Chemical formula and structure of losartan

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Losartan is a widely-used medication for the treatment of high blood pressure. Its chemical formula is C22H23ClN6O, and its molecular structure consists of a central carbon ring with multiple functional groups attached. This unique composition allows Losartan to effectively target angiotensin receptors in the body, helping to lower blood pressure and improve cardiovascular health.

Overview of Losartan

Losartan is a medication used to treat high blood pressure (hypertension) and to help protect the kidneys from damage due to diabetes. It belongs to a class of drugs known as angiotensin receptor blockers (ARBs), which work by blocking the action of a hormone called angiotensin II that causes blood vessels to constrict. By blocking the effects of angiotensin II, losartan helps relax blood vessels, lowering blood pressure and improving blood flow.

Losartan was first developed by Merck & Co. Inc. and received approval for medical use in 1995. It is available in both brand-name and generic forms and is typically taken orally in the form of tablets.

Brand name Cozaar
Class Angiotensin receptor blocker (ARB)
Medical uses High blood pressure, diabetic kidney disease
Administration Oral tablets

History and Development

Losartan was first developed by Merck & Co. in the late 1980s as a potential treatment for hypertension and other cardiovascular conditions. The development of losartan was a result of extensive research into the renin-angiotensin system and its role in regulating blood pressure.

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In 1995, losartan received approval from the U.S. Food and Drug Administration (FDA) for the treatment of hypertension. Since then, it has become one of the most widely prescribed medications for high blood pressure and has also been approved for use in various other conditions, such as diabetic nephropathy and heart failure.

The development of losartan represented a significant advancement in the treatment of hypertension and provided patients with an effective and well-tolerated option for managing their blood pressure.

Chemical Properties of Losartan

Losartan is a white to off-white crystalline powder with a molecular formula of C22H23ClN6O. It is practically insoluble in water and freely soluble in methanol and ethanol.



Losartan is highly lipophilic and has a log P of about 2.7. This means that it is more soluble in lipids (fats) than in water. This property influences its absorption and distribution in the body.


Losartan is stable under normal conditions of use and storage. It should be protected from light and stored in a tightly closed container at room temperature.

Chemical Properties of Losartan

Losartan, with the chemical formula C22H23ClN6O, is an angiotensin II receptor antagonist used to treat high blood pressure and heart failure. It works by blocking the action of angiotensin II, a hormone that causes blood vessels to constrict.


Property Value
Molecular Weight 422.917 g/mol
Appearance White to off-white crystalline powder
Solubility Soluble in water and methanol
Melting Point 183-184°C

Losartan’s chemical structure includes a tetrazole ring that is essential for its pharmacological activity. It is usually administered orally in the form of tablets.

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Chemical Formula

Losartan, also known by its chemical name 2-butyl-4-chloro-1-{(2′-[1H-tetrazol-5-yl][1,1′-biphenyl]-4-yl)methyl}-1H-imidazole-5-methanol, has a chemical formula of C22H23ClN6O. The molecular structure of losartan consists of a tetrazole ring, imidazole ring, biphenyl ring, and a chlorine atom attached to a butyl group. This specific chemical composition gives losartan its pharmacological properties as an angiotensin II receptor antagonist, commonly used for the treatment of hypertension and heart failure.

Atomic Structure

Atomic Structure

Losartan has a complex atomic structure that plays a crucial role in its pharmacological activity. The molecule consists of carbon, hydrogen, nitrogen, and oxygen atoms arranged in a specific pattern. The atomic structure of losartan allows it to interact with the angiotensin II receptor and block its action, resulting in the dilation of blood vessels and lowering of blood pressure.

The key atoms in the atomic structure of losartan are tightly bound together, forming a stable molecule that can effectively target the angiotensin II receptor. The arrangement of atoms in losartan is essential for its biological activity and ensures its efficacy as an antihypertensive medication.