There are many causes of chest pain
. You have`nt elaborated on your symptoms like do you also have cough, fever
, phlegm etc. Why are you taking flucloxacillin? Are you suffering from pneumonitis
which could cause this kind of pain. It could be muculoskeletal also. Did you hurt yourself. No, flucloxacillin cannot cause this kind of pain. You should get a chest x ray
done and consult a physician/pulmonologist for proper advice.