Iodophors

What are iodophors and what are their advantages

Iodophors are modern antiseptic complexes in which active iodine is chemically bound to high-molecular-weight surfactants. Polyvinyl alcohol or povidone most frequently serve as such carriers (surfactants).

Binding to the macromolecule fundamentally alters the properties of the halogen, giving iodophors a number of advantages over traditional elemental iodine:

• Solubility: the preparations dissolve easily in water.
• Prolonged effect: the active component is released not all at once, but gradually, ensuring prolonged contact with the affected tissues.
• Tissue safety: the complexes lack pronounced irritant action and do not cause chemical burns.
• Aesthetics: the solutions are classified as "mild" antiseptics and do not leave persistent stains on the skin.

Basic monopreparations: Iodinol and Povidone-iodine

Iodinol is an aqueous solution containing 0.1% iodine, 0.3% potassium iodide, and 0.9% polyvinyl alcohol. It is polyvinyl alcohol that slows down the release of the halogen, prolonging the antiseptic effect and reducing irritation. The drug is actively used in ENT practice and dentistry for irrigation, washing, and moistening the mucous membranes of the nasopharynx and oral cavity. In surgery and traumatology, it is used in the form of compresses to treat infected wounds and burns.

Povidone-iodine (also known by the synonyms Iodividon and Betadine) is a 10% solution of an iodine complex with polyvinylpyrrolidone. Upon contact with the skin or mucous membranes, active substance is gradually released, which produces a powerful bactericidal effect. The spectrum of action of the drug is extremely wide: it destroys gram-positive and gram-negative bacteria (including E. coli and S. aureus), as well as fungi, viruses, and protozoa.

Povidone-iodine dosage forms are diverse:

1. Solutions (0.5–10%): used for surgical hand disinfection, preparation of the surgical field, treatment of abrasions, cut wounds, trophic ulcers of the lower leg, bedsores, nasopharyngeal infections, and superficially infected dermatoses.
2. Vaginal suppositories: prescribed for trichomoniasis, bacterial vaginosis, and fungal infections of the genital organs.
3. Ointments: used for the treatment of infectious dermatitides, burns, abrasions, and ulcers.

Combined iodine preparations

To enhance the therapeutic effect or improve pharmacokinetic properties, iodine is frequently combined with other active components.

• Yoks (Yoks): available as a spray and contains povidone-iodine combined with allantoin. This is a popular remedy in ENT practice. It is prescribed for tonsillitis, glossitis (inflammation of the tongue), laryngitis, as well as for early symptoms of influenza and as an adjunct to antibiotic therapy in streptococcal tonsillitis. Adverse effects may include allergic reactions and a rare, short-lived burning sensation upon application.
• Iodonat (Iodonat): a complex preparation containing iodine, potassium iodide, alkyl sulfonate, and phosphoric acid. Its key feature is the necessity of strict dilution before use. The stock solution is diluted 4.5 times with boiled or sterile water. It is applied topically for surgical hand preparation, disinfection of the surgical field, and re-treatment of wound edges before suturing.
• Iodopiron (Iodopiron): a combination of povidone-iodine and potassium iodide. It has a pronounced anti-inflammatory, fungicidal, and bactericidal effect. It is effective against antibiotic-resistant strains of microorganisms (including Proteus, E. coli, S. aureus). It is available as an ointment, aerosol, and solution. The solution is actively used for disinfecting gloves and the elbow folds of donors, while topical forms are used to treat bedsores, dermatitis, burns, and infected wounds.

Side Effects and Precautions

Despite their status as "mild" antiseptics, iodophors require caution. The primary danger of their use is the development of iodism. This is a specific non-infectious inflammation of the mucous membranes that occurs at the sites of iodine excretion from the body. Most frequently, iodism manifests when recommended dosages are exceeded (overdose) or if the patient has individual intolerance to the drug components.

Class and exam questions

What else to study on this topic

• Pharmacodynamics of the gradual release of elemental iodine
• Spectrum of antimicrobial activity of povidone-iodine (bacteria, fungi, viruses, protozoa)
• Features of using iodophors in gynecology (vaginal suppositories)
• Comparative characteristics of combined preparations (Yoks, Iodonat, Iodopiron)
• Prevention and treatment of iodism

Other topics in the section «Antiseptics and Disinfectants»

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