Package: 30 tabs (2,5mg/tab)

Active Substance: Letrozole

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Letroxyl, known as Letrozole, is an oral medication produced by Kalpa Pharmaceuticals. It is primarily prescribed for the treatment of hormonally-responsive breast cancer in postmenopausal women. Letrozole is classified as an aromatase inhibitor, which works by reducing the production of estrogen in the body. This reduction is crucial for slowing the growth of estrogen-dependent breast cancer cells. However, Letrozole has found an additional application in the bodybuilding community, particularly in Post Cycle Therapy (PCT). PCT is a critical phase after anabolic steroid cycles where the goal is to restore the body’s natural hormone production and prevent estrogen-related side effects.


While Letroxyl is effective for its intended uses, it is not suitable for everyone. The main contra-indications include:

  1. Pregnancy and Breastfeeding: Letrozole can harm an unborn baby and should not be used by women who are pregnant or breastfeeding.
  2. Pre-menopausal Women: Letrozole is intended for postmenopausal women only, as it can interfere with normal hormonal functions in pre-menopausal women.
  3. Allergy to Letrozole: Individuals who have a known allergy to Letrozole or any of its components should avoid using this medication.
  4. Severe Liver Disease: Letrozole is metabolized by the liver, and severe liver impairment can lead to serious complications.


The administration of Letroxyl for PCT involves careful dosing and timing to maximize its benefits and minimize potential risks:

  1. Dosage: For PCT purposes, bodybuilders typically take 0.5 mg to 2.5 mg of Letrozole daily. The exact dosage depends on the severity of estrogen rebound and individual response.
  2. Timing: Letrozole is often introduced towards the end of an anabolic steroid cycle or immediately after to manage estrogen levels effectively.
  3. Cycle Length: The duration of Letrozole use in PCT can vary but generally lasts for 2 to 4 weeks. Prolonged use beyond this period can lead to excessive estrogen suppression.
  4. Monitoring: Regular monitoring of hormone levels is recommended to adjust the dosage accordingly and ensure optimal outcomes.

Medical Action

Letroxyl works by inhibiting the enzyme aromatase, which is responsible for converting androgens into estrogen. By blocking this conversion, Letrozole effectively reduces estrogen levels in the body. Here is a closer look at its mechanisms and effects:

  1. Estrogen Reduction: Lowering estrogen levels helps prevent estrogen-related side effects such as gynecomastia (development of breast tissue in men) and water retention, which are common after anabolic steroid use.
  2. Hormone Balance: By reducing estrogen, Letrozole helps restore the balance between testosterone and estrogen, facilitating the recovery of natural testosterone production.
  3. Anti-Catabolic Effect: Maintaining higher testosterone levels while reducing estrogen can prevent muscle loss, which is crucial during the PCT phase.


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

  1. Hormone Levels: Regular blood tests to monitor hormone levels, including estrogen and testosterone, are essential to adjust the dosage and avoid over-suppression of estrogen.
  2. Liver Health: Since Letrozole is processed by the liver, users with pre-existing liver conditions should use this drug cautiously and under medical supervision.
  3. Bone Health: Long-term use of Letrozole can lead to bone density loss. Incorporating calcium and vitamin D supplements can help mitigate this risk.
  4. Cholesterol Levels: Letrozole can negatively impact lipid profiles, increasing the risk of cardiovascular diseases. A heart-healthy diet and regular exercise are recommended.
  5. Interactions: Letrozole can interact with other medications, including hormone replacement therapies and certain supplements. Consulting a healthcare provider before combining it with other treatments is advised.

Side Effects

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

Common Side Effects

  1. Hot Flashes: A common side effect due to hormonal changes.
  2. Joint and Muscle Pain: Some users report aches and pains in their joints and muscles.
  3. Fatigue: Letrozole can cause feelings of tiredness or weakness.
  4. Headaches: Frequent headaches may occur, especially during the initial stages of use.
  5. Nausea: Mild nausea or stomach discomfort is also reported by some users.

Severe Side Effects

  1. Bone Density Loss: Prolonged use can lead to osteoporosis or weakened bones.
  2. Cardiovascular Issues: Letrozole can negatively affect cholesterol levels, increasing the risk of heart disease.
  3. Liver Dysfunction: Though rare, severe liver issues can occur, necessitating regular liver function tests.
  4. Mood Changes: Some users may experience mood swings, depression, or anxiety.
  5. Vision Changes: Rarely, Letrozole can cause vision disturbances.


In the case of an overdose, immediate medical attention is necessary. Symptoms of Letrozole 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. Bone Pain: Intensified bone or joint pain may occur.

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


Letroxyl from Kalpa Pharmaceuticals, known as Letrozole, is a potent aromatase inhibitor with significant applications in both medical and bodybuilding communities. While it is primarily used for treating hormonally-responsive breast cancer in postmenopausal women, its ability to reduce estrogen levels has made it a valuable tool in Post Cycle Therapy for bodybuilders. By lowering estrogen, Letrozole helps prevent estrogen-related side effects and supports the recovery of natural testosterone production after anabolic steroid cycles.

However, the use of Letroxyl requires careful consideration of its contraindications, 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 Letroxyl while mitigating associated risks. By adhering to these guidelines, individuals can effectively use Letrozole to support their bodybuilding goals and maintain overall health and well-being.


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