Molekula
Azithromycin
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 1999 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Azithromycin is a macrolide antibiotic used to treat a range of bacterial infections. It works by inhibiting bacterial protein synthesis. Available with CAS number 83905-01-5, molecular formula C38H72N2O12, and molecular weight 748.9845 g/mol. Stored at ambient temperatures. Signal word: Danger.
Molekula supplies Azithromycin in 1 g packs, from £37.08 inc. VAT. It is made or sourced to order. Every batch ships with a certificate of analysis, and safety data sheets are available in 6 languages. Larger quantities, up to multi-tonne, are quoted on request.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
On backorder — expected to ship by 5 December 2026
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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1 g — £30.90 per pack ex VAT · £37.08 inc. VAT
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | White crystalline powder |
| Water | 4.0 - 5.0% |
| Specific rotation | -45 Deg C - -49 Deg C |
| Heavy metals | ≤25ppm |
| Identification | (a) IR (b) HPLC |
| pH | 9.0 - 11.0 |
| Assay | 945 - 1030ug/mg |
| Residue on Ignition | ≤0.3% |
| Crystallinity | Meets the requirements |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Flash Point | 451 °C |
| Transport Class | 9 |
| Packing Group | III |
| Acidity | Base |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | Amorphous solid |
| Melting Point | 113-115 °C |
| Solubility (other solvents) | Soluble in ethanol and DSMO, minimally soluble in water |
| pKa | pKa = 8.5 |
| log P (octanol/water) | 4.02 |
Source: PubChem CID 447043 (HSDB, DrugBank)
Identification
| Property | Value |
|---|---|
| SKU | 20077299 |
| CAS Number | 83905-01-5 |
| IUPAC Name | (2R,3S,4R,5R,8R,10R,11R,12S,13S,14R)-11-[(2S,3R,4S,6R)-4-(dimethylamino)-3-hydroxy-6-methyloxan-2-yl]oxy-2-ethyl-3,4,10-trihydroxy-13-[(2R,4R,5S,6S)-5-hydroxy-4-methoxy-4,6-dimethyloxan-2-yl]oxy-3,5,6,8,10,12,14-heptamethyl-1-oxa-6-azacyclopentadecan-15-one |
| EC Number | 617-500-5 |
| Molecular Formula | C38H72N2O12 |
| Molecular Weight | 748.9845 |
| Exact Mass | 748.5085 |
| SMILES | CC[C@@H]1[C@@]([C@@H]([C@H](N(C[C@@H](C[C@@]([C@@H]([C@H]([C@@H]([C@H](C(=O)O1)C)O[C@H]2C[C@@]([C@H]([C@@H](O2)C)O)(C)OC)C)O[C@H]3[C@@H]([C@H](C[C@H](O3)C)N(C)C)O)(C)O)C)C)C)O)(C)O |
| InChIKey | MQTOSJVFKKJCRP-BICOPXKESA-N |
| InChI | InChI=1S/C38H72N2O12/c1-15-27-38(10,46)31(42)24(6)40(13)19-20(2)17-36(8,45)33(52-35-29(41)26(39(11)12)16-21(3)48-35)22(4)30(23(5)34(44)50-27)51-28-18-37(9,47-14)32(43)25(7)49-28/h20-33,35,41-43,45-46H,15-19H2,1-14H3/t20-,21-,22+,23-,24-,25+,26+,27-,28+,29-,30+,31-,32+,33-,35+,36-,37-,38-/m1/s1 |
| PubChem CID | 447043 |
| UN Number | UN3077 |
| REACH Code | Y110 |
| HTS Code | 2941.90.5000 |
| Tariff Code | 2941900000 |
Safety & GHS
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Serious Health Hazard
GHS08
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Hazardous to the Environment
GHS09
Hazard statements
- H317 May cause an allergic skin reaction
- H334 May cause allergy or asthma symptoms or breathing difficulties if inhaled
- H410 Very toxic to aquatic life with long lasting effects
Precautionary statements
- P260 Do not breathe dust/fume/gas/mist/vapours/spray
- P271 Use only outdoors or in a well-ventilated area
- P273 Avoid release to the environment
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P284 Wear respiratory protection
- P304+P340 IF INHALED: Remove victim to fresh air and keep at rest in a position comfortable for breathing
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Portuguese, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Quality certificates
Molekula Group is certified to ISO 9001:2015 (quality) and ISO 14001:2015 (environmental management), audited by a UKAS-accredited body. Both certificates are valid to 17 May 2028.
Synonyms
- Azasite
- Azenil
- aziromycin
- Azithrocin
- Azithromycine
- Azithromycinum
- Azitrocin
- Hemomycin
- Zithromax
- Zitromax
Frequently asked questions
What is Azithromycin used for?
Azithromycin is a macrolide antibiotic used to treat a variety of bacterial infections, including respiratory tract infections, skin infections, and sexually transmitted infections.
What is the chemical formula and molecular weight of Azithromycin?
The chemical formula is C38H72N2O12 and the molecular weight is 748.9845 g/mol.
How should Azithromycin be stored?
Azithromycin should be stored at ambient temperature, protected from moisture and light.
What grade of Azithromycin does Molekula supply?
Molekula supplies Azithromycin as a white crystalline powder with an assay of 945 - 1030 ug/mg, water content of 4.0 - 5.0%, specific rotation of -45 to -49 degrees, heavy metals of no more than 25 ppm, and residue on ignition of no more than 0.3%. Identity is confirmed by IR and HPLC.
Can Molekula supply Azithromycin in bulk quantities?
Yes, Molekula can supply Azithromycin in bulk quantities—please contact our sales team for pricing and availability.
What documentation comes with an order of Azithromycin?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS); additional documentation can be provided upon request.
Where can I buy Azithromycin?
Directly from Molekula, which lists Azithromycin in 1 g packs from £37.08 inc. VAT, with a certificate of analysis for every batch. Larger quantities are quoted on request. Molekula's offices: United Kingdom, France, Spain, Germany, Italy, United States and China.
Is Azithromycin dangerous goods for shipping?
Yes. Azithromycin ships as dangerous goods: UN3077, class 9, packing group III.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.