I met a patient who has allergy to all types of penicillins, cephalosoprines, sulphanamides and flouroquinolones drugs. Can I advise this patient to take corticosteroids and ant-histaminic drugs before the administration of antibiotics.
No. If there is a true allergy there would still be a substantial risk. If it is vague and sounds a bit contrived I would go ahead with the one that sounds most innocent or try another unrelated antibiotic.