For a rational utilisation of antimicrobial drugs in pregnancy it is necessary to follow the FDA criteria. Thus, could be used safely (class B): penicillins, cephalosporins carbapenems (meropenem, doripenem, ertapenem), inhibitors of beta-lactamase, macrolides (erythromycin, azithromycin), lincosamides, glycopeptides (vancomycin) nitroimidazoles (metronidazole), nitrofurans (nitrofurantoin), antituberculous drugs (rifabutin, ethambutol), antimicotics (ciclopirox, terbinafine, oxiconazol, miconazol, clotrimazol, amphotericin B, nystatin). In vitale situations (class C) could be recommended imipenem, clarythromicine, diritromycine, spiramycine, gentamicin, amikacine, tobramycin, chloramphenicolo, ciprofloxacine, ofloxacine, levofloxacine, moxifloxaine, norfloxacine, linsolid, furasolidon, co-trimoxasole, rifampicine, rifampentine, isoniaside, etionamide, piratinamide, griseofulvine, capsofungine, micafungine, fluconasol, itraonasol, ketkonasol, eonasol, fluocitozine. Absolute contraindicated are: streptomycin, kanamycin, tetraycline, oxytetracycline, metacycline, doxicyline (especially in IInd and IIIrd trimesters), voriconasol.