Package: 50 tabs (50mg/tab)

Active Substance: Mesterolone

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Proviron, known scientifically as Mesterolone, is an oral androgen and anabolic steroid produced by SP-Laboratories. It is primarily used to treat conditions associated with low androgen levels in men, such as hypogonadism, where the body does not produce enough testosterone. Proviron is also utilized in the bodybuilding community, particularly during Post Cycle Therapy (PCT), to help restore natural testosterone production and mitigate the side effects of anabolic steroid use. Understanding Proviron’s indications, administration, medical action, and potential side effects is crucial for anyone considering its use.


Proviron is primarily indicated for the treatment of male hypogonadism, a condition where the body fails to produce sufficient testosterone. Symptoms of hypogonadism include low libido, erectile dysfunction, fatigue, depression, and reduced muscle mass. By supplementing the body’s natural androgen levels, Proviron helps alleviate these symptoms and improve overall quality of life. In bodybuilding, Proviron is used off-label during Post Cycle Therapy. After a cycle of anabolic steroids, athletes use Proviron to help restore natural testosterone levels, prevent estrogen-related side effects, and maintain muscle gains.


Proviron is not suitable for everyone and has several contraindications. Individuals with known or suspected prostate cancer, male breast cancer, or a history of liver tumors should not use this medication. It is also contraindicated for those with severe liver disease, as Proviron can exacerbate liver dysfunction. Pregnant or breastfeeding women should avoid Proviron due to its androgenic effects. People with hypersensitivity to Mesterolone or any of its components should not use this medication. Consulting a healthcare professional before starting Proviron is essential to ensure it is safe based on your health history.


Proviron is administered orally, typically in tablet form. The dosage and duration of use depend on the individual’s condition and treatment goals. For treating hypogonadism, the usual starting dose is 25 to 50 mg taken two to three times daily. Maintenance doses are often lower, around 25 mg once or twice daily. In the context of Post Cycle Therapy, bodybuilders usually take Proviron at a dose of 25 to 50 mg per day, often starting the regimen towards the end of their steroid cycle and continuing for several weeks. It is crucial to follow the prescribed dosage and administration schedule to achieve the desired effect while minimizing potential side effects.

Medical Action

Proviron works by supplementing the body with Mesterolone, a synthetic androgen similar to testosterone. It binds to androgen receptors in various tissues, promoting the development of male characteristics and improving symptoms of low testosterone. In Post Cycle Therapy, Proviron’s ability to bind to androgen receptors helps maintain muscle mass and strength gained during a steroid cycle. Additionally, Proviron has anti-estrogenic properties, as it prevents the conversion of testosterone to estrogen, thereby reducing the risk of estrogen-related side effects such as gynecomastia and water retention.


Before starting Proviron, a thorough medical evaluation is necessary. Regular monitoring of liver function and prostate health is recommended to detect any potential adverse effects early. Individuals should inform their healthcare provider about any other medications they are taking, as Proviron can interact with certain drugs, particularly anticoagulants and other hormone treatments. It is also essential to be aware of the signs of overdosage or adverse reactions, such as persistent nausea, yellowing of the skin or eyes, or unusual fatigue, and to report any symptoms to a healthcare provider immediately.

Side Effects

Like any medication, Proviron can cause side effects. Common side effects include headache, increased libido, and acne. These symptoms are usually mild and tend to diminish with continued use. More severe side effects may include liver dysfunction, changes in liver enzymes, and jaundice. Long-term use of high doses of Proviron can lead to prostate enlargement and increased risk of prostate cancer. If any severe or persistent side effects occur, it is important to seek medical attention immediately. Regular follow-ups with a healthcare provider are crucial to monitor for any adverse effects and to adjust the treatment plan as needed.


An overdose of Proviron can lead to serious health complications. Symptoms of overdose may include severe nausea, vomiting, liver dysfunction, and changes in liver enzymes. In extreme cases, it can cause liver tumors or exacerbate prostate issues. If an overdose is suspected, it is crucial to seek emergency medical help immediately. Treatment typically involves supportive care, including monitoring of vital signs and administration of medications to counteract the effects of the overdose. Adhering strictly to the prescribed dosage and administration guidelines can prevent the risk of overdose.


Proviron from SP-Laboratories is a versatile oral medication that plays a vital role in the treatment of male hypogonadism and the management of hormonal balance during Post Cycle Therapy for bodybuilders. Its ability to supplement androgen levels and prevent estrogen-related side effects makes it an invaluable tool for achieving therapeutic and performance goals. However, it is essential to use Proviron responsibly and under the supervision of a healthcare professional. Understanding the indications, contraindications, proper administration, and potential side effects can help users maximize the benefits while minimizing risks. Always consult with a healthcare provider before starting any new medication to ensure it is appropriate for your individual health needs.


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