Cephalexin Medications

Cephalexin Info

What Is Cephalexin?

Cephalexin belongs to a group of antibiotics called cephalosporins. It works by stopping bacteria from building the walls they need to survive. Because of this action, cephalexin is used to treat a range of common infections. In Hong Kong you’ll find the ingredient in medicines such as Keflex, Keftab, and the generic product simply called Cephalexin.

Medicines That Contain Cephalexin

Several products on the Hong Kong market contain cephalexin as the active component:

• Keflex - available as tablets, capsules, and an oral suspension for children.
• Keftab - offered in tablet form and a liquid preparation.
• Cephalexin (generic) - sold as tablets, capsules, chewable tablets, and a paediatric suspension.

These medicines come in different strengths, typically ranging from 250 mg to 500 mg per tablet or capsule, and the liquid forms are measured in milligrams per millilitre. All are prescription-only products, regulated by the Hong Kong Department of Health.

What Does Cephalexin Treat?

Cephalexin is prescribed for several kinds of bacterial infections, including:

• Skin infections - such as cellulitis, impetigo, and infected wounds.
• Respiratory tract infections - like sore throat caused by strep, bronchitis, and certain types of pneumonia.
• Ear infections - particularly acute otitis media.
• Urinary tract infections - when caused by susceptible bacteria.
• Bone infections - such as osteomyelitis, often in combination with other antibiotics.

The medicine targets bacteria that are known to be sensitive to cephalosporins, helping the body clear the infection more quickly.

How Cephalexin Works

Cephalexin interferes with the construction of the bacterial cell wall. Without a sturdy wall, bacteria cannot maintain their shape and burst open, which stops the infection from spreading. Because this process begins soon after the medication is absorbed, many people notice improvement in symptoms within a few days, although the full course should be completed as directed.

Safety Information

Common Side Effects

Most people tolerate cephalexin well. Mild and temporary reactions that may occur include:

• Upset stomach, nausea, or mild diarrhoea.
• Skin rash or itching.
• Slight headache.

These effects usually resolve on their own and do not require medical attention unless they persist.

Serious Reactions

Although rare, some reactions need immediate medical care:

• Difficulty breathing, swelling of the face or throat, or a fast heartbeat - possible signs of a severe allergic reaction.
• Severe diarrhoea that may be watery or bloody, which could indicate a serious intestinal condition.
• Unusual bruising or bleeding.

If any of these occur, seek emergency assistance promptly.

Who Should Be Cautious

People with a known allergy to cephalosporins or penicillins should avoid cephalexin. Pregnant or breastfeeding individuals, as well as those with kidney problems, may need special consideration and should rely on the medication’s labeling and professional guidance.

Interaction Awareness

Cephalexin can interact with certain other medicines and substances, such as:

• Other antibiotics that may affect gut bacteria.
• Anticoagulants, which could increase bleeding risk.
• Alcohol, which can worsen stomach upset.

Lifestyle factors like prolonged sun exposure generally do not affect cephalexin, but avoiding alcohol while on the medication may improve comfort.

Important Points to Remember

Store tablets and capsules in a cool, dry place away from direct sunlight. Liquid suspensions should be kept in the refrigerator after reconstitution and shaken well before each use. The typical length of treatment varies from a few days for uncomplicated infections to longer periods for deeper or more serious infections. Always follow the instructions that come with the specific product you are using.

Key Terms

Cephalosporin: A class of antibiotics that fight bacteria by weakening their cell walls.

Cellulitis: A bacterial skin infection that causes redness, swelling, and pain.

Information Disclaimer

This article provides general educational information about cephalexin as an active ingredient found in several medicines. It is intended to help patients understand the ingredient and the conditions it may be used for. It does not replace professional medical advice or the specific instructions that accompany individual products. Medicines containing cephalexin can differ in formulation, strength, and usage directions. Always read the labeling of your particular medication and follow the guidance of your healthcare provider for complete information on proper use, dosage, and safety.