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Products Description

### Anavar (Oxandrolone) API powder systematically explained

Anavar (Oxandrolone) is an anabolic steroid (Anabolic Androgenic Steroid, AAS). Since it was first launched by the American pharmaceutical company Searle (now Pfizer) in 1964, it has attracted much attention in the medical and specific non-medical fields due to its unique pharmacological properties and low risk of side effects. This article will systematically analyze the detailed information of Anavar API powder from the aspects of chemical properties, pharmacological effects, synthesis process, application fields, quality standards and market status.

### 1. Chemical properties and basic information

#### 1. **Basic chemical parameters**

- **Generic name**: Oxandrolone

- **Trade name**: Anavar (the most famous brand), Lonavar, Vasorome

- **Chemical name**: 17β-Hydroxy-17α-methyl-2-oxa-5α-androstan-3-one

- **CAS number**: 53-39-4

- **Molecular formula**: C₁₉H₃₀O₃

- **Molecular weight**: 306.44 g/mol

- **Structural characteristics**:

Structural modification based on the testosterone skeleton:

- Substitution of the oxygen atom at the second carbon (forming a lactone ring) → Enhanced metabolic stability;

- Methylation at the 17α position → Reduced hepatic first-pass effect and improved oral bioavailability;

- 5α reduction → Reduced androgenic activity.

#### 2. **Physical properties**

- **Appearance**: White or off-white crystalline powder, odorless or slightly characteristic odor.

- **Melting point**: 150-154°C (high-purity APIs are usually ≥152°C).

- **Solubility**:

- Slightly soluble in water (about 0.1 mg/mL, 25°C);

- Easily soluble in organic solvents (such as ethanol, chloroform, DMSO);

- Good dispersibility in lipid carriers, suitable for oral preparations.

- **Stability**: Light-sensitive, need to be stored away from light; long-term stability under dry conditions (humidity ≤30%).

### 2. Pharmacological effects and clinical advantages

#### 1. **Core pharmacological mechanism**

- **Anabolic effect**:

By binding to androgen receptor (AR), it activates gene transcription, promotes protein synthesis and muscle growth.

- **Anti-catabolic effect**:

Inhibits the binding of cortisol to glucocorticoid receptors and reduces muscle breakdown.

- **Low androgenic activity**:

Due to the 5α-reduced structure, its androgenic activity is only 1/6 of testosterone, which is suitable for female and pediatric patients.

#### 2. **Clinical advantages**

- **Liver safety**:

No C17α alkylation (only 17α methyl), liver toxicity is significantly lower than other oral steroids (such as stanozolol).

- **Lipid metabolism friendly**:

Less impact on high-density lipoprotein (HDL), lower cardiovascular risk.

- **Wide gender applicability**:

The incidence of masculinization side effects (such as deep voice, hirsutism) after use in women is less than 5%.

- **Dosage flexibility**:

The therapeutic window is wide, the common dosage range for adults is 5-20 mg/day, and children are adjusted by 0.1 mg/kg.

#### 3. **Side effects and contraindications**

- **Common side effects**:

- Mild increase in liver enzymes (reversible);

- Dyslipidemia (need to monitor HDL/LDL);

- Acne, hair loss (related to individual sensitivity).

- **Serious risks**:

- Long-term abuse may lead to cholestatic hepatitis;

- Inhibit endogenous testosterone secretion (PCT support required).

- **Contraindicated groups**:

Patients with prostate cancer, breast cancer, and severe liver and kidney dysfunction are prohibited.

### 3. Synthesis process and API production

#### 1. **Overview of synthesis route**

The industrial synthesis of Anavar usually starts with **dehydroepiandrosterone (DHEA)** or **androstenedione**. The key steps include:

1. **Epoxidation**: Introduce oxygen atoms to form a lactone ring;

2. **Methylation**: Protect the 17α-methyl group to enhance oral activity;

3. **Reduction and purification**: Remove double bonds by catalytic hydrogenation and purify by crystallization.

#### 2. **Process challenges**

- **Stereoselectivity control**: Ensure 5α-reduced configuration to avoid the formation of 5β isomers (reduced activity);

- **Impurity control**: Residues of intermediates (such as epoxy derivatives) need to be monitored, and HPLC purity must be ≥99.5%;

- **Green chemistry optimization**: Reduce the use of heavy metal catalysts (such as palladium) and use biocatalysis instead.

#### 3. **API specifications**

- **Purity standard**:

- Main component ≥99.0% determined by HPLC;

- Single impurity ≤0.5%, total impurities ≤1.0%.

- **Residual solvent**:

Meet ICH Q3C guidelines, methanol <3000 ppm, ether <500 ppm.

- **Microbial limits**:

Must meet the requirements of sterile API (terminal sterilization or aseptic process required).

### 4. Application areas and formulation development

#### 1. **Medical use**

- **Burn rehabilitation**:

Promote protein synthesis and shorten hospital stay (FDA approved indication).

- **HIV-related wasting syndrome**:

Increase lean body mass and improve quality of life (sufficient clinical trial evidence).

- **Osteoporosis**:

Assists in increasing bone density, especially for glucocorticoid-induced bone loss.

- **Children's growth disorders**:

Used for Turner syndrome and chronic malnutrition (strict dosage monitoring is required).

#### 2. **Non-medical applications (controversial areas)**

- **Competitive sports**:

Listed as a banned substance by WADA, but due to the short detection window (3-4 weeks), there is abuse.

- **Fitness and muscle building**:

Due to its low water and sodium retention characteristics, it is favored by bodybuilders, but the risk of illegal use is high.

#### 3. **Preparation form**

- **Oral tablets**: 2.5 mg, 10 mg specifications, commonly used excipients include lactose and magnesium stearate;

- **Customized capsules**: Common in the gray market, with a high risk of dosage instability;

- **Transdermal gel**: An experimental dosage form that can reduce the first-pass effect of the liver.

### 5. Quality standards and regulatory requirements

#### 1. **International Pharmacopoeia Standards**

- **USP-NF**:

Specifies infrared spectroscopy (IR) and TLC for identification, and ultraviolet spectrophotometry for content determination.

- **EP**:

Requires relevant substance inspection (HPLC-UV method), heavy metals ≤ 20 ppm.

- **JP**:

Dissolution test (30-minute release ≥ 80%).

#### 2. **GMP Compliance**

- API production must comply with FDA/EMA GMP standards, including:

- Three-stage air filtration system (ISO 8 clean area);

- Full process quality traceability system;

- Stability test (accelerated 6 months, long-term 24 months).

#### 3. **Import and export control**

- **United States**: DEA lists it as a Schedule III controlled substance;

- **China**: Strictly regulated in accordance with the Regulations on the Administration of Narcotic Drugs and Psychotropic Substances;

- **EU**: A special import license is required (such as Italy's DM 11/2011).

###6. Market status and manufacturer analysis

#### 1. **Global supply chain**

- **Original drug**: Pfizer holds the original patent, but it has expired in most countries;

- **Major API production countries**:

- **India**: Such as Symbiosis Labs and Dragon Pharma, with low cost but uneven quality;

- **China**: Many companies in Hubei and Jiangsu have passed FDA on-site inspections and supply high-purity raw materials;

- **Europe**: Some Italian companies focus on GMP-grade raw materials, which are expensive.

#### 2. **Price Trend**

- **Price of API**:

- Industrial grade (95% purity): $2,000-3,500/kg;

- Pharmacopoeia grade (≥99%): $8,000-12,000/kg;

- Custom synthesis (GMP standard): ≥$15,000/kg.

- **Influencing factors**:

Fluctuations in prices of raw materials (such as DHEA), stricter environmental regulations, and the rise of cryptocurrency payments.

#### 3. **Future Trend**

- **Demand growth points**:

Expansion of medical markets in emerging countries, off-label use in anti-aging clinics;

- **Challenges**:

Countries strengthen steroid legislation and competition from biosimilars (such as selective androgen receptor modulators).

### Conclusion

Anavar API continues to play a role in specific medical fields due to its unique chemical structure and relatively mild side effects, but the health and social problems caused by its non-medical abuse cannot be ignored. In the future, with the advancement of precision medicine and synthetic biology technology, improved derivatives or new delivery systems of Oxandrolone may further expand its application boundaries, but it is necessary to balance innovation and safety under a strict regulatory framework.