Mechanism of Action and Pharmacological Effects
The pharmacological action of demulcents is based on their unique physicochemical property: the ability to form viscous colloidal solutions when mixed with water. Upon reaching the tissue surface—particularly in areas of inflammation or open ulcerative defects—these substances distribute in a thin layer and create a durable colloidal film.
The main function of this film is the mechanical protection of sensitive nerve endings. By isolating receptors from contact with chemical and mechanical irritants, these agents naturally block the transmission of pain impulses. Thus, two key therapeutic effects are achieved:
- Local anti-inflammatory action (by preventing additional trauma to the damaged area).
- Analgesic action (due to the shielding of nerve endings).
Clinical Application in Gastroenterology
Due to their ability to create a reliable barrier, demulcents are widely used for the mechanical protection of mucosal membranes, predominantly within the gastrointestinal tract (GIT).
Main indications include the treatment of inflammatory and destructive processes in the digestive tract:
- Acute and chronic gastritis.
- Peptic ulcer disease of the stomach.
- Peptic ulcer disease of the duodenum.
- Intestinal inflammation (enterocolitis).
An important aspect of their use is protecting the mucosa from other medicinal substances. If a patient needs to take a medication that has a pronounced irritating effect on the gastric mucosa, demulcents (such as starch or flaxseed mucilage) are prescribed in combination—either immediately before taking the aggressive drug or simultaneously with it.
Role in Clinical Toxicology
Demulcents perform a crucial detoxification function in the treatment of acute poisonings. Within the lumen of the gastrointestinal tract, they are capable of physically coating toxic substances.
This process leads to two significant outcomes:
- Significant slowing of toxin absorption into the systemic circulation.
- Acceleration of the elimination of poisons from the body via natural pathways.
This group is of particular importance in poisonings involving heavy metal salts, as well as caustic acids and alkalis. In cases of chemical mucosal burns (from swallowing acids or alkalis), therapy is prolonged. To ensure complete protection of damaged tissues and their subsequent regeneration, demulcents are prescribed for a continuous course lasting two to three weeks.