<prompt> Drug not causing exatithematous skin eruptionPhenytoinHydrocortisoneAmpicillinPhenylbutazone  <response>: Drugs causing exanthematic reactionsMost common : - Ampicillin and penicillin, Phenylbutazone and other pyrazolones, Sulphonamides, Phenytoin,Carbamazepine, Gold, Gentamicin, Meprobamate, AtropineLess common : - Cephalosporins, Barbiturates, Thiazides, Naproxen, Isoniazid, Phenothiazines, Quinidine. 