 Home > Active Pharmaceutical Ingredients > Antipyretic Analgesics > Oseltamivir phosphate for Sale > API Oseltamivir phosphate

API Oseltamivir phosphate buy - large image1

API Oseltamivir phosphate

TDS 5 Inquiries

Unit Price: Get Latest Price 

CAS No.:

204255-11-8

Grade:

Pharmaceutical Grade

Content:

99%

Port:

shanghai

Brand:

Hyper Chem

Packaging:

20kg/Drum 25kg/Drum

Price valid (until):

2025-02-03

Contact Supplier

 Chat Now

Hangzhou Hyper Chemicals Limited

Company Type:

Trader

Location:

China

Qualification:

Main Products:

Pharmaceuticals,Peptide,Cosmetics,Nutritional Supplements

 Visit Store

Product Description
Seller Information
Inquiry History

Description

Name	Oseltamivir phosphate
CAS number	204255-11-8
Related CAS	204255-11-8 (phosphate) 196618-13-0 (free base) 204255-09-4 (HCl)
Synonym	Oseltamivir, GS-4071, GS-4104, Tamiflu
Description	Oseltamivir is an antiviral medication used to treat influenza A and influenza B (flu), and to prevent flu after exposure. The medication is taken orally. The Infectious Disease Society of America, the United States' Centers for Disease Control and Prevention (CDC), and the United Kingdom's National Institute for Health and Care Excellence recommend the use of oseltamavir for people who have complications or are at high risk for complications who present within 48 hours of first symptoms of infection. They recommend its use to prevent infection in at-risk people but not the general population. The CDC recommends that clinicians use their discretion to treat those at lower risk who present within 48 hours of first symptoms of infection.
Structure
Molecular Formula	C₁₆H₃₁N₂O₈P
Molecular Weight	410.400
Appearance	Solid powder
Quality Standard	USP, EP, BP, CP
Shipping Condition	Shipped under ambient temperature as non-hazardous chemical. This product is stable enough for a few weeks during ordinary shipping and time spent in Customs.
Storage Condition	Dry, dark and at 0 – 4 ℃ for short term (days to weeks) or -20 ℃ for long term (months to years).
Shelf Life	>2 years if stored properly
Sample package	Aluminium foil bag
Commercial package	Aluminium Tin, Fiber drum
Origin	China

Oseltamivir phosphate More Info

1. General Information

Oseltamivir phosphate is a well - known antiviral drug. Chemically, it is an ethyl ester prodrug of oseltamivir carboxylate. The molecular formula of oseltamivir phosphate is C₁₆H₂₈N₂O₄·H₃PO₄.

2. Mechanism of Action

It works by inhibiting the neuraminidase enzyme. Neuraminidase is a glycoprotein found on the surface of influenza virus particles. This enzyme is crucial for the release and spread of newly - formed virus particles from infected cells. By inhibiting neuraminidase, oseltamivir phosphate prevents the virus from budding off from the host cell and spreading to other cells in the body. As a result, it can reduce the severity and duration of influenza virus infections.

3. Pharmacokinetics

Absorption: Oseltamivir phosphate is well - absorbed from the gastrointestinal tract after oral administration. The prodrug is rapidly hydrolyzed in the liver and intestine to its active form, oseltamivir carboxylate.

Distribution: It is distributed widely throughout the body, reaching tissues and fluids where the virus may be replicating.

Metabolism: The metabolism mainly occurs in the liver through ester hydrolysis.

Excretion: The drug and its metabolites are mainly excreted through the kidneys.

4. Indications

It is primarily used for the treatment and prophylaxis (prevention) of influenza A and influenza B virus infections. When used for treatment, it is most effective if started within 48 hours after the onset of influenza symptoms. For prophylaxis, it can be given to individuals who have been exposed to the influenza virus to reduce the likelihood of developing the disease.

5. Dosage and Administration

Dosage varies depending on the age and purpose (treatment or prophylaxis). For example, in adults for treatment of influenza, the typical dose is 75 mg twice a day for 5 days. For prophylaxis, the dose may be 75 mg once a day. It is usually administered orally in the form of capsules or oral suspension.

6. Side Effects

Common side effects include nausea, vomiting, headache, and pain. Some patients may also experience diarrhea or bronchitis - like symptoms. In rare cases, more severe side effects such as skin rashes, allergic reactions, and abnormal liver function tests may occur.

7. Precautions and Contraindications

Precautions need to be taken in patients with renal impairment, as the drug's excretion may be affected. It should be used with caution in individuals with a history of allergic reactions to the drug or its components. Contraindications may include known hypersensitivity to oseltamivir phosphate.

Shop API Calcium Silicate-Detailed Image 1

Certificates

Basic Info

Product Name:

Oseltamivir phosphate

Other Name:

1-Cyclohexene-1-carboxylic acid,4-(acetylamino)-5-amino-3-(1-ethylpropoxy)-,ethyl ester,(3R,4R,5S)-,phosphate (1:1);1-Cyclohexene-1-carboxylic acid,4-(acetylamino)-5-amino-3-(1-ethylpropoxy)-,ethyl ester,[3R-(3α,4β,5α)]-,phosphate (1:1);Oseltamivir phosphate;Ro 64-0796/002;Ethyl (3R,4R,5S)-4-N-Acetylamino-5-amino-3-(1-ethylpropoxy)-1-cyclohexene-1-carboxylate phosphate (1:1);Tamiflu;Oseltamir phosphate;(-)-Oseltamivir phosphate;Fluvir;Saiflu;Ethyl (3R,4R,5S)-4-acetamido-5-amino-3-(pentan-3-yloxy)cyclohex-1-ene-1-carboxylate phosphate;Oseltamivir ethyl ester;332047-25-3

CAS No.:

204255-11-8

Molecular Formula:

C16H28N2O4.H3O4P

InChIKeys:

InChIKey=PGZUMBJQJWIWGJ-ONAKXNSWSA-N

Molecular Weight:

410.4

Exact Mass:

410.181793

UNII:

4A3O49NGEZ

DSSTox ID:

DTXSID0044230

NCI Thesaurus Code:

C29305

ATC Code:

J05AH02

HScode:

2924299090

Categories:

Antipyretic Analgesics

Characteristics

PSA:

168

XLogP3:

1.44800

Appearance:

white to beige

Density:

1.08g/cm3

Melting Point:

184-186 °C

Boiling Point:

473.3°C at 760 mmHg

Flash Point:

240ºC

Water Solubility:

H2O: soluble 30mg/mL, clear

Storage Conditions:

-20°C Freezer

Vapor Pressure:

1.3X10-8 mm Hg at 25 deg C (est)

See More Oseltamivir phosphate Properties 

Hazard Identification

Classification of the substance or mixture

Skin sensitization, Category 1

Eye irritation, Category 2

Hazardous to the aquatic environment, long-term (Chronic) - Category Chronic 3

GHS label elements, including precautionary statements

Precautionary statement(s)
Pictogram(s)
Signal word	Warning
Hazard statement(s)	H317 May cause an allergic skin reaction H319 Causes serious eye irritation H412 Harmful to aquatic life with long lasting effects
Prevention	P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P272 Contaminated work clothing should not be allowed out of the workplace. P280 Wear protective gloves/protective clothing/eye protection/face protection/hearing protection/... P264 Wash ... thoroughly after handling. P273 Avoid release to the environment.
Response	P302+P352 IF ON SKIN: Wash with plenty of water/... P333+P317 If skin irritation or rash occurs: Get medical help. P321 Specific treatment (see ... on this label). P362+P364 Take off contaminated clothing and wash it before reuse. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
Storage	none
Disposal	P501 Dispose of contents/container to an appropriate treatment and disposal facility in accordance with applicable laws and regulations, and product characteristics at time of disposal.

Other hazards which do not result in classification

no data available

Handling and Storage

Precautions for safe handling

Handling in a well ventilated place. Wear suitable protective clothing. Avoid contact with skin and eyes. Avoid formation of dust and aerosols. Use non-sparking tools. Prevent fire caused by electrostatic discharge steam.

Conditions for safe storage, including any incompatibilities

Store the container tightly closed in a dry, cool and well-ventilated place. Store apart from foodstuff containers or incompatible materials.

See More Oseltamivir phosphate Safety Data Sheet 

Seller Information

Business Type:
Trader

Main Products:
Pharmaceuticals,Peptide,Cosmetics,Nutritional Supplements

Location:
Rm. 803, Tower 4, LOFT49 Creative City Pioneer Zone, No.88 Jiru Rd. Gongshu Dist., Hangzhou, 310015 ZJ, China

Payment Terms:
TT against copy of documents,D/P,L/C,D/A,O/A,TT against B/L draft before shipment,100% TT in advance

Average lead Time:
10

Total Annual Revenue:
$5 million-$10 million

Total Employees:
11-50

Year of Establishment:
2013

Certifications:
Certification Report by Bureau Veritas

About HyperChem

Established in 2013, Hyper Chem has exclusive tie-ups with leading manufacturers, supplying raw materials produced in GMP and ISO 9002 certified facilities, and provides high-quality ingredients and raw materials to meet the needs of a diverse range of pharmaceutical cosmetics ingredients and nootropic supplements companies worldwide.

Our Competitiveness

One-stop supply

Wide Range Of products including pharmaceutical, Cosmetic Ingredients and nootropic supplements

Among all the pharmaceuticals,

90% of them with GMP certificates,

85% of them with DMF files and

50% of them passed FDA approval,

30% get CEP certificate

20% are new R&D products.

Custom Repackaging Service

We can efficiently repackage your material into sample sizes, custom batch-specific sizes, or semi-bulk package sizes according to your specifications. And ensures the product is packaged in a quality-controlled environment and will maintain its integrity throughout every stage of the process.

Quality Control/Quality Assurance

HyperChem is committed to delivering on its promises of top-quality products with verified quality data.

All materials are vigorously inspected by the factory and/or outsourced analytical laboratories to ensure each and every lot meets or exceeds our reference standards.

Trade assurance service with 100% payment protection, It is best achieved by delivering products and services 100% right the first time, on time, every time.

Professional

Transparent Communication

Fast Reaction,

Professional Suggestion

Beyond Expectation.

We have exclusive partnerships with research and production facilities across the country and we offer varied pharmaceutical services in the most cost-efficient way. The production facilities are GMP, WHO-GMP, EU GMP and US FDA approved and are backed by strong regulatory support such as Dossier, DMF, Tech Pack and relevant Stability studies for regulatory filings.

Inquiry History

5 Inquiries

Country	Product	Purchase Quantity	Date Posted
India	Oseltamivir Granule USP	50 KG	Nov 14, 2025
India	Oseltamivir phosphate	250 MG	Aug 7, 2025
India	Oseltamivir Phosphate	100 KG	Dec 8, 2025
Bangladesh	Oseltamivir Phosphate	1 MT	Sep 5, 2024
India	Osaltamavie pospate	30.00 KG	Apr 7, 2024

Post an enquiry for this product

More Choices Find All Products for Sale 

Product Name	Grade / Content	Supplier Name	Details
Oseltamivir phosphate	Pharmaceutical Grade/99	Echemi Pharmaceutical	Inquiry
Oseltamivir phosphate 99.5% white or off-white crystalline powder	/99.5	JOXBIO	Inquiry
Oseltamivir phosphate 99% white power 204255-11-8 HRD	Pharmaceutical Grade/99	Zhuhai Hairuide Bioscience and Technology Co., Ltd	Inquiry
Factory Price Oseltamivir Phosphate Research Chemical CAS 204255-11-8 99% Crystal chaolai	Chemical Grade/99	Handan Chaolai Import and Export Co., Ltd	Inquiry
Api Oseltamivir Phosphate 98% GS 4104 POWDER GS-4104 gs-4104	Top Product/98	Dingwang Technology (Wuhan) Co., Ltd.	Inquiry