licensed physician in Spain. He provides expert assistance in the diagnosis and treatment of a wide range of urological conditions in both men and women, employing a comprehensive approach and evidence-based principles.

Key areas of expertise:

  • Erectile dysfunction, decreased libido, premature ejaculation.
  • Male infertility: comprehensive diagnosis and modern treatment methods.
  • Prostate gland diseases: acute and chronic prostatitis, prostatic adenoma (benign prostatic hyperplasia), prostate cancer.
  • Inflammatory diseases of the genitourinary system: acute and chronic cystitis, pyelonephritis, epididymitis, orchitis, urethritis.
  • Sexually transmitted infections (STIs): chlamydia, ureaplasmosis, mycoplasmosis, gardnerellosis, candidiasis, herpetic infections, HPV, CMV, trichomoniasis, and others.
  • Urination disorders: urinary retention, frequent urination, urinary incontinence, overactive bladder, neurogenic bladder.
  • Neoplasms: cysts, tumors of the kidneys, bladder, testicles, prostate gland (including prostate cancer).
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Dr. Eremeishvili applies an integrated approach to each case. This includes thorough preoperative preparation, postoperative observation, and regular dynamic follow-up during the treatment process to achieve the best possible outcomes. All diagnostic and therapeutic recommendations are based on current evidence-based medicine and comply with the recommendations of the European Association of Urology, guaranteeing high-quality and effective care.

If you are seeking qualified assistance in diagnosing or treating urological conditions, book an online consultation with Dr. Giorgi Eremeishvili. Get expert support, accurate diagnosis, and a personalized treatment plan from the comfort of your home.

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Doctor

Anna Biriukova

General medicine 6 years exp.

Dr Anna Biriukova is an internal medicine doctor with clinical experience in cardiology, endocrinology, and gastroenterology. She provides online consultations for adults, offering expert medical support for heart health, hormonal balance, digestive issues, and general internal medicine.

Cardiology – Diagnosis and treatment of:

  • High blood pressure, blood pressure fluctuations, and cardiovascular risk prevention.
  • Chest pain, shortness of breath, arrhythmias (tachycardia, bradycardia, palpitations).
  • Leg swelling, chronic fatigue, reduced exercise tolerance.
  • EKG interpretation, lipid profile evaluation, cardiovascular risk assessment (heart attack, stroke).
  • Post-COVID-19 cardiac monitoring and care.
Endocrinology – Diabetes, thyroid, metabolism:
  • Diagnosis and management of type 1 and type 2 diabetes, and prediabetes.
  • Individual treatment plans including oral medications and insulin therapy.
  • GLP-1 therapy– modern pharmacological treatment for weight management and diabetes control, including drug selection, monitoring, and safety follow-up.
  • Thyroid disorders – hypothyroidism, hyperthyroidism, autoimmune thyroid diseases (Hashimoto’s, Graves’ disease).
  • Metabolic syndrome – obesity, lipid disorders, insulin resistance.
Gastroenterology – Digestive health:
  • Abdominal pain, nausea, heartburn, gastroesophageal reflux (GERD).
  • Stomach and intestinal conditions: gastritis, irritable bowel syndrome (IBS), indigestion.
  • Management of chronic digestive disorders and interpretation of tests (endoscopy, ultrasound, labs).
General internal medicine and preventive care:
  • Respiratory infections – cough, colds, bronchitis.
  • Lab test analysis, therapy adjustments, medication management.
  • Adult vaccinations – planning, contraindications assessment.
  • Cancer prevention – screening strategies and risk assessment.
  • Holistic approach – symptom relief, complication prevention, and quality of life improvement.
Dr Biriukova combines internal medicine with specialist insight, offering clear explanations, personalised treatment plans, and comprehensive care tailored to each patient.
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€60
5.0 (29)
Doctor

Dmytro Horobets

Family medicine 7 years exp.

Dr. Dmytro Horobets is a licensed family medicine physician in Poland, specialising in endocrinology, diabetology, obesity management, gastroenterology, pediatrics, general surgery, and pain medicine. He offers online consultations for adults and children, providing personalised medical support for a wide range of acute and chronic health concerns.

Areas of expertise:

  • Endocrinology: diabetes type 1 and type 2, prediabetes, thyroid disorders, metabolic syndrome, hormonal imbalance.
  • Obesity medicine: structured weight management plans, nutritional counselling, obesity-related health risks.
  • Gastroenterology: acid reflux (GERD), gastritis, irritable bowel syndrome (IBS), liver and biliary conditions.
  • Pediatric care: infections, respiratory symptoms, digestive issues, growth and development monitoring.
  • General surgery support: pre- and post-surgical consultations, wound care, rehabilitation.
  • Pain management: chronic and acute pain, back pain, joint pain, post-traumatic pain syndromes.
  • Cardiovascular health: hypertension, cholesterol control, risk assessment for heart disease.
  • Preventive medicine: regular check-ups, health screenings, long-term management of chronic conditions.

Dr. Horobets combines evidence-based medicine with a patient-centred approach. He carefully evaluates each patient’s medical history and symptoms, offering clear explanations and structured treatment plans adapted to individual needs.

Whether you need help managing diabetes, tackling weight-related health issues, interpreting lab results, or receiving general family medicine support, Dr. Horobets provides professional online care tailored to your specific health goals.

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€60

Frequently Asked Questions

Is a prescription required for PROVIRON 25 mg TABLETS?
PROVIRON 25 mg TABLETS requires a prescription in Spain. You can check with a doctor online whether this medicine may be appropriate for your situation.
What is the active substance in PROVIRON 25 mg TABLETS?
The active ingredient in PROVIRON 25 mg TABLETS is mesterolone. This information helps identify medicines with the same composition but different brand names.
How much does PROVIRON 25 mg TABLETS cost in pharmacies?
The average pharmacy price for PROVIRON 25 mg TABLETS is around 4 EUR. Prices may vary depending on the manufacturer and dosage form.
Who manufactures PROVIRON 25 mg TABLETS?
PROVIRON 25 mg TABLETS is manufactured by Bayer Hispania S.L.. Pharmacy brands and packaging may differ depending on the distributor.
Which doctors can assess the use of PROVIRON 25 mg TABLETS online?
Doctors such as Family doctors, Psychiatrists, Dermatologists, Cardiologists, Endocrinologists, Gastroenterologists, Pulmonologists, Nephrologists, Rheumatologists, Hematologists, Infectious disease physicians, Allergists, Geriatricians, Paediatricians, Oncologists may assess whether PROVIRON 25 mg TABLETS is appropriate, depending on your situation and local regulations. You can book an online consultation to discuss your symptoms and possible next steps.
What are the alternatives to PROVIRON 25 mg TABLETS?
Other medicines with the same active substance (mesterolone) include ITNOGEN 2% GEL, REANDRON 1000 mg/4 ml INJECTABLE SOLUTION, TESTAVAN 20 mg/g TRANSDERMAL GEL. These may have different brand names or formulations but contain the same therapeutic ingredient. Always consult a doctor before switching or starting a new medicine.
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