Trimethoprim

When sourcing Trimethoprim (CAS No. 738-70-5), buyers must ensure the product complies with international pharmacopoeia standards such as USP (United States Pharmacopeia), BP (British Pharmacopoeia), or EP (European Pharmacopoeia). Key technical parameters include an assay purity of 98.5% to 101.0%, strictly controlled impurity profiles (e.g., Impurity A and B), and specific particle size distributions (micronized vs. non-micronized) depending on the final dosage form. Always request a Certificate of Analysis (COA) for every batch to verify these metrics.

As an Active Pharmaceutical Ingredient (API), the supplier must possess a GMP (Good Manufacturing Practice) certificate. For entry into regulated markets, look for suppliers with a CEP (Certificate of Suitability) or an active DMF (Drug Master File) number. Additionally, ensure the manufacturer is registered with the relevant local health authority (e.g., FDA for the US or EDQM for Europe) and can provide a Written Confirmation (WC) for export if required.

Trimethoprim is primarily used as an antibacterial agent for treating urinary tract infections. In veterinary and human medicine, it is frequently formulated in a 1:5 ratio with Sulfamethoxazole to create Co-trimoxazole, which provides a synergistic effect. Buyers should confirm the solubility profile and bulk density to ensure compatibility with their specific tableting or encapsulation machinery.

The primary risk involves regulatory seizure if the product lacks proper documentation. Ensure the supplier provides a Safety Data Sheet (SDS) and that the HS Code (2933.59) is correctly declared. Because it is a controlled medical substance in many regions, you must verify your import license requirements before the goods leave the port to avoid heavy fines or destruction of the cargo.

Focus negotiations on batch consistency and long-term stability data rather than just the lowest price. Request a pre-shipment sample (PSS) that is representative of the actual commercial lot. For large volumes, negotiate staggered payment terms (e.g., 30% deposit, 70% against BL) and utilize secured payment services provided by the platform to mitigate financial risk.

Trimethoprim is light-sensitive and should be stored in tight, light-resistant containers. During cross-border shipping, ensure the packaging consists of double-layer PE bags inside fiber drums. Specify that the cargo must be kept in a cool, dry environment (below 30°C) and away from strong oxidizing agents to prevent chemical degradation during long sea voyages.