© 2026 Sinochem Nanjing Corporation,
All Right Reserved
Azithromycin Dihydrate comes forward as a well-known broad-spectrum macrolide antibiotic, regularly counted on in the treatment of respiratory tract, skin, and soft tissue infections. The substance is recognized by its chemical strength and its specific physical properties that drive its appeal for both pharmaceutical manufacturers and healthcare professionals. Known for its high degree of stability and longer half-life, this antibiotic is valued for tackling pathogens that resist conventional treatments. The full chemical name is 9-deoxo-9a-aza-9a-methyl-9a-homoerythromycin A dihydrate. On the inside, its molecule features a 15-membered lactone ring, which marks its classification within the macrolide family. The dihydrate form distinguishes itself with two water molecules embedded in the crystal lattice, which impact its handling, storage, and application in pharmaceutical settings.
The molecular formula often cited for Azithromycin Dihydrate is C38H72N2O12·2H2O. Its molecular weight, including the hydration, reaches 785.0 g/mol. The structure relies on a macrocyclic lactone ring, which grants the compound both its therapeutic properties and its physical resilience. The crystalline structure reflects these rings stacked through hydrogen bonding from the dihydrate segment, and this plays a role in solubility profiles and impacts absorption in medicines. Chemists often look at the arrangement of atoms and the location of the nitrogen group to explain the unique behavior of azithromycin in suspension or solution form.
The compound usually appears as a white or nearly white crystalline powder. In practical terms, it feels dry to the touch and carries no distinctive odor. Azithromycin Dihydrate resists melting under normal laboratory conditions, signaling significant thermal stability, which aids drug formulation processes. Its true density lands near 1.37 g/cm³. The substance holds low solubility in water—most pharmacists and researchers notice only about 2 mg per mL dissolving at room temperature—while it performs better in acidic or methanolic solutions. Water of hydration adds mass and affects flow properties, so some batches arrive as loose flakes, while others pack tight as fine powders with a pearly sheen under direct light. This form helps with bulk packaging, reduces dusting during measurement, and makes the material somewhat less prone to static cling, which matters on the production line.
Standard raw azithromycin dihydrate supplied for pharmaceutical production holds purity levels above 97%, confirmed by high-performance liquid chromatography. Quality assurance tests zero in on residual solvents, related impurities, and valid water content to maintain efficacy and safety. The white appearance signals little to no coloring agents or byproducts, and quality control labs run checks for heavy metals and microbial contamination, seeing as the material is destined for human healthcare use. Specific surface area, particle size distribution, and bulk density round out the typical physical profile and influence tablet formation, capsule filling, and match dosing guidelines necessary for effective therapy.
Azithromycin Dihydrate takes shape as a solid bulk powder most of the time. Flakes show up in some batches, their thin, almost sheet-like form stems from crystal growth during synthesis. Fine powder dominates industrial packaging to make automated weighing and blending direct. Pearls, or slightly granulated forms, see rare use except in specific oral suspensions. Liquid or solution forms come only from factory mixing with water or buffer for injectable or pediatric drops. Crystal form, at the raw production step, helps define the purity and bulk stability of the compound. Of most practical interest is the powder, which handles well, stores easily, and keeps stability when sealed from moisture and heat.
The Harmonized System (HS) Code for Azithromycin Dihydrate as a chemical substance mostly falls under 2941.90, classified for antibiotics but subject to national subdivisions and controls. Import-export rules stress product identification, purity, batch origin, and intended use in pharmaceutical manufacture. Labeling requirements direct hazard communication and safe transport. The safety data sheet (SDS) will flag the need for careful handling, even though the powder is less volatile than many industrial chemicals.
Azithromycin Dihydrate rates as both a safe medicine and a regulated chemical raw material. Exposure at manufacturing scale sometimes brings minor health risks if mishandled—a dust cloud can cause eye, skin, or respiratory irritation. Chronic exposure, though rare in non-pharmaceutical settings, can lead to allergic or immune reactions in sensitive people. Pharmaceutical-grade product usually avoids contamination with persistent organic pollutants or heavy metals, but strict adherence to Occupational Safety and Health Administration (OSHA) rules and pharmaceutical good manufacturing practice (GMP) is expected during its storage and handling. Spills should be swept up gently, with breathing protection and gloves to prevent direct contact. Waste from this substance cannot just hit the regular trash—environmental controls require disposal as pharmaceutical or laboratory waste, following national and local regulations.
As a raw material, Azithromycin Dihydrate pulls its weight at the front lines of antibiotic production. Pharmaceutical companies prize its stability and storage properties, as many other antibiotics break down faster under the same conditions. Doctors prescribe azithromycin to treat bacterial infections resistant to more common agents, so reliable, pure, stable raw material translates directly into successful patient treatment. The compound slips into dose forms like tablets, capsules, oral suspensions, or injections after blending and granulation with excipients. Supplied as a dry solid, it remains potent over long shelf lives, supporting global logistics and wide distribution. Attention to maintaining strict, reproducible physical properties keeps patients, regulators, and manufacturers satisfied that every batch can do the job promised.
Secure supply chains for raw azithromycin help avoid shortages faced during global health crises. Partnerships with certified manufacturers, frequent audits, and transparency in sourcing raw ingredients reduce the risk of adulterated or impure chemicals entering the market. Improving personal protective equipment and engineering controls in manufacturing sites reduces the risks of dust exposure and accidental inhalation for workers. Clear and complete safety documentation, with real-world training for staff, turns handling from a rote compliance task to an effective safeguard. Sustainable practices, such as minimizing production waste and recycling packaging, make the process safer for both people and the environment. Research into alternative forms—such as more water-soluble salts—may make the compound easier to handle in regions with less access to high-end processing equipment.
