Package: 30 tabs (25mg/tab)

Active Substance: Mesterolone

View cart



Proviroxyl, known in the medical field as Mesterolone, is an oral medication manufactured by Kalpa Pharmaceuticals. It is a synthetic androgen and anabolic steroid, similar to the naturally occurring hormone testosterone. Mesterolone is primarily indicated for the treatment of male hypogonadism, a condition where the body does not produce enough testosterone. It is also used to treat infertility in men caused by low testosterone levels. In addition to its medical uses, Proviroxyl is widely utilized in the bodybuilding community for Post Cycle Therapy (PCT). PCT is crucial for restoring the body’s natural hormonal balance after a cycle of anabolic steroids and preventing estrogen-related side effects.


While Proviroxyl can be highly effective, it is not suitable for everyone. Key contra-indications include:

  1. Prostate Cancer: Men with a history of prostate cancer should not use Mesterolone, as it may stimulate the growth of cancerous cells.
  2. Liver Disease: Severe liver impairment can be exacerbated by the use of this medication.
  3. Breast Cancer in Men: Men with breast cancer should avoid Mesterolone due to potential tumor growth stimulation.
  4. Allergic Reactions: Individuals who have a known allergy to Mesterolone or any of its ingredients should not take this medication.
  5. Women and Children: This drug is not intended for use by women or children due to its androgenic properties.


The administration of Proviroxyl for PCT involves careful consideration of dosage and timing to ensure effectiveness and minimize risks:

  1. Dosage: For PCT purposes, the typical dosage ranges from 25 mg to 50 mg per day. The exact dosage can vary based on individual response and the specifics of the anabolic steroid cycle.
  2. Timing: Mesterolone is often introduced towards the end of the anabolic steroid cycle or immediately after the cycle has ended to help manage estrogen levels and support natural testosterone production.
  3. Cycle Length: The duration of Proviroxyl use in PCT usually lasts for 4 to 6 weeks. Prolonged use beyond this period is generally not recommended.
  4. Consistency: It is important to take Proviroxyl consistently at the same time each day to maintain stable blood levels.

Medical Action

Proviroxyl works by mimicking the actions of natural testosterone, leading to various beneficial effects, particularly during PCT:

  1. Androgenic Effects: Mesterolone binds to androgen receptors, exerting strong androgenic effects that help maintain muscle mass and strength gains achieved during a steroid cycle.
  2. Anti-Estrogenic Properties: Proviroxyl does not aromatize into estrogen, which helps prevent estrogen-related side effects such as gynecomastia (enlargement of male breast tissue) and water retention.
  3. Boosts Libido: By increasing androgen levels, Mesterolone can enhance libido and sexual performance, which can sometimes be suppressed following a steroid cycle.
  4. Supports Natural Testosterone Production: Although it does not directly stimulate testosterone production, its androgenic effects can indirectly support the recovery of natural testosterone levels by reducing the negative feedback on the hypothalamic-pituitary-gonadal axis.


Using Proviroxyl requires adherence to several precautions to ensure safe and effective use:

  1. Regular Monitoring: Regular blood tests to monitor hormone levels, including testosterone and estrogen, are crucial to adjusting the dosage and ensuring optimal outcomes.
  2. Liver Function: Since Mesterolone is metabolized by the liver, regular liver function tests are recommended to avoid potential liver damage.
  3. Prostate Health: Regular prostate exams are important, particularly for older men, to monitor any potential prostate-related issues.
  4. Individual Response: Everyone responds differently to androgens, so it is essential to monitor individual responses and adjust the dosage as necessary.
  5. Interactions: Mesterolone can interact with other medications and supplements, so it is important to consult with a healthcare provider before starting any new medications or supplements while using Proviroxyl.

Side Effects

Like any medication, Proviroxyl can cause side effects. These can range from mild to severe:

Common Side Effects

  1. Acne: Increased androgen levels can lead to acne breakouts.
  2. Hair Loss: Men predisposed to male pattern baldness may experience accelerated hair loss.
  3. Mood Changes: Some users may experience mood swings, aggression, or irritability.
  4. Oily Skin: Androgenic effects can lead to increased oil production in the skin.
  5. Increased Body Hair: Enhanced androgen levels can cause increased body hair growth.

Severe Side Effects

  1. Prostate Enlargement: Long-term use can lead to benign prostatic hyperplasia (enlarged prostate), causing urinary issues.
  2. Liver Toxicity: Although rare, high doses or prolonged use can result in liver damage or liver tumors.
  3. Cardiovascular Issues: Mesterolone can affect cholesterol levels, increasing the risk of cardiovascular diseases.
  4. Suppression of Natural Testosterone: Prolonged use can suppress natural testosterone production, leading to hormonal imbalances.
  5. Gynecomastia: Although it has anti-estrogenic properties, improper use can still lead to the development of gynecomastia.


In the case of an overdose, immediate medical attention is necessary. Symptoms of Mesterolone overdose may include:

  1. Severe Nausea and Vomiting: Excessive intake can cause severe gastrointestinal distress.
  2. Dizziness and Fainting: Overdosage can lead to extreme dizziness and potential fainting spells.
  3. Breathing Difficulties: Respiratory issues may arise in severe cases.
  4. Aggression and Mood Swings: Overdose can exacerbate mood changes, leading to extreme aggression or irritability.

Treatment for overdosage is supportive and symptomatic, focusing on stabilizing the patient and addressing specific symptoms. There is no specific antidote for Mesterolone overdose.


Proviroxyl from Kalpa Pharmaceuticals, also known as Mesterolone, is a potent oral androgen and anabolic steroid with significant applications in both medical and bodybuilding communities. While it is primarily used for treating male hypogonadism and infertility, its ability to block estrogen receptors has made it a valuable tool in Post Cycle Therapy. By maintaining high androgen levels without converting to estrogen, Mesterolone helps prevent estrogen-related side effects and supports the recovery of natural testosterone production after anabolic steroid cycles.

However, the use of Proviroxyl requires careful consideration of its contra-indications, potential side effects, and necessary precautions. Proper administration, including dosage management and monitoring hormone levels, is crucial to maximizing its benefits and minimizing risks. Regular health check-ups, a balanced diet, and a well-structured PCT plan can help users safely harness the advantages of Proviroxyl while mitigating associated risks. By adhering to these guidelines, individuals can effectively use Mesterolone to support their bodybuilding goals and maintain overall health and well-being.


There are no reviews yet.

Be the first to review “PROVIROXYL KALPA”

Popular brands


How can I get cheap business-class tickets?

How much does it cost to fly business class?

Which airlines have the best business class?

What’s the difference between premium economy and business class on international flights?

Are business class and first class the same?

What does the business class include on international flights?

has been added to your cart.