Halogens and Halogen-Containing Compounds

Frequently asked questions

Which specific drugs belong to chlorine-containing antiseptics?

Chlorine-containing antiseptics and disinfectants include the following specific agents:

• Chloramine B — used for disinfecting premises, patient care items, and interiors; chlorine-containing preparations, including chloramine B, are listed among chemical disinfectants.
• Chloramine — a 1–2% solution is used for root canal treatment.
• Chlorhexidine (chlorhexidine bigluconate) — a dichlorinated biguanide derivative; used for surgical field and surgeon's hand antisepsis, as well as in endodontics as a 0.2% solution.
• Sodium hypochlorite — a 3–5% solution is used in endodontics; it dissolves necrotic tissue and exerts a bactericidal effect on Gram-positive and Gram-negative bacteria, fungi, and viruses.
• Bleaching powder (chloride of lime) — a 0.5% solution is used for processing bedpans or chamber pots.
• Diocid — used for surgeon's hand and surgical field antisepsis, irrigation of purulent wounds, and sterilization of rubber, plastic, and medical instruments.
• Dinatrium monalazone (Galazone, Pantocid) — used for water disinfection, medical staff hand antisepsis, wound management, and douches.

Which iodine preparations are used in medical practice as antiseptics?

The following iodine preparations are used as antiseptics in medical practice:

• 5% Alcoholic iodine solution — used for treating skin and wound edges.
• Lugol's solution — intended for mucous membrane treatment.
• Iodophors (complex compounds of iodine with surfactants):
• Iodinol — for oral mucosa treatment and infected wound management.
• Povidone-iodine (Iodovidon, Betadine) — for surgeon's hand antisepsis, surgical fields, and burns.
• Iodonat (Iodonat) — for surgeon's hand and surgical field antisepsis.
• Iodopiron (Iodopiron) — for wound treatment and disinfection.
• Yoks — used in ENT practice.

How does the mechanism of antimicrobial action of iodine preparations differ from chlorine?

The mechanisms of antimicrobial action of iodine preparations and inorganic chlorine compounds differ significantly.

Feature	Chlorine Preparations	Iodine Preparations
Active Agent	Hypochlorous acid, atomic chlorine, hypochlorite ion, oxygen	Active (elemental) iodine
Effect on Proteins	Atomic chlorine attacks amino groups, blocking polypeptide chain formation. Oxygen and hypochlorite ion cause coagulation	Cause denaturation (precipitation and coagulation) of tissue proteins with the formation of iodamines
Oxidative Action	Strong oxidation due to oxygen and the hypochlorite ion	Oxidative properties are less pronounced; iodine is weaker than chlorine as an oxidant

What adverse effects are typical for halogen-containing antiseptics with topical application?

Topical application of halogen-containing antiseptics may cause the following adverse effects:

• Irritant and caustic action: typical for alcoholic iodine solution, which in high concentrations can cause tissue burns.
• Iodism: non-infectious inflammation of mucous membranes at sites of iodine excretion, occurring due to overdose or individual hypersensitivity (e.g., with Iodinol).
• Allergic reactions: possible with combined iodine preparations (Yoks) and chlorine-containing agents (dinatrium monalazone).
• Burning sensation: a transient burning sensation at the application site of Yoks spray is occasionally reported.

At the same time, complex iodine preparations (iodophors) are distinguished by a lack of irritant tissue effects.

Which chlorine-containing preparations are used for individual disinfection of drinking water?

The chlorine-containing preparation dinatrium monalazone (Galazone, Pantocid) is used for water disinfection. Its main purpose is water purification; it is noted that it practically does not alter the taste of water. Additionally, it can be used for medical personnel hand antisepsis, wound treatment, and douches. A potential adverse effect is the risk of allergic reactions.

Which compounds are the primary focus of pharmacology in this section?

The main focus of the topic is specifically on chlorine-containing substances.

How does environmental acidity affect the breakdown of hypochlorous acid?

In acidic and neutral environments, atomic chlorine and oxygen are released, whereas in an alkaline environment, the hypochlorite ion is formed.

How does atomic chlorine disrupt synthesis in the microbial cell?

It targets protein amino groups, effectively blocking the formation of polypeptide chains.