\
Active Pharmaceutical Ingredient

Erythromycin Stearate API Manufacturer & Supplier in India

Also known as: Erythromycin Octadecanoate; Erythromycin Stearic Acid Salt; Bristamycin; Ethril

CAS: 643-22-1 Macrolide Antibiotic IP / BP / EP / USP GMP Certified Aurangabad, Maharashtra, India
Erythromycin Stearate API — Mediocon Inc, Aurangabad Maharashtra India
Erythromycin Stearate — Pharmaceutical Grade API | Mediocon Inc, Aurangabad, Maharashtra, India

Product Overview

CAS No: 643-22-1  |  MF: C₃₇H₆₇NO₁₃  |  MW: 733.94 g/mol

Erythromycin Stearate is the stearate salt form of Erythromycin, a macrolide antibiotic derived from Saccharopolyspora erythraea. It exerts its antibacterial activity by inhibiting bacterial protein synthesis through reversible binding to the 50S ribosomal subunit, thereby blocking the translocation step of peptide chain elongation. Mediocon Inc supplies pharmaceutical-grade Erythromycin Stearate conforming to IP / BP / EP / USP specifications.

The stearate salt form offers enhanced stability compared to Erythromycin Base, protecting the acid-labile macrolide from gastric degradation. It is absorbed in the upper small intestine and hydrolysed to free Erythromycin, delivering the same broad-spectrum antibacterial activity against Gram-positive organisms, atypical pathogens, and selected Gram-negative bacteria.

Key Features

  • High-purity pharmaceutical grade API (Assay NLT 93.0%)
  • IP / BP / EP / USP pharmacopoeial compliance
  • Full CoA, MSDS/SDS, and COO documentation per batch
  • GMP-certified manufacturing facility in Aurangabad, Maharashtra
  • Stable stearate salt form — superior acid stability vs. base
  • White to slightly yellow crystalline powder — consistent appearance

Therapeutic Applications

  • Upper and lower respiratory tract infections (community-acquired pneumonia, bronchitis)
  • Skin and soft tissue infections caused by susceptible organisms
  • Sexually transmitted infections — chlamydia, syphilis (penicillin alternative)
  • Diphtheria prophylaxis and treatment
  • Legionnaire's disease and Mycoplasma pneumoniae infections
  • Acne vulgaris (topical and systemic regimens)
  • Pertussis (whooping cough) — prophylaxis and treatment

Industrial & Formulation Uses

  • Film-coated tablet formulations — most common oral dosage form
  • Reference standard for analytical and pharmacopoeia testing
  • Veterinary antibiotic preparations
  • Raw material for semi-synthetic macrolide derivatives

Why Choose Mediocon

  • ISO 9001:2015 & WHO-GMP certified manufacturing
  • Consistent batch-to-batch quality — HPLC-verified assay every lot
  • Export-ready documentation: COO, MSDS, DMF support
  • Flexible MOQ: 1 kg (R&D sample) to 500+ kg commercial lots
  • Dedicated QA team for regulatory filings (US FDA, EMA, TGA)
  • Competitive pricing with short lead times from Aurangabad facility

Product Specifications

Product NameErythromycin Stearate
Also Known AsErythromycin Octadecanoate; Erythromycin Stearic Acid Salt; Bristamycin; Ethril
CAS Number643-22-1
Molecular FormulaC₃₇H₆₇NO₁₃
Molecular Weight733.94 g/mol
CategoryMacrolide Antibiotic
AppearanceWhite to slightly yellow crystalline powder
OdourSlight, characteristic
SolubilitySlightly soluble in water; freely soluble in alcohol, chloroform, and ether
Melting Point135–140 °C
StorageStore below 25 °C, in a dry place, protected from light
GradeIP / BP / EP / USP
HS Code29419090

Analytical Specifications

Parameter Specification (BP/USP)
Assay (Erythromycin)NLT 93.0% (dried basis)
Erythromycin A contentNLT 85.0% of total erythromycin
Loss on DryingNMT 3.0% (60 °C, 3 h, in vacuo)
Specific Optical Rotation−68° to −78° (c=1, ethanol)
Stearic Acid ContentNLT 32.0% and NMT 38.0%
Heavy MetalsNMT 20 ppm
Residue on IgnitionNMT 0.2%
Related SubstancesErythromycin B NMT 5.0%; C NMT 3.0%
Microbial LimitsComplies with pharmacopoeia
IdentificationIR, HPLC Compliant
Mfg DateMAR 2025
Exp DateFEB 2028
Packing25 kg HDPE drums / aluminium foil bags / as per requirement

Sourcing, Regulatory & Export Information

Mediocon Inc is a GMP-certified API manufacturer and bulk pharmaceutical ingredient supplier based in Aurangabad, Maharashtra, India. We specialise in supplying Erythromycin Stearate (CAS 643-22-1) and over 1,000 other Active Pharmaceutical Ingredients, excipients, herbal extracts, and nutraceutical ingredients to pharmaceutical manufacturers worldwide.

Our Erythromycin Stearate is manufactured under strict quality management protocols compliant with WHO-GMP, ISO 9001:2015, and major pharmacopoeial standards (IP, BP, USP, EP). Every batch undergoes full analytical testing — identity (IR/HPLC), assay, related substances (Erythromycin A/B/C), residual solvents (ICH Q3C), heavy metals, and microbial limits — before release with a Certificate of Analysis.

Export Markets

  • USA — FDA-registered facility; DMF support available for ANDA/NDA filings
  • Europe — EMA-compliant documentation; CEP/EDMF support on request
  • Africa & Middle East — WHO-GMP certified; competitive pricing for emerging markets
  • Southeast Asia — established logistics network; temperature-controlled shipments
  • India domestic — Schedule H compliance; all state licensing documentation provided

Quality & Compliance

  • ISO 9001:2015 certified quality management system
  • WHO-GMP certified manufacturing facility, Aurangabad, Maharashtra
  • Full batch traceability — raw material to finished API
  • Stability data available (ICH Q1A guidelines) for regulatory submissions
  • Dedicated QA team for customer audits and regulatory queries
  • Microbiological testing per USP <61> / <62> / BP 2.6.12

Frequently Asked Questions — Erythromycin Stearate API

What is the minimum order quantity for Erythromycin Stearate API?
Mediocon Inc supplies Erythromycin Stearate with a minimum order quantity of 1 kg (sample packs available for R&D). We accommodate both small R&D quantities and large commercial-scale orders. Contact our sales team at akshay@mediocon.com or +91 9309999757 for a tailored quote.
What pharmacopoeial grades of Erythromycin Stearate does Mediocon supply?
We supply Erythromycin Stearate conforming to IP / BP / EP / USP pharmacopoeial standards. Each batch is tested against full pharmacopoeial specifications and released with a Certificate of Analysis. Custom specifications can be accommodated for regulated markets.
What documentation is provided with Erythromycin Stearate API?
Every shipment comes with: Certificate of Analysis (CoA), MSDS/SDS, Certificate of Origin (COO), and Drug Master File (DMF) support on request. We also provide GMP certification, ISO 9001:2015 compliance documentation, and full regulatory support for filings in USA (FDA), Europe (EMA), and other markets.
What is the lead time and shipping for Erythromycin Stearate bulk orders?
Standard lead time is 2–4 weeks for standard orders; expedited shipments possible for urgent requirements. We ship to 40+ countries worldwide using approved pharmaceutical-grade packaging (25 kg HDPE drums / aluminium foil bags). Temperature-controlled logistics available where required.
Is Erythromycin Stearate the same as Erythromycin Base?
Erythromycin Stearate (CAS 643-22-1) is the stearate salt of Erythromycin Base (CAS 114-07-8). The salt form provides improved stability against gastric acid. After absorption, it is hydrolysed to free Erythromycin, delivering the same antibacterial activity. Mediocon Inc supplies both Erythromycin Base and Erythromycin Stearate — contact us for specifications.
💬
Mediocon AI
Hello 👋 How can I help you today?