Cephalexin: What It Is, How to Use It, and What to Watch For

Cephalexin is a common antibiotic that doctors prescribe for many bacterial infections. It belongs to the cephalosporin family, which works by stopping bacteria from building their walls. If you’ve been told to take cephalexin, you’re probably dealing with a skin infection, a sore throat, a urinary tract infection, or an ear infection. Below we break down the basics so you know exactly how to use it and what to expect.

When Do Doctors Choose Cephalexin?

Doctors pick cephalexin because it’s effective against a wide range of gram‑positive bacteria and some gram‑negative ones. It’s often a first‑line treatment for:

• Strep throat
• Skin infections like cellulitis or impetigo
• Urinary tract infections
• Ear infections (otitis media)
• Bone infections (osteomyelitis) in certain cases

If your infection is caused by a bug that’s resistant to other antibiotics, your doctor may still try cephalexin before moving to stronger drugs.

How to Take Cephalexin Safely

Most patients take cephalexin tablets or liquid twice a day. The exact dose depends on the infection, your age, and kidney function. Typical adult dosages range from 250 mg to 1 g every 6 to 12 hours. Kids get a dose based on weight, usually measured in mg per kilogram.

Here are a few practical tips:

• Take the pill with a full glass of water.
• If you have stomach upset, you can take it with food, but don’t skip meals just because you’re on the drug.
• Finish the whole prescription, even if you feel better after a few days. Stopping early can let bacteria survive and become resistant.
• Set a reminder on your phone or use a pill organizer to keep the schedule steady.

For the liquid form, use the measuring device that comes with the bottle. A kitchen spoon isn’t accurate enough and can lead to an under‑dose.

Common Side Effects and When to Call the Doctor

Most people tolerate cephalexin well. The most common side effects are mild and include:

• Upset stomach or diarrhea
• Nausea
• Headache
• Rash

If any of these symptoms get worse, or if you develop a fever, severe diarrhea, or a new rash that looks blistered, call your doctor right away. These could be signs of an allergic reaction or a more serious problem like Clostridioides difficile infection.

Drug Interactions to Keep in Mind

Cephalexin can interact with a few other medicines. For example, it may reduce the effectiveness of oral contraceptives, so use a backup method while you’re on the antibiotic. Antacids containing aluminum or magnesium can also lower how much cephalexin your body absorbs. Take antacids at least two hours before or after the antibiotic to avoid this.

Always tell your pharmacist or doctor about any other prescriptions, over‑the‑counter drugs, or supplements you’re taking. That way they can spot potential issues before they become a problem.

Buying Cephalexin Online – What to Look For

Many people search for cheaper ways to get cephalexin. If you decide to shop online, follow these safety steps:

• Choose a pharmacy that requires a valid prescription. A legit site will never sell prescription meds without it.
• Check that the website uses secure https connections and displays clear contact information.
• Read reviews from other customers, but watch out for overly generic praise.
• Compare prices, but remember that a deal that looks too good to be true often is.

In South Africa and many other countries, you can also use local online pharmacies that partner with licensed doctors for e‑prescriptions. These services usually include a verification step, making the process safer.

When your package arrives, inspect the labeling. The medication should match the name, strength, and quantity on your prescription. If anything looks off, contact the pharmacy immediately.

Cephalexin is a reliable antibiotic when used correctly. Knowing the right dose, watching for side effects, and buying from reputable sources can help you get the best results without hassle. If you ever feel unsure, a quick call to your healthcare provider can clear things up.