Medicines & Supplements A to Z > Cefalexin


Last updated on 19/03/2021.

Overview   |   Dosage   |    Side Effects   |   Precautions  |   Tips  |   Where To Buy  

GENERIC NAME: Cephalexin, Cefalexin


BRAND NAME(S) IN HONG KONG: Cefacin, Cefastad, Sofilex, Medolexin, Felexin

DRUG CLASS: First Generation Cephalosporin

USED FOR:  Urinary tract infections (UTIs), streptococcal pharyngitis, otitis media, bone and joint infections, respiratory tract infections, skin and soft tissue infections

OTHER DRUGS IN THE SAME CLASS: Cefazolin, cefadroxil, cefradine

– 250mg, 500mg (capsules)
– 250mg, 500mg (tablets)
– 125mg/5ml (oral suspension)

What is Cefalexin for?

Cefalexin is an antibiotic that is used to treat bacterial infections by interrupting the integrity of the bacterial cell walls, including uncomplicated urinary tract infections (UTIs), streptococcal pharyngitis, otitis media (inflammation of the middle ear), bone and joint infections, respiratory tract infections, as well as skin and soft tissue infections.

How to use it?

Cefalexin can be taken by mouth as tablets, capsules, and suspensions. The dosages for different age groups are listed below: 

For mild to moderate susceptible infections 

250 mg every 6 hours  OR 500 mg every 8-12 hours. 

Child 1-11 months
1.25 mg/kg twice daily OR 125 mg twice daily. 

Child 1-4 years
12.5 mg/kg twice daily OR 125 mg 3 times daily. 

Child 5-11 years
12.5 mg/kg twice daily OR 250 mg 3 times daily. 

Child 12-17 years
500 mg 2-3 times daily. 


For severe susceptible infections

1-1.5 g every 6-8 hours. 

Child 1 month – 11 years
25 mg/kg 2-4 times daily. The maximum dose is 1 g 4 times daily. 

Child 12-17 years
1-1.5 g 3-4 times daily.

What are the side effects of Cefalexin?  

Common side effects of Cefalexin include diarrhoea, nausea and vomiting, and allergic skin reactions.

Who should not take Cefalexin?

Anyone who has an allergy to Cefalexin

Pharmacist Tips:

Report severe diarrhoea and ask your doctor or pharmacist before taking anti-diarrhoea medicines.

Common dosing schedule:
Administer with or without food. If Cefalexin bothers your stomach, take each dose with food.

This schedule is for reference only, adjustments may be made according to individual needs.

Some common medications Cefalexin may interact with:

Please notify your doctor or pharmacist if you are taking the above medication, dosage adjustments might be needed.

Where to buy Cefalexin in Hong Kong?

In Hong Kong, Cefalexin is a prescription only medicine, and requires a prescription from a doctor to be purchased in a pharmacy. It can also be obtained from doctors. To find a pharmacy near you, refer to the list of pharmacies (“Authorized Sellers of Poisons”) from the Hong Kong Department of Health.

For more information about drug names and ingredients, you can visit Hong Kong’s Drug Office at

Need more information?

For detailed information about the use of Cefalexin in children, pregnancy and breastfeeding, and for questions about drug interactions, please check with your pharmacist or doctor.

Disclaimer: our goal is to provide you with the most relevant drug information and common dosage for Hong Kong. This information does not constitute medical advice. For specific treatment recommendations and advice, always discuss with your doctor or pharmacist, and follow the instructions included with your specific medicine.