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Uses Mechanisms of Action Drug Interactions Adverse reactions Preparation
Omeprazole structure
Chemical Name:
Molecular Formula:
Formula Weight:
MOL File:

Omeprazole Properties

Melting point:
Flash point:
storage temp. 
H2O: 0.5 mg/mL
pKa 4.14/8.9(H2O,t =25,I=0.025) (Uncertain)
Water Solubility 
Soluble in water (0.5 mg/ml), DMSO (25 mg/ml), and ethanol (4.5 mg/ml).
Stable, but hygroscopic and photosensitive. Incompatible with strong oxidizing agents. Store in the dark.
CAS DataBase Reference
73590-58-6(CAS DataBase Reference)
  • Risk and Safety Statements
  • Hazard and Precautionary Statements (GHS)
Hazard Codes  Xi,T,F
Risk Statements  36/37/38-39/23/24/25-23/24/25-11
Safety Statements  26-36-37/39-45-36/37-16-7
RIDADR  UN1230 - class 3 - PG 2 - Methanol, solution
WGK Germany  2
RTECS  DD9087000
HS Code  29333990
Hazardous Substances Data 73590-58-6(Hazardous Substances Data)
Toxicity LD50 in mice, rats (g/kg): 0.08, >0.05 i.v.; >4, >4 orally (Ekman)
Signal word: Danger
Hazard statements:
Code Hazard statements Hazard class Category Signal word Pictogram P-Codes
H225 Highly Flammable liquid and vapour Flammable liquids Category 2 Danger P210,P233, P240, P241, P242, P243,P280, P303+ P361+P353, P370+P378,P403+P235, P501
H303 May be harmfulif swallowed Acute toxicity,oral Category 5 P312
H315 Causes skin irritation Skin corrosion/irritation Category 2 Warning P264, P280, P302+P352, P321,P332+P313, P362
H319 Causes serious eye irritation Serious eye damage/eye irritation Category 2A Warning P264, P280, P305+P351+P338,P337+P313P
H335 May cause respiratory irritation Specific target organ toxicity, single exposure;Respiratory tract irritation Category 3 Warning
H370 Causes damage to organs Specific target organ toxicity, single exposure Category 1 Danger P260, P264, P270, P307+P311, P321,P405, P501
Precautionary statements:
P210 Keep away from heat/sparks/open flames/hot surfaces. — No smoking.
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P264 Wash hands thoroughly after handling.
P264 Wash skin thouroughly after handling.
P280 Wear protective gloves/protective clothing/eye protection/face protection.
P311 Call a POISON CENTER or doctor/physician.
P301+P310 IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician.
P304+P340 IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing.
P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.
P405 Store locked up.

Omeprazole price More Price(16)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 19329 Omeprazole analytical standard 73590-58-6 50mg $61.3 2018-11-13 Buy
Sigma-Aldrich 1478505 Omeprazole United States Pharmacopeia (USP) Reference Standard 73590-58-6 200mg $348 2018-11-13 Buy
TCI Chemical O0359 Omeprazole >98.0%(HPLC)(T) 73590-58-6 5g $86 2018-11-22 Buy
TCI Chemical O0359 Omeprazole >98.0%(HPLC)(T) 73590-58-6 25g $306 2018-11-22 Buy
Alfa Aesar J62860 Omeprazole, 98% 73590-58-6 5g $190 2018-11-13 Buy

Omeprazole Chemical Properties,Uses,Production


Omeprazole is a proton pump inhibitor used to treat diseases like gastroesophageal reflux disease (GERD), used for gastric and duodenal ulcers, reflux or erosive esophagitis, and Zollinger-Ellison syndrome. It is also effective for gastric and duodenal ulcers that are ineffective with H2 receptor antagonists. Injections of Omeprazole can also be used for: 1 gastrointestinal bleeding, such as peptic and anastomic ulcer bleeding, and the prevention of severe diseases (such as cerebral hemorrhage, severe trauma, etc.) and gastric surgery caused by upper intestinal bleeding; 2 acute gastric mucosal damage complicated by stress or nonsteroidal anti-inflammatory drugs; 3 general anesthesia, post-surgery, or coma patients, to prevent acid reflux and aspiration pneumonia; 4 Combined with amoxicillin and clarithromycin, or with metronidazole and clarithromycin, it can effectively kill Helicobacter pylori (Hp).

Mechanisms of Action

Omeprazole is a proton pump inhibitor which can specifically act on gastric parietal cell proton pump sites and transform into the active form of sulfonamide, then irreversibly binds to the proton pumps through disulfide bonds, generating a sulfonamide and proton pump compound (H + -K + -ATP), thereby inhibiting the enzymatic activity, preventing the H+ in parietal cells from being transported to the stomach cavity. It has a strong and persistent inhibitory role on gastric acid secretion caused by basal gastric acid and pentapeptide gastric acid secretions, greatly reducing gastric acid within the gastric juice. Rapid, reversible, and no H2 antagonist-induced psychiatric side effects.

Drug Interactions

Adverse reactions

Omeprazole is well tolerated, and most adverse reactions are mild and reversible.



Omeprazole is a potent gastric antisecretory agent with selective inhibitory effect on the H+,K+-ATPase proton pump. It is highly effective in the treatment of duodenal ulcer and Zollinger-Ellison syndrome, and is reportedly superior to ranitidine in the management of reflux esophagitis.

Chemical Properties

White Crystalline Solid


Astra (Sweden)


Binds covalently to proton pump. It inhibits gastric secretion. Used as an anttiulcerative


diuretic, sweetener, diagnostic aid


A selective proton pump and CYP inhibitor


Omeprazole Pellets are used in the treatment of Gastroesophageal reflux disease (GERD): A condition in which backward flow of acid from the stomach causes heartburn and injury of the food pipe (esophagus)


ChEBI: A member of the class of benzimidazoles that is 1H-benzimidazole which is substituted by a [4-methoxy-3,5-dimethylpyridin-2-yl)methyl]sulfinyl group at position 2 and a methoxy group at position 5.

brand name

. Prilosec (AstraZeneca).

World Health Organization (WHO)

Omeprazole was introduced in the 1980s. It belongs to a group of agents that have an inhibitory effect on the secretion of hydrochloric acid in the stomach (gastric acid proton pump inhibitors) and is used in the treatment of upper gastrointestinal tract disorders. The Committee for Proprietary Medicinal Products of the European Commission has concluded that a causal association between the reactions reported in Germany and the use of omeprazole had not been established. Nevertheless oral administration should be preferred. (Reference: (CPMPPO) Pharmacovigilance Opinion, No.16 , , 25 July 1994)

General Description

Omeprazole, 5-methoxy-2-(((4-methoxy-3, 5-dimethyl-2-pyridinyl)methyl) sulfinyl)-1Hbenzimidazole(Losec), is a white to off-white crystallinepowder with very slight solubility in water. Omeprazole isan amphoteric compound (pyridine N, pKa 4.06; benzimidazoleN-H, pKa 0.79), and consistent with the proposedmechanism of action of the substituted benzimidazoles, isacid labile. Hence, the omeprazole product is formulatedas delayed-release capsules containing enteric-coatedgranules.
The absolute bioavailability of orally administeredorneprazole is 30% to 40% related to substantial first-passbiotransformation. The drug has a plasmahalf-life of about 1 hour. Most (77%) of an oral dose ofomeprazole is excreted in the urine as metabolites with insignificantantisecretory activity. The primary metabolitesof omeprazole are 5-hydroxyomeprazole (CYP2C19) andomeprazole sulfone (CYP3A4). The antisecretory actions ofomeprazole persist for 24 to 72 hours, long after the drughas disappeared from plasma, which is consistent with itssuggested mechanism of action involving irreversible inhibitionof the proton pump.
Omeprazole is approved for the treatment of heartburn,GERD, duodenal ulcer, erosive esophagitis, gastric ulcer,and pathological hypersecretory conditions.

Biological Activity

H + ,K + -ATPase inhibitor (IC 50 = 5.8 μ M) that displays antisecretory and antiulcer activity. Inhibits gastric acid secretion (IC 50 = 0.16 μ M for histamine-induced acid formation) and reduces gastric lesion formation induced by a variety of ulcerative stimuli. Antibacteral against Helicobacter pylori in vitro . Also inhibits CYP2C19, CYP2C9 and CYP3A (K i values are 3.1, 40.1 and 84.4 μ M respectively) and blocks swelling-dependent chloride channels (ICIswell).

Metabolic pathway

When male humans are given 14C-omeprazole orally, an average of 79% of the dose is recovered in the urine in 96 h. Omeprazole is completely metabolized and at least six metabolites are identified. Two major metabolites are hydroxyomeprazole and omeprazole acid.

Omeprazole Preparation Products And Raw materials

Raw materials

Preparation Products

Omeprazole Suppliers

Global( 369)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Jiangsu Zhongbang Pharmaceutical Co., Ltd.
025-87151996 CHINA 32 55
Shenzhen Sendi Biotechnology Co.Ltd.
0755-23311925 18102838259
0755-23311925 CHINA 3203 55
Henan DaKen Chemical CO.,LTD.
+86-371-55531817 CHINA 21967 58
Henan Tianfu Chemical Co.,Ltd.
0371-55170693 CHINA 20680 55
Mainchem Co., Ltd.
+86-0592-6210733 CHINA 32457 55
Rixing Chemical CO.,LTD
- CHINA 235 55
020-81716319 CHINA 2543 55
Hubei XinRunde Chemical Co., Ltd.
+8615102730682; +8618874586545
02783214688 CHINA 541 55
Hefei TNJ Chemical Industry Co.,Ltd.
86-0551-65418684 18949823763
86-0551-65418684 China 1730 55
Xiamen AmoyChem Co., Ltd
+86 (0)592-605 1114 CHINA 6374 58

View Lastest Price from Omeprazole manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2019-04-02 Omeprazole Manufacturer; In stock GMP Factory
US $1.00 / KG 1KG High quality manufacturer TOP 3 largest production factory in China Chemwill Asia Co.,Ltd.
2018-08-08 Omeprazole
US $1.00 / KG 1KG 99% 1000kg career henan chemical co
2018-03-28 Omeprazole (CAS :73590-58-6)
US $10.00 / KG 10KG 99% 10MT Hubei XinRunde Chemical Co., Ltd.

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