Phenoxymethylpenicillin
Also sold as: Ospen
Prescription neededPenicillins
Comes as:TabletSuspension
Usual adult dose
Usual adult dose: 250 to 500 mg every 6 hours on an empty stomach. For a strep sore throat it is usually taken for 10 days. Finish the full course. Children: dose by age or weight — ask your doctor or pharmacist.
Your doctor may give you a different dose. Children's doses depend on weight.
Side effects
Common
- diarrhoea
- nausea
- mild skin rash
Serious — get help
Stop taking it and see a doctor straight away if you notice:
- severe allergic reaction (swelling of face or throat
- difficulty breathing)
- severe or bloody diarrhoea
Do not take it, or take care, if
- Allergy to penicillin or any penicillin-type antibiotic
- Previous severe allergic reaction to a cephalosporin (use with caution)
Interactions
Medicines that can react with this one.
Moderate1 medicineTake together only with care. Ask your doctor or pharmacist.
- Methotrexate
Penicillins can reduce methotrexate clearance and raise its toxicity.