Molekula
Rifaximin ≥95%
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Rifaximin ≥95% is a semi-synthetic antibiotic derived from rifamycin SV, primarily used to treat gastrointestinal infections, including traveler’s diarrhea and hepatic encephalopathy. It functions by inhibiting bacterial RNA synthesis, making it effective against Gram-positive and Gram-negative bacteria. This product has a CAS number of 80621-81-4, with the molecular formula C43H51N3O11 and a molecular weight of 785.88. It must be stored between 2 to 8°C and carries a **Warning** signal word under GHS classification. Molekula supplies Rifaximin ≥95% from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
Pack sizes & pricing
Pricing on request — packs available from research to bulk quantities.
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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 | Red/ Orange crystalline powder |
| Grade | EP) 7.0 |
| Heavy metals | ≤ 20ppm |
| Identification | Conforms to reference |
| pH | 4.5 - 7.5 |
| Loss on Drying | ≤ 4.5% |
| Solubility | Almost insoluble in 0.1mol/L in Hydrochloric acid solution and water. Soluble in Methanol, Acetonitrile and Ethanol |
| Assay | ≥95.0% |
| Ethanol | ≤5000ppm |
| Dichloromethane | ≤600ppm |
| Residue on Ignition | ≤0.1% |
| Total Impurities | ≤3.0% |
| Any other impurity | ≤0.1% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | 2 to 8 °C |
| Transport Class | 9 |
| Packing Group | III |
| Acidity | Neutral |
Identification
| Property | Value |
|---|---|
| SKU | 90033162 |
| CAS Number | 80621-81-4 |
| IUPAC Name | [(7S,9E,11S,12R,13S,14R,15R,16R,17S,18S,19E,21Z)-2,15,17,36-tetrahydroxy-11-methoxy-3,7,12,14,16,18,22,30-octamethyl-6,23-dioxo-8,37-dioxa-24,27,33-triazahexacyclo[23.10.1.14,7.05,35.026,34.027,32]heptatriaconta-1(35),2,4,9,19,21,25(36),26(34),28,30,32-undecaen-13-yl] acetate |
| Molecular Formula | C43H51N3O11 |
| Molecular Weight | 785.88 |
| Exact Mass | 785.3524 |
| SMILES | C[C@H]1/C=C/C=C(\C(=O)NC2=C(C3=C(C4=C(C(=C3O)C)O[C@@](C4=O)(O/C=C/[C@@H]([C@H]([C@H]([C@@H]([C@@H]([C@@H]([C@H]1O)C)O)C)OC(=O)C)C)OC)C)C5=C2N6C=CC(=CC6=N5)C)O)/C |
| InChIKey | NZCRJKRKKOLAOJ-XRCRFVBUSA-N |
| InChI | InChI=1S/C43H51N3O11/c1-19-14-16-46-28(18-19)44-32-29-30-37(50)25(7)40-31(29)41(52)43(9,57-40)55-17-15-27(54-10)22(4)39(56-26(8)47)24(6)36(49)23(5)35(48)20(2)12-11-13-21(3)42(53)45-33(34(32)46)38(30)51/h11-18,20,22-24,27,35-36,39,48-51H,1-10H3,(H,45,53)/b12-11+,17-15+,21-13-/t20-,22+,23+,24+,27-,35-,36+,39+,43-/m0/s1 |
| PubChem CID | 6436173 |
| UN Number | UN3077 |
| REACH Code | Y110 |
| HTS Code | 2941903000 |
| Tariff Code | 2941900000 |
Safety & GHS
-
Health Hazard
GHS07
-
Serious Health Hazard
GHS08
-
Hazardous to the Environment
GHS09
Hazard statements
- H312 Harmful in contact with skin
- H332 Harmful if inhaled
- H351 Suspected of causing cancer
- H361 Suspected of damaging fertility or the unborn child
- H400 Very toxic to aquatic life
- H410 Very toxic to aquatic life with long lasting effects
Precautionary statements
- P210 Keep away from heat/sparks/open flames/hot surfaces - No smoking
- P260 Do not breathe dust/fume/gas/mist/vapours/spray
- P273 Avoid release to the environment
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P302+352 IF ON SKIN: Wash with soap and water
- P308+313 IF exposed or concerned: Get medical advice/attention
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, 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.
Synonyms
- Normix
- Rifacol
- Rifamycin L 105
- Rifamycin L 105SV
- Rifaxidin
- Rifaximina
- Rifaximine
- Rifaximinum
- Xifaxan
- Xifaxsan
Frequently asked questions
What is rifaximin ≥95% used for?
Rifaximin is primarily used as an antibiotic to treat gastrointestinal infections, including traveler’s diarrhea and hepatic encephalopathy, due to its broad-spectrum activity against Gram-positive and Gram-negative bacteria.
What is the chemical formula and molecular weight of rifaximin ≥95%?
The chemical formula is **C₄₃H₅₁N₃O₁₁**, and the molecular weight is **785.88 g/mol**.
How should rifaximin ≥95% be stored?
Store rifaximin at **2 to 8°C** in a dry, well-ventilated area, protected from light and moisture.
What purity grades of rifaximin does Molekula supply?
Molekula supplies rifaximin at a **≥95% purity grade** as standard.
Can Molekula supply rifaximin ≥95% in bulk quantities?
Yes, Molekula can provide rifaximin in bulk, with quantities tailored to your research, manufacturing, or commercial needs—contact us for specific pricing and lead times.
What documentation comes with an order of rifaximin ≥95%?
Each order includes a **Certificate of Analysis (CoA)**, **Material Safety Data Sheet (MSDS)**, and a **batch-specific quality report** to ensure compliance and traceability.
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.