What You Need to Know About Antibiotics 💊

Antibiotics are medications that fight bacterial infections. If you're taking them—or considering whether you should—it helps to understand how they work, when they're appropriate, and what to expect. This is especially important for older adults, who may be more sensitive to side effects or interactions with other medications.

How Antibiotics Work

Antibiotics kill bacteria or stop them from multiplying. Different antibiotics target bacteria in different ways: some damage the bacterial cell wall, others interfere with how bacteria reproduce, and still others disrupt essential functions inside bacterial cells.

The key point: antibiotics only work against bacterial infections. They don't work on viruses (like colds, flu, or COVID-19), fungi, or other types of infections. Taking an antibiotic for a viral infection won't help you recover faster and can contribute to a serious public health problem called antibiotic resistance—when bacteria evolve to survive antibiotics that once killed them.

Common Types of Antibiotics

Healthcare providers prescribe from several broad families, each suited to different types of bacteria:

Your doctor chooses based on the type of bacteria suspected, your age, kidney or liver function, allergies, and other medications you take.

When Antibiotics Are Appropriate

Your healthcare provider should prescribe antibiotics only when a bacterial infection is confirmed or strongly suspected. Common reasons include:

• Urinary tract infections
• Bacterial pneumonia
• Strep throat
• Skin or wound infections
• Some ear infections
• Certain sexually transmitted infections

The decision depends on your individual situation: the type of infection, its severity, your age, your medical history, and your current medications. This is why it's essential to discuss symptoms and concerns directly with your doctor rather than self-treating or using leftover antibiotics from a previous prescription.

What to Expect and How to Use Them Safely

Once prescribed, take antibiotics exactly as directed—usually for the full course, even if you feel better after a few days. Stopping early increases the risk that infection will return and contributes to resistance.

Common side effects vary by antibiotic but may include nausea, diarrhea, rash, or sensitivity to sunlight. Some people have allergies, ranging from mild rash to severe reactions. Tell your doctor about any previous antibiotic reactions.

Seniors should be aware of special considerations:

• Some antibiotics (particularly fluoroquinolones) may increase fall risk or cause tendon problems in older adults
• Kidney or liver function changes with age, which affects how medications are processed
• Drug interactions are more common when taking multiple medications

Antibiotic Resistance: Why It Matters

When antibiotics are overused or used incorrectly, bacteria adapt and survive treatment. This makes infections harder—sometimes impossible—to treat. It's a major public health concern. You help prevent resistance by:

• Using antibiotics only when prescribed for a confirmed bacterial infection
• Completing the full course as directed
• Never sharing antibiotics with others
• Not requesting antibiotics for colds, coughs, or viral illnesses

Questions to Ask Your Doctor

Before starting an antibiotic, clarify:

• What infection are you treating, and how was it confirmed?
• How long should I take this medication?
• What side effects should I watch for?
• Are there interactions with my other medications?
• What should I do if I develop a rash, severe diarrhea, or other concerning symptoms?

Your healthcare provider knows your complete medical picture and can weigh the benefits and risks for your specific situation in ways a general resource cannot. That conversation is where the right decision gets made. 🩺