I'm not a doctor, but the Flucloxacillin is a penicillin used against bacterial infections. So if you have a cold, which is mostly caused by a virus, it won't help. Please be cautious with penicillin, because not using it right, will cause bacteria to go resistant for it.
Always ask a doctor first before you use penicillin, and once started with it, always finish the cure, so you kill off all the bacteria in your body.
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