Chlamydia trachomatis is the most frequent sexually transmitted bacterial pathogen in developed countries [3, 12, 13]. The position is similar in the Czech Republic. Depending on the group of examined women active Chlamydia infection varies between 10 and 23%. The increasing incidence of urogenital Chlamydia infections and improving diagnostic possibilities call for adequate treatment. Correct treatment of urogenital infections caused by Chlamydia trachomatis is very important for the prevention of undesirable sequelae of inflammations of the lesser pelvis, subsequent risk of GEU, sterility, prevention of premature delivery and possible infection of the neonate. When starting treatment, selecting a suitable antibiotic and deciding on the therapeutic strategy it is important to select an antibiotic with regard to its efficacy, the epidemiological situation, regional sensitivity of the infectious agent, toxicity and tolerance of the antibiotic, to its bacteriostatic or bactericide action, and last not least, also its price. Despite selection of a suitable antibiotic sometimes treatment fails. For treatment of urogenital chlamydial infections tetracyclin and macrolid antibiotics are recommended or quinolone chemotherapeutic agents of the third generation. Tetracyclines are broad spectrum antibiotics with bacteriostatic action. As to oral forms doxycycline, tetracycline and oxytetracycline are used. The most frequent undesirable effects during treatment are nausea, vomiting, diarrhoea and abdominal pain. Tetracycline antibiotics are contraindicated in children under 8 years, during pregnancy and lactation and in case of sensitivity to this group of drugs. Macrolids are antibiotics with a medium broad antibacterial spectrum with bacteriostatic action. Macrolids of the first generation have a low antibacterial activity. They have a short biological half-life, not always a good tolerance, and serious clinically important drug interactions may develop. The most frequently used preparations of the first generation include erythromycin, josamycina and spiramycin. Macrolids of the second generation, azitromycin, roxitromycin and claritromycin lack the above negative properties. The most frequent undesirable effects after administration of macrolids include nausea and vomiting. Considerable differences were found in particular between different preparations containing erythromycin. Macrolids of the second generation have only slight undesirable gastrointestinal effects. Macrolid antibiotics are contraindicated in case of sensitization to this group, in severe hepatic disorders and great care must be taken in the treatment of pregnant women. Quinolone chemotherapeutic agents of the third generation, ciprofloxacine, enoxacine, ofloxacine and pefloxacine are synthetic drugs with a broad antibacterial spectrum which act on systemic infections. On oral administration they are rapidly absorbed and the blood and tissue concentrations are sufficiently effective. In the treatment of urogenital Chlamydia infections they are useful in the treatment of chronic infections after failure of previous macrolid and tetracycline therapy. The most frequent undesirable side-effects include nausea, vomiting, meteorism, diarrhoea, tinnitus, headache, changes of mood, allergic skin reaction. They are contraindicated in hypersensitivity to quinolone chemotherapeutic preparations, in children and adolescents under 18 years, during pregnancy and lactation. The objective of the present study was to evaluate different therapeutic patterns, their efficacy and tolerance.