Suzhou Pharmaceutical Technology Co., Ltd. (China) supplies Clarithromycin API CAS 81103-11-9 for pharmaceutical B2B procurement — COA, MSDS, and technical documentation available on request.
> Clarithromycin API — Overview
Clarithromycin (CAS: 81103-11-9, also known as claritromicina, 6-O-methylerythromycin, Klacid active ingredient, Biaxin active ingredient, and clarithromycin Form II) is a macrolide API used in formulation, analytical-development, and research programs where local regulations permit. Suzhou Pharmaceutical Technology Co., Ltd. supplies Clarithromycin API in controlled small-batch and bulk quantities from Suzhou, China, with export to South America, Australia, New Zealand, Mexico, Canada, and worldwide markets. Export documentation: COA and MSDS standard for all orders.
| Product Name | Clarithromycin |
| Structural Formula |  |
| Alias | Claritromicina; 6-O-methylerythromycin; Klacid active ingredient; Biaxin active ingredient; Clarithromycin Form II |
| CAS Number | 81103-11-9 |
| Molecular Formula | C38H69NO13 |
| Molecular Weight | 748.0 g/mol |
| Purity | Available by agreed HPLC specification |
| Appearance | White to off-white crystalline powder |
| Storage | Store sealed, protected from moisture and strong light |
> Applications
Clarithromycin is used by pharmaceutical and research organizations developing macrolide formulations, reference methods, and impurity-control strategies. API supply is intended for qualified buyers who will confirm dosage form, microbiological control strategy, impurity requirements, pharmacopoeial approach, and finished-dose registration obligations in their own markets.
Macrolide formulation research
A 2005 Current Medical Research and Opinion journal article reported a randomized investigator-blinded study evaluating clarithromycin extended-release and amoxicillin/clavulanate in acute bacterial sinusitis research (Curr Med Res Opin, doi:10.1185/030079904X18009, n=437). This supports the need for carefully controlled Clarithromycin API quality in macrolide formulation and analytical-development programs.
Analytical and impurity-control development
Buyers typically evaluate assay, related substances, residual solvents, water content, identity, polymorphic form, microbial limits, and stability behavior before moving from sample quantities to pilot or commercial batches. We supply API only, not finished tablets, capsules, oral suspensions, compounded products, or branded medicines.
> Sourcing & Supply
Suzhou Pharmaceutical Technology Co., Ltd. is an R&D-driven pharmaceutical company with in-house synthesis and analytical capability for Clarithromycin API. Small batches (up to 10 kg) are produced directly by our technical team in Suzhou. For larger commercial quantities, production is scaled up at qualified manufacturing facilities, with export documentation provided according to the order scope.
- Small-batch orders (≤10 kg): prepared by our technical team in Suzhou. Lead time 10–14 business days from order confirmation.
- Commercial bulk (>10 kg): scaled up at qualified manufacturing facilities. Lead time 14–21 business days depending on batch size and documentation.
We export Clarithromycin API to buyers across South America — including Brazil, Argentina, Colombia, Chile, Peru, Ecuador, Bolivia, Paraguay, and Uruguay — as well as to Australia, New Zealand, Mexico, and Canada. Inquiries from European, Middle Eastern, and Asian markets are also welcome.
> Quality & Export Documentation
All Clarithromycin shipments are accompanied by a Certificate of Analysis (COA) confirming identity, appearance, assay, and related substances against batch specification. Purity is tested by HPLC against an authenticated reference standard. MSDS is provided for all orders, and Certificate of Origin (COO) is available for commercial bulk shipments.
| Order size | Documentation included |
| ≤10 kg (small-batch / research) | COA + MSDS |
| >10 kg (commercial bulk) | COA + MSDS + COO |
> Packaging & Logistics
- 100 g, 500 g: double-layered aluminium foil bag, heat-sealed
- 1 kg: aluminium foil bag inside kraft paper box
- 5 kg, 10 kg: aluminium foil bag inside fibre drum
- >10 kg: packaging agreed according to commercial order requirements
Clarithromycin API is shipped with moisture-protective packaging and batch labels matched to the COA. Shipping options include express courier for samples, air freight for kilogram orders, and sea freight for larger commercial shipments where timing allows.
> Pricing & Supply
Clarithromycin pricing is provided on request. We do not publish list prices because the final quote depends on order quantity, purity requirement, documentation needs, shipping destination, and current raw material costs.
- MOQ: 100 g for qualified buyers
- Sample policy: 10–50 g samples available for analytical confirmation
- Bulk discount tiers apply at 500 g, 1 kg, 5 kg, and 10 kg
- Payment: T/T (bank transfer). 100% in advance for standard orders. Terms for larger repeat orders by arrangement.
> Frequently Asked Questions
What is the minimum order quantity for Clarithromycin API?
The minimum order quantity for Clarithromycin API is 100 grams. Sample quantities of 10–50 g are available for qualified buyers.
What documents are included with a Clarithromycin bulk order?
All Clarithromycin orders include a COA and MSDS in English. For commercial bulk orders above 10 kg, COO is available as standard export documentation.
Can I request a Clarithromycin sample before placing a bulk order?
Yes. Sample quantities of 10–50 g are available for qualified buyers before pilot or commercial orders.
Do you export Clarithromycin API to South America?
Yes. We support inquiries from Brazil, Argentina, Colombia, Chile, Peru, Ecuador, Bolivia, Paraguay, and Uruguay.
Can buyers in Australia, New Zealand, Mexico, or Canada order Claritromicina?
Yes. We supply Clarithromycin API to buyers in Australia, New Zealand, Mexico, and Canada. COA and MSDS are included with all orders.
What is Clarithromycin used for?
Clarithromycin is a macrolide API used in formulation, analytical-development, and research programs where local regulations allow.
Is Biaxin active ingredient the same as Clarithromycin?
Yes. Biaxin active ingredient is a commercial-context synonym for Clarithromycin; we supply API, not branded finished medicine.
What specification is available for Clarithromycin CAS 81103-11-9?
Clarithromycin is supplied by agreed HPLC specification, including assay, related substances, residual solvents, water content, identity, salt-form controls, and microbial limits when required.
How is Clarithromycin packaged and shipped internationally?
Clarithromycin API is shipped in foil bags or foil-lined fibre drums with protection from moisture and strong light during international transit.
Do you supply finished Clarithromycin tablets, capsules, or suspensions?
No. We supply Clarithromycin API, not finished tablets, capsules, oral suspensions, compounded products, or branded medicines.
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> Request a Quote or Sample
To request a quote or sample for Clarithromycin API (CAS 81103-11-9), please contact us directly at Info@fmyykj.com.
Include in your inquiry: required quantity (grams or kg), destination country, documentation requirements (COA + MSDS standard; COO for bulk), and intended use (formulation / analytical development / research / other). We respond to all inquiries within 1 business day.
Last reviewed: June 2026