Origin and Mechanism of Action
Chemically, menthol (also known as racementhol) is a terpene alcohol. The primary natural source of this substance is peppermint essential oil, from which it is extracted for further pharmacological use.
The key feature of the compound's specific action lies in its ability to selectively stimulate cold receptors. Upon contact with mucous membranes or the skin, the patient experiences distinct subjective sensations: an initial feeling of marked cold, which is naturally followed after some time by a mild local anesthesia (pain relief).
Clinical Application in Cardiology
One of the most important aspects of the drug's use in medicine is related to its reflex effect on the cardiovascular system.
The mechanism is implemented as follows:
- The drug enters the patient's oral cavity.
- Local stimulation of cold receptors in the mucous membrane occurs.
- In response to this stimulation, a reflex dilation of spastic coronary vessels occurs, helping to improve myocardial blood supply.
In cardiological practice, this effect is achieved through the use of Validol. By composition, it is a 25% solution of menthol dissolved in the menthyl ester of isovaleric acid.
Pulmonary Application and Topical Use
In addition to cardiology, the agent has found wide application in other fields of medicine due to its irritant and anesthetic properties:
- In Pulmonology: The substance is actively used in the treatment of various inflammatory diseases of the upper respiratory tract. Dosage forms such as drops and inhalation solutions are used to deliver the active substance to the site of inflammation.
- Topical Use: The agent acts as an effective counter-irritant. In this capacity, it is a mandatory component of a number of well-known combination topical preparations. Such preparations include, in particular, Menovazin, Boromenthol, and Efcamon ointments and solutions.
Briefly: answers to topical questions
What is the molecular mechanism of the local anesthetic action of menthol?
The mechanism of menthol's local anesthetic action is associated with the selective stimulation of cold receptors. When applied to mucous membranes or the skin, this specific action causes a subjective sensation of cold, which is then replaced by mild local anesthesia. This reflex type of action is also used to achieve other pharmacological effects. For example, stimulation of cold receptors in the oral mucosa in the sublingual region leads to reflex dilation of spastic coronary vessels via the central nervous system.
In which specific nosologies in pulmonology is the use of menthol indicated?
In pulmonology, the use of menthol is indicated for inflammatory diseases of the upper respiratory tract and respiratory infections. The drug is prescribed in the following cases:
- Inflammatory diseases of the upper respiratory tract — used topically in the form of drops and inhalations.
- Influenza — used as part of symptomatic therapy to treat cough (in inhalations) and eliminate throat tickling (in the form of special lozenges).
To remember the concentration in Validol, imagine a quarter of a circle (25%) with ice (cold receptors) on the heart (coronary vessels).
Class and exam questions
What is the origin of menthol?
It is a terpene alcohol, which is the main component of peppermint essential oil.
Which receptors are stimulated by the drug?
It has specificity of action and selectively stimulates exclusively cold receptors.
How does Validol dilate heart vessels?
Stimulation of cold receptors in the oral cavity causes reflex dilation of spastic coronary vessels.
Which topical remedies contain menthol?
As a counter-irritant, it is part of combination preparations such as Menovazin, Boromenthol, and Efcamon.
What else to study on this topic
- Chemical structure of terpene alcohols
- Physiology and topography of cold receptors
- Mechanism of reflex coronary vasodilation
- Pharmacodynamics of menthyl isovalerate
- Mechanism of action of counter-irritants in local therapy
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