Allopregnanolone Powder

Allopregnanolone powder is an endogenous neurosteroid, a natural metabolite of progesterone. It potently and positively allosterically modulates GABA-A receptors, rapidly producing sedative, anxiolytic, and antidepressant effects. Its intravenous formulation has been approved by the FDA for the treatment of postpartum depression. This product is a white to off-white crystalline powder with a purity typically ≥98% (HPLC detection). Its molecular formula is C₂₁H₃₄O₂, and its molecular weight is 318.49 g/mol. It is a lipid-soluble steroid compound, practically insoluble in water, but soluble in organic solvents such as ethanol and DMSO. The powder should be stored in a cool, dry place; for long-term storage, it is recommended to keep it at -20°C.

In clinical settings, Allopregnanolone powder (administered intravenously as Brexanolone) is a breakthrough therapy for postpartum depression. Research has revealed its subjective effects across multiple dimensions:

1. Rapid Antidepressant and Mood Improvement
The most remarkable feature is its speed of onset. While conventional antidepressants typically take weeks to show effects, intravenous Brexanolone can significantly improve postpartum depression symptoms within hours. Patients often describe the experience as a rapid sense of relief from long-standing feelings of depression, emptiness, or anxiety.

2. Profound Sedation and Somnolence
This is the most direct and noticeable sensation for the vast majority of users. Studies in healthy women confirm that allopregnanolone dose-dependently increases feelings of sedation and causes a reduction in saccadic eye movement velocity-a reliable biomarker for sedation. A pilot study using an oral analog (ganaxolone) for depression found that all subjects experienced somnolence and fatigue, with 60% experiencing dizziness.

3. Soothing Anxiolytic Calm
Animal models have long confirmed its potent anxiolytic effects, which can be blocked by GABA-A receptor antagonists, validating its mechanism of action. A recent 2026 study further elucidated that in stressed mice, the anxiolytic effects of allopregnanolone are linked to the restoration of neuronal activity and synaptic plasticity in the prefrontal cortex and hippocampus.

For a clear comparison across subjective dimensions and supporting research evidence, please see the table below:

• Synthetic Route: Starting with phytosterols, a multi-step chemical reaction (semi-synthetic method) is used for targeted synthesis to ensure precise molecular structure.
• Purification Process: Through multi-stage solvent extraction and repeated recrystallization, impurities and isomers are effectively removed, ensuring the HPLC purity of the finished product is ≥ 98%.
• Drying Treatment: Low-temperature vacuum drying (40-50℃) is used to avoid high-temperature damage to crystal properties, and the moisture content is strictly controlled.
• Pulverization and Granulation: Airflow pulverization is performed according to formulation requirements to control the uniformity of particle size in the finished product.
• Homogeneous Mixing: The entire batch of powder is thoroughly mixed to ensure uniform quality throughout the batch.
• Clean Packaging: Automated filling is performed in a Class 100,000 cleanroom, using pharmaceutical-grade double-layer PE bags + aluminum foil light-proof sealing.
• Automated Monitoring: A PLC central control system monitors key parameters such as reaction temperature, time, and pressure throughout the process, with traceable records.
• Standardized Operation: First-line operations strictly adhere to SOPs to ensure batch-to-batch consistency.

1. Team Strength and Equipment
Leveraging Xi'an's academic resources, we have a 30+ member R&D team with advanced degrees in steroid chemistry and chiral synthesis. Equipped with preparative/analytical HPLC, LC-MS/MS, GC-MS, and polarimeters, we perform precise structural confirmation, chiral impurity analysis, and full physicochemical characterization for Allopregnanolone Powder, ensuring reliable batch-to-batch quality.

2. Custom Formulation and Process Optimization
To address Allopregnanolone's high lipophilicity and poor water solubility, we offer custom solubilization solutions, including nano-encapsulation, cyclodextrin inclusion, and lipid-based delivery systems. We can also tailor particle size and bulk density for specific routes of administration (e.g., injection, oral, or transdermal). Our process team utilizes DoE to refine the semi-synthetic pathway, improving target yield while minimizing by-products.

3. Stability Studies and Continuous Innovation
Given Allopregnanolone Powder 's sensitivity to light, moisture, and heat, we follow ICH guidelines to conduct accelerated, long-term, and forced degradation stability studies. We closely track degradation products and polymorphic changes, providing accurate shelf-life data and storage recommendations. Our R&D team continues to explore greener catalysts and more efficient synthesis routes, ensuring long-term cost and quality competitiveness.