Package: 1 vial (350mg/ml 10 ml)

Active Substance: Testosterone Mix

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Sustaxyl 350 from Kalpa Pharmaceuticals is a blend of testosterone esters designed to provide a sustained release of testosterone into the bloodstream. It is primarily indicated for the treatment of low testosterone levels in men, also known as hypogonadism. This condition can lead to various health issues such as fatigue, decreased libido, and loss of muscle mass. By supplementing testosterone, Sustaxyl 350 helps restore normal testosterone levels, improving overall health and well-being. Bodybuilders and athletes also use this drug off-label to enhance muscle mass, strength, and performance.


Sustaxyl 350 is not suitable for everyone. There are several contra-indications to consider before starting treatment:

  1. Pregnancy and Breastfeeding: Women who are pregnant or breastfeeding should not use Sustaxyl 350 due to the potential harm to the fetus or infant.
  2. Prostate Cancer: Men with prostate cancer should avoid this drug as it may stimulate the growth of cancer cells.
  3. Breast Cancer: Men with breast cancer should not use Sustaxyl 350 for the same reason.
  4. Severe Liver Disease: Those with significant liver impairment should avoid this medication as it can cause further liver damage.
  5. Severe Heart Disease: Individuals with severe cardiovascular conditions should not use Sustaxyl 350 due to the potential for worsening their condition.
  6. Allergic Reactions: Anyone who has had an allergic reaction to any component of Sustaxyl 350 should avoid using it.


Proper administration of Sustaxyl 350 is crucial to achieve the desired benefits while minimizing potential risks. The recommended guidelines include:

  1. Dosage: The typical dosage for men ranges from 250 mg to 750 mg per week. It is important to start with a lower dose to assess individual tolerance.
  2. Injection Site: Sustaxyl 350 should be administered via intramuscular injection, preferably in large muscle groups such as the glutes or thighs.
  3. Frequency: Due to the mix of esters with different half-lives, Sustaxyl 350 is usually injected once or twice a week to maintain stable blood levels.
  4. Cycle Length: Sustaxyl 350 cycles typically last between 10 to 12 weeks. Longer cycles should be avoided to reduce the risk of adverse effects.
  5. Stacking: This drug can be stacked with other anabolic steroids to enhance muscle-building effects. However, stacking should be done cautiously and under professional guidance to avoid complications.

Medical Action

Sustaxyl 350 contains a blend of four different testosterone esters, each with a unique half-life, providing both immediate and sustained release of testosterone. These esters include:

  1. Testosterone Propionate: This is a short-acting ester that provides an immediate boost of testosterone, enhancing muscle growth and strength.
  2. Testosterone Phenylpropionate: This ester has a slightly longer half-life than propionate, providing sustained testosterone levels.
  3. Testosterone Isocaproate: With a moderate half-life, isocaproate helps maintain steady testosterone levels over a longer period.
  4. Testosterone Decanoate: This is a long-acting ester that ensures prolonged release of testosterone, reducing the frequency of injections.

The combination of these esters creates a synergistic effect, providing a steady and sustained release of testosterone. This helps maintain stable blood levels, promoting consistent muscle growth, improved strength, and enhanced athletic performance.


Using Sustaxyl 350 requires adherence to several precautions to ensure safe and effective use:

  1. Regular Monitoring: Regular blood tests to monitor liver function, cholesterol levels, and hormone levels are essential to avoid potential complications.
  2. Liver Health: Since some testosterone esters can be hepatotoxic, users should avoid alcohol and other substances that can strain the liver. Taking liver support supplements like milk thistle can be beneficial.
  3. Cholesterol Levels: Sustaxyl 350 can negatively impact cholesterol levels, so maintaining a heart-healthy diet rich in omega-3 fatty acids is important.
  4. Prostate Health: Regular prostate exams are advised for men, particularly older individuals, to monitor for any potential prostate-related issues.
  5. Hydration: Staying well-hydrated is important to support overall health and minimize the risk of muscle cramps and kidney strain.
  6. Individual Response: Users should start with a lower dose to assess individual tolerance and response to the drug.

Side Effects

While Sustaxyl 350 is effective for muscle growth and performance enhancement, it can cause side effects ranging 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. Joint Pain: Some users report joint pain or discomfort.

Severe Side Effects

  1. Liver Toxicity: Prolonged use or high doses can lead to liver damage, including liver tumors or hepatitis.
  2. Cardiovascular Issues: Sustaxyl 350 can negatively affect cholesterol levels, increasing the risk of cardiovascular diseases such as heart attacks or strokes.
  3. Suppression of Natural Testosterone: Long-term use can suppress natural testosterone production, leading to hormonal imbalances and requiring Post Cycle Therapy (PCT).
  4. Gynecomastia: Improper use can lead to the development of gynecomastia, which is the enlargement of male breast tissue.
  5. Hypertension: Increased blood pressure can occur, necessitating regular monitoring and management.


In the case of an overdose, immediate medical attention is necessary. Symptoms of Sustaxyl 350 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. Liver Damage: Overdose can exacerbate liver toxicity, leading to serious liver conditions.

Treatment for overdosage is supportive and symptomatic, focusing on stabilizing the patient and addressing specific symptoms. There is no specific antidote for Sustaxyl 350 overdose.


Sustaxyl 350 from Kalpa Pharmaceuticals, a mix of testosterone esters, offers significant benefits for muscle growth and athletic performance enhancement. The blend of short, medium, and long-acting esters ensures a sustained release of testosterone, promoting consistent muscle gains, improved strength, and enhanced physical performance. By promoting protein synthesis, nitrogen retention, and red blood cell production, Sustaxyl 350 helps users achieve their bodybuilding goals.

However, the use of Sustaxyl 350 requires careful consideration of its contra-indications, potential side effects, and necessary precautions. Proper administration, including dosage management and regular health monitoring, is crucial to maximizing its benefits and minimizing risks. Regular health check-ups, a balanced diet, and liver support supplements can help users safely harness the advantages of Sustaxyl 350 while mitigating associated risks. By adhering to these guidelines, individuals can effectively use Sustaxyl 350 to support their bodybuilding goals and maintain overall health and well-being.


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