Knowledge Content
### 1. Mechanism of Action of Oxymetholone
Oxymetholone is a derivative of dihydrotestosterone (DHT) with a strong anabolic effect. Unlike other DHT derivatives, oxymetholone exhibits high activity in muscle tissue because it is not easily metabolized by 3α-hydroxysteroid dehydrogenase (3α-HSD), thus showing stronger anabolic activity than testosterone in animal experiments.
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### 2. Effects on muscle mass and strength
Studies have shown that oxymetholone has significant effects in improving lean body mass (LBM) and muscle strength. A study of men aged 65 to 80 years found that taking 50 mg and 100 mg of oxymetholone daily for 12 weeks increased lean body mass by 3.3 kg and 4.2 kg, respectively, and muscle strength also increased accordingly. These results suggest that oxymetholone has the potential to improve muscle mass and strength in the elderly.
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### 3. Effects on testosterone levels
Although oxymetholone has a strong anabolic effect, its effect on natural testosterone levels in the body is mainly inhibitory. As an exogenous anabolic steroid, oxymetholone inhibits the hypothalamic-pituitary-gonadal axis (HPTA) through a negative feedback mechanism, thereby reducing the production of endogenous testosterone. This inhibitory effect may lead to symptoms such as decreased libido, fatigue, and mood swings. Long-term use of oxymetholone may lead to a sustained decrease in testosterone levels, which may take weeks or months to recover even after discontinuation of the drug.
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### 4. Side effects and risks
The use of oxymetholone is accompanied by a variety of side effects and health risks, including:
- **Hepatotoxicity**: As a 17α-alkylated steroid, oxymetholone is highly toxic to the liver, and long-term use may lead to abnormal liver function.
- **Estrogen-related side effects**: Although oxymetholone is not converted into estrogen by aromatase, it may directly activate estrogen receptors, leading to problems such as male breast development and water retention.
- **Androgen-related side effects**: It may cause symptoms such as acne, hair loss, and prostate hyperplasia.
Therefore, when using oxymetholone, liver function and hormone levels should be closely monitored and used under the guidance of a doctor.
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### 5. Conclusion
Oximetholone has a significant effect in promoting muscle growth and strength improvement, but its inhibitory effect on natural testosterone levels in the body cannot be ignored. When using oxymetholone, it is necessary to weigh its potential benefits and risks and ensure that it is used under the guidance of professional medical personnel to minimize side effects and protect health.
