Cephalexin Medications

Cephalexin Info

What is Cephalexin?

Cephalexin belongs to the cephalosporin group of antibiotics. It is designed to stop certain types of bacteria from growing, helping the body clear infections. In the UK, cephalexin is available as a generic medicine and under a few brand names.

Medications that contain Cephalexin

Several tablets, capsules and liquid preparations list cephalexin as the active ingredient. Common products you may see on a pharmacy shelf include:

• Keflex - a brand-named tablet often supplied in 250 mg and 500 mg strengths.
• Keftab - another branded tablet with similar dosing options.
• Cephalexin - the generic name, which may be sold by different manufacturers in both solid and oral-suspension forms.

These medicines are offered in standard tablet shapes as well as oral suspensions for those who prefer a liquid. Availability can differ between pharmacies, but all contain the same core ingredient, cephalexin.

Conditions treated with Cephalexin

Cephalexin is used to manage a range of bacterial infections. The most common conditions include:

• Skin infections - such as cellulitis, impetigo or infected wounds.
• Respiratory tract infections - including bronchitis, throat infections and certain ear infections.
• Urinary tract infections - where bacteria have entered the bladder or kidneys.
• Bone and joint infections - like osteomyelitis, when bone tissue becomes infected.

These conditions are typically caused by bacteria that respond well to cephalexin, allowing the body’s immune system to clear the infection more effectively.

How Cephalexin works

When you take cephalexin, the medicine travels through the bloodstream to the site of infection. It interferes with the bacterial cell wall, weakening it so the bacteria cannot survive. This action helps stop the spread of the infection and gives your immune system a chance to finish the job. Effects are usually noticed within a few days, though full recovery may take longer depending on the infection’s severity.

Safety and side-effects

Common side-effects

Most people experience only mild, short-lasting reactions. Typical reports include:

• Stomach upset or mild diarrhoea.
• Nausea or a feeling of fullness.
• Minor skin rashes that resolve on their own.

These symptoms are generally not a cause for concern, but they should be noted if they persist.

Rare but serious reactions

In uncommon cases, more severe problems can arise. Watch for:

• Difficulty breathing, swelling of the face or throat, or a sudden rash - possible signs of an allergic reaction.
• Severe diarrhoea that may contain blood or be watery for several days.

If any of these signs appear, it is important to seek immediate medical attention.

Who should be cautious

Certain groups need to be especially careful with cephalexin-containing medicines:

• People with a known allergy to penicillins or other cephalosporins.
• Individuals with severe kidney problems, as the drug is cleared through the kidneys.
• Pregnant or breastfeeding people should discuss use with a healthcare professional, as the medication does cross the placenta and can appear in breast-milk.

Interaction awareness

Cephalexin can interact with other medicines or substances. General points to remember:

• Some other antibiotics or blood-thinning agents may affect how cephalexin works.
• Alcohol does not directly worsen side-effects, but excessive drinking can increase stomach irritation.
• Certain foods, such as large amounts of calcium-rich products, might reduce absorption if taken at the same time.

For a complete list of interactions, refer to the specific product’s information leaflet.

Key points to remember

• Cephalexin is a widely used antibiotic found in products like Keflex, Keftab and generic cephalexin tablets or suspensions.
• It treats common bacterial skin, respiratory, urinary and bone infections.
• Most side-effects are mild, but rare allergic reactions require urgent care.
• People with kidney issues, known allergies or who are pregnant should take extra care.
• Storage should be in a cool, dry place away from direct light, and follow the packaging instructions for each product.

For detailed usage, dosing and administration, see the specific medication’s information.

Information disclaimer

This article provides general educational information about cephalexin as an active substance used in various medicines. Its purpose is to help patients understand the ingredient and the conditions it is used to treat. It is not a substitute for professional medical advice or for the specific instructions provided with individual products. Medicines containing cephalexin may differ in formulation, strength, and directions for use. Always consult the labeling of your particular medication and follow your healthcare provider’s guidance for complete information on proper use, dosage, and safety.