Four trials, two from Africa (n=1485 and 1813), one from Turkey, and one from Los Angeles (n=1867), were included in a Cochrane review [Abstract] 1. The odds ratio for pelvic inflammatory disease associated with use of prophylactic doxycycline or azithromycin compared with placebo or no treatment was 0.89 (95% CI 0.53 to 1.51). Use of prophylaxis was associated with a small reduction in unscheduled visits to the provider (OR 0.82; 95% CI 0.70 to 0.98). These benefits were mainly drawn from a Kenyan trial, where the prevalence of gonorrhea and chlamydial infection was high. Use of doxycycline or azithromycin had little effect on the likelihood of removal of the IUD within 90 days of insertion (OR 1.05, 95% CI 0.68 to 1.63). The risk of infection following IUD insertion was low in all studies.
Comment: The quality of evidence is downgraded by inconsistency of results; heterogeneity of results in different populations.
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