Keftab (Cephalexin) – Patient-Friendly Guide (Australia)

Keftab is a brand of cephalexin, a type of antibiotic medicine in the cephalosporin group. It is used to treat certain bacterial infections in adults and children. This guide explains how cephalexin works, what it’s used for, how to take it safely, common side effects, and practical tips for getting the best results.

Important: Antibiotics like cephalexin are for bacterial infections only. They do not treat viral illnesses such as colds or flu.

Quick Product Information

How Keftab (Cephalexin) Works (Mechanism of Action)

Cephalexin works by interfering with how bacteria build and maintain their cell walls. Bacterial cell wall formation relies on specific proteins and pathways. Cephalexin binds to penicillin-binding proteins (PBPs), which weakens the bacterial cell wall and makes it easier for the bacteria to die.

What this means for you: Once the antibiotic reaches the infection site and begins working, many people notice symptom improvement within 24–48 hours for susceptible infections. However, it is still important to finish the full course as directed.

Pharmacokinetics (How the Medicine Moves Through the Body)

Pharmacokinetics describes what the body does to a medicine—absorption, distribution, metabolism, and elimination.

• Absorption: Cephalexin is absorbed after oral administration. Taking it at consistent intervals helps maintain effective levels.
• Distribution: It distributes into body tissues and fluids, reaching sites of common bacterial infections.
• Metabolism: Cephalexin is not extensively metabolised.
• Elimination: The medicine is mainly eliminated by the kidneys through urine. Kidney function can affect how quickly it leaves the body.

Clinical relevance: If you have reduced kidney function, your prescriber may adjust the dose or schedule. If you are unsure about your kidney health, discuss this before starting treatment.

Typical Uses and Indications

Keftab (cephalexin) may be used for uncomplicated infections caused by susceptible bacteria. Common indications include:

• Skin and soft tissue infections (e.g., uncomplicated cellulitis, impetigo depending on local guidance)
• Respiratory tract infections when caused by susceptible organisms (your clinician will consider local patterns)
• Urinary tract infections (UTIs) in selected cases
• Ear infections (otitis media) in selected situations
• Dental-related infections when appropriate and when bacterial susceptibility is likely
• Bone or joint infections under medical direction for selected cases

Note: Cephalexin is not effective against all bacteria. In some areas, organisms that commonly cause infections may be resistant. Your clinician may choose an alternative antibiotic based on the likely cause, severity, and local resistance patterns.

Timing and How to Take Keftab

To maximise benefit, take cephalexin exactly as directed. The following general guidance can help you stay on track.

Typical dosing schedule

Cephalexin regimens vary by infection type, age, and kidney function. Common schedules in practice may include:

• Multiple times per day (for example, every 6 hours or every 12 hours), depending on the prescribed strength and regimen.

Follow your specific instructions on the medicine label or accompanying documentation.

How to space doses

• Try to take doses at evenly spaced times (e.g., morning/evening or throughout the day).
• Set alarms if you have a busy schedule.
• If you miss a dose, take it when you remember unless it is nearly time for the next dose. Avoid taking a double dose.

How long to take it

The duration depends on the infection. Many common courses range from about 5–14 days depending on diagnosis and clinical response. Some infections require longer courses.

Do not stop early simply because you feel better. Stopping too soon can increase the chance of the infection returning or not clearing fully.

Food Interactions (Can You Take Keftab With Meals?)

Cephalexin is generally well tolerated with or without food. Many people find that taking it with food helps reduce stomach upset.

• With food: Often improves tolerance (nausea, stomach discomfort).
• Without food: May still be acceptable for many people.

Practical tip: Choose a consistent routine—either always with meals or always on an empty stomach—unless your clinician or pharmacist advises otherwise.

Alcohol and Medicine Interactions

Cephalexin is not known for a specific “disulfiram-like” reaction with alcohol (a reaction seen with some other medicines). However, alcohol can still affect recovery and can worsen side effects like:

• nausea or stomach discomfort
• dizziness or fatigue

Recommendation: If possible, limit alcohol while you’re being treated and especially while you have symptoms of infection. Ask your pharmacist for advice if you plan to drink or if you have liver or kidney conditions.

Medicine Interactions (What to Tell Your Pharmacist)

Most people can take cephalexin without major drug interactions, but it’s important to check your medicines—especially if you take multiple medications or have long-term conditions.

Tell your pharmacist or clinician if you use:

• Probenecid (may affect cephalexin levels)
• Blood-thinning medicines (e.g., warfarin) – antibiotics can affect bleeding risk in some people; monitoring may be needed
• Other antibiotics or recent antibiotic courses
• Kidney-related medicines if you have reduced renal function
• Oral contraceptives: while cephalexin is not a classic interaction like some enzyme-inducing antibiotics, any severe diarrhoea or vomiting can reduce absorption of oral contraceptives. Consider backup contraception if significant gastrointestinal upset occurs.

Always check labels for ingredients and keep an up-to-date list of your medicines, vitamins, and herbal products.

Dosing Information (General Guidance)

Dose depends on the infection type, severity, age, and kidney function. Only use dosing information from your clinician or pharmacy documentation for your specific situation.

Below are general example ranges sometimes used in clinical practice. These are not a substitute for personalised instructions.

Adults

• Common regimens vary by indication and may total a daily dose that is split into multiple administrations.
• For some infections, typical adult dosing in practice may be around 500 mg up to four times daily or similar total daily doses, depending on the prescription.

Children

• Paediatric dosing is often calculated by weight (mg/kg).
• The dosing frequency and duration depend on the diagnosis and age.

Kidney impairment

• If you have impaired kidney function, the dosing interval or dose may be adjusted.
• Tell your clinician/pharmacist if you’ve ever been told you have reduced kidney function.

Missing doses

• If you miss a dose, take it as soon as you remember unless the next dose is close.
• Do not take two doses at once to make up for the missed dose.

Safety Profile and Side Effects

Like all medicines, Keftab (cephalexin) can cause side effects. Many people experience none or only mild effects.

Common side effects

• Diarrhoea or loose stools
• Nausea
• Vomiting
• Stomach cramps
• Headache
• Rash (mild skin reactions can occur)

Serious side effects (seek urgent medical help)

• Allergic reaction (swelling of face/lips, difficulty breathing, wheezing, severe hives)
• Severe or persistent diarrhoea (especially watery or bloody) which may signal antibiotic-associated colitis
• Severe skin reactions (blistering, peeling, painful rash)
• Signs of liver issues (yellowing of skin/eyes, dark urine, severe fatigue—rare)

Penicillin/cephalosporin allergy warning: If you have had an allergic reaction to cephalosporins or other beta-lactam antibiotics, speak to a clinician before taking cephalexin.

Who should be extra cautious?

• People with a history of severe allergic reactions to antibiotics
• People with kidney disease
• People with previous antibiotic-associated diarrhoea/colitis
• People who are immunocompromised or have complex health conditions

Practical Tips for Using Keftab Successfully

• Start strong: Take the first dose at the scheduled time and maintain the spacing between doses.
• Complete the course: Even if you feel better, finish as directed.
• Hydrate: Especially if you have diarrhoea or are unwell.
• Track symptoms: Note improvement and any new side effects. If symptoms worsen after 48 hours or fail to improve, seek advice.
• Manage diarrhoea carefully: Mild, short-lived diarrhoea can occur. Seek medical advice if it is severe, persistent, or includes blood/mucus.
• Avoid sharing antibiotics: Use antibiotics only for the condition they were prescribed for.
• Don’t double up: If you miss a dose, follow the missed-dose guidance—avoid extra doses unless told.

Alternative Options (Discuss With Your Clinician/Pharmacist)

If cephalexin isn’t suitable (for example, due to allergy, resistance concerns, or specific infection type), alternative antibiotics may be considered depending on the diagnosis and susceptibility.

Examples of alternative antibiotic classes (not exhaustive):

• Penicillin-based antibiotics (for certain susceptible infections)
• Amoxicillin/clavulanate (when broader coverage is needed)
• Macrolides (e.g., for selected respiratory infections)
• Clindamycin (for certain skin/soft tissue situations)
• Trimethoprim-sulfamethoxazole (some urinary/skin scenarios depending on local resistance and suitability)

Non-antibiotic supportive care is also important—rest, fluids, pain and fever control, and proper wound care when relevant.

Because the best alternative depends on the infection and local resistance patterns, your pharmacist or clinician can help choose the most appropriate option.

Australia Context: Availability, Prescribing Pathway, and Guidance

In Australia, cephalexin products such as Keftab are used in accordance with accepted clinical practice and antimicrobial stewardship principles. Antibiotics should be used only when clearly indicated to help reduce resistance and protect individual and community health.

Market/legal context (general)

• Antibiotics in Australia are regulated medicines; supply is typically managed through appropriate clinical pathways.
• Pharmacies may require specific documentation for supply depending on product category and regulations at the time of order.
• Always check the product page and your pharmacy’s requirements before placing an order.

Recent guidance considerations

Australian health authorities emphasise appropriate antibiotic use, including:

• using antibiotics only when bacterial infection is likely
• choosing the narrowest effective therapy where possible
• reviewing antibiotic need if symptoms don’t improve
• preventing unnecessary use to support long-term resistance control

Delivery and Availability (Online Pharmacy)

Many online pharmacies in Australia can deliver medicines to eligible locations. Availability and delivery timeframes may vary based on:

• stock levels and strength/form of Keftab
• your delivery address (metro vs regional/remote)
• order processing times and cut-off times
• any additional checks required for the product

Delivery tips:

• Ensure you provide accurate address details and a contact number.
• Be available for delivery if required (signature/secure drop rules may apply).
• Check packaging on arrival and avoid using damaged products.

If you’re trying to order Keftab, the product page typically lists current stock status and estimated delivery options.

FAQ – Common Questions About Keftab (Cephalexin)

1) What is Keftab used for?

Keftab (cephalexin) is used to treat certain bacterial infections such as skin infections, urinary tract infections, and some other infections where cephalexin is appropriate. The exact indication depends on your diagnosis and local bacterial susceptibility.

2) How quickly should I feel better?

Many people start to feel improvement within 24–48 hours. If you are not improving, or symptoms worsen after this time, contact your clinician or pharmacist for advice.

3) Can I take Keftab with food?

Yes. Cephalexin can usually be taken with or without food. Taking it with food may help reduce nausea or stomach upset. Try to keep a consistent routine.

4) What if I miss a dose?

Take the missed dose as soon as you remember unless it is close to your next dose. Do not take a double dose to make up for the missed one.

5) Can I drink alcohol while taking cephalexin?

There is no commonly known direct interaction that makes alcohol unsafe specifically with cephalexin, but alcohol may worsen side effects and delay recovery. It’s best to limit alcohol while you’re unwell and during treatment.

6) Does cephalexin interact with other medicines?

Some medicines may affect cephalexin levels or increase side effects. In particular, tell your pharmacist if you take anticoagulants (like warfarin), probenecid, or other medicines that affect the kidneys. If you have a large medicine list, share it for a thorough check.

7) What side effects are normal?

Mild stomach upset, nausea, and diarrhoea can occur. If side effects are mild and improving, they may resolve as your body adjusts. Seek medical advice if they become severe or persistent.

8) When should I seek urgent help?

Seek urgent medical help if you have signs of an allergic reaction (breathing difficulty, facial swelling, severe hives), severe skin reactions, or severe/persistent diarrhoea (especially if watery or bloody).

9) Is it safe for children?

Cephalexin is used in children when appropriate. Dosing is usually based on weight and the infection type. Always follow the specific instructions provided for the child’s regimen.

10) Can I stop early if I feel better?

No. Even if you feel better, you should generally complete the full course as directed to reduce the risk of the infection returning or not fully clearing.

Summary

Keftab (cephalexin) is an oral antibiotic used for certain bacterial infections. It works by disrupting bacterial cell wall formation, helping the infection resolve. It is typically well tolerated, but like all antibiotics it can cause side effects, including gastrointestinal upset and, rarely, serious allergic reactions or antibiotic-associated diarrhoea.

For the safest and most effective treatment, take cephalexin as instructed, keep doses evenly spaced, finish the course, and seek medical advice if you develop severe symptoms or do not improve within 48 hours.

Need help choosing the right approach? Contact your pharmacist to discuss your condition, medicine list, allergies, and any kidney-related concerns.