Antimicrobial Agent

Antimicrobial agent; In medicine, antibiotics and antiseptics are important in protecting from harmful microbes. Antibiotics help with treating inner body infections, while antiseptics protect from outer body threats through the prevention of infections, whether it be on a wound or during surgery. 

This article helps to deconstruct the two most important features of antimicrobial agents, antibiotics and antiseptics, what they are, how they work, and where they are used.

Table of Contents

• What are Antimicrobial Agents?
• How Do Antibiotics Help Us Fight Infections?
• What are Antiseptics?
• Antiseptics and Disinfectants: What’s the Difference?
• Everyday Uses of Antimicrobial Agents Around Us

What are Antimicrobial Agents?

Antimicrobial agents refer to chemicals which kill or inhibit the growth of harmful microorganisms like bacteria, fungi (yeasts and moulds), viruses, and protozoa. Antimicrobial agents are used to control infections and prevent the spread of disease in both clinical and non-clinical environments.

 

Antimicrobial agents can be divided into three categories: antibiotics, antiseptics, and disinfectants; each category works differently, but they all serve the same function - protect our health from invasive, undesired microbes.

How Do Antibiotics Help Us Fight Infections?

Antibiotics are powerful medicinal agents designed to fight bacterial infections inside the body. They work by either stopping bacteria from multiplying or by killing them outright.

Antibiotics are specific to bacteria and don’t work against viruses, which is why they aren’t used for illnesses like the common cold or flu. Overusing or misusing antibiotics can lead to antibiotic resistance, a serious global health concern.

Therefore, antibiotics must only be taken under a doctor’s supervision and for the prescribed duration!

➔ Classifications of Antibiotics

1. A broad-spectrum antibiotic:

It is an antibiotic type that can work for many different types of bacteria, both gram-negative and gram-positive.
Example: Tetracycline, Chloramphenicol.

2. Narrow-spectrum antibiotics:

These target specific types of bacteria.
Example: Penicillin G is effective mainly against gram-positive bacteria.

➔ Examples of Common Antibiotics

Antibiotic	Action	Target
Penicillin	Inhibits bacterial cell wall synthesis	Gram-positive bacteria
Tetracycline	Inhibits protein synthesis	Broad-spectrum
Streptomycin	Affects bacterial ribosomes	Tuberculosis bacterium

 

➔ Antibiotic Applications

• Antibiotics can treat bacterial infections, including pneumonia, urinary tract infections, and strep throat.

• They can be used to prevent infections during surgery.

• They can be used to manage chronic bacterial infections such as tuberculosis.

Note: 

➔ Antibiotics are not effective against viruses (e.g., flu, cold, COVID-19).

➔ Misuse or overuse of antibiotics can lead to antibiotic resistance, as bacteria adapt and become resistant to existing medications, making it harder to treat infections.

What are Antiseptics?

Antiseptics are chemical agents that are applied to living tissue (skin, wounds, mucous membranes, etc.) to destroy or inhibit the growth of microorganisms. Antiseptics are used to prevent infection, especially in the case of medical procedures, surgeries, and first aid treatment.

 

➔ How Antiseptics Work:

Antiseptics destroy microbes or inhibit their growth by disrupting their metabolism or damaging their cell membranes.

➔ Examples of Common Antiseptics

 

➔ Uses of Antiseptics

• Disinfecting wounds and cuts.

• Pre-surgical skin preparation.

• Cleaning hands and medical tools.

• Treating fungal infections like athlete’s foot.

Antiseptics and Disinfectants: What’s the Difference?