What it is used for
- Skin and soft-tissue infections
- Some urinary tract infections
- Ear, throat and respiratory infections
- Certain bone infections
- Some dental infections
How it works
Cephalexin is a cephalosporin antibiotic, related to penicillins. It stops bacteria from building their cell walls, causing them to break apart and die. It works against bacteria, not viruses.
How it is taken
Comes as capsules, tablets and a liquid (oral suspension). Take it exactly as your doctor or pharmacist directs and follow the label. It can be taken with or without food; taking it with food may reduce stomach upset. Complete the full course as advised.
No doses here on purpose. The right strength and schedule depend on you — only a doctor or pharmacist should set them. Always follow your prescription and the label.
Common side effects
- Diarrhoea
- Nausea
- Stomach upset
- Vomiting
- Thrush
- Headache
Serious effects — get help
- Severe allergic reaction with swelling of the face or throat or breathing difficulty
- Severe, persistent or bloody diarrhoea
- Severe blistering or peeling skin reactions
- Yellowing of the skin or eyes
- Unusual bleeding or bruising
If a reaction is severe — for example trouble breathing, swelling of the face or throat, or collapse — go to the nearest emergency room now or call your local emergency number. Do not wait for an online consultation.
Interactions to watch
- Blood thinners such as warfarin
- Metformin
- Probenecid
- Some live vaccines
- Other antibiotics
Who should take care
- Tell your clinician about any penicillin or cephalosporin allergy
- Tell your clinician if you have kidney problems
- Discuss pregnancy or breastfeeding with your doctor or pharmacist
- Mention all other medicines you take
- Complete the course even if you feel better