Drug: Clindamycin; Drug: Metronidazole. Outcome Measures: To compare the efficacy between oral Clindamycin Vs Metronidazole in ... Comparison Between Oral Clindamycin Vs Metronidazole for the Treatment of Abnormal Vaginal Flora in High Risk Pregnancies ... Abnormal Vaginal Flora; Clindamycin Vs Metronidazole; High Risk Pregnancies for Preterm Labor. ... Drug: ampicillin and metronidazole and gentamicin; Drug: ampicillin and gentamicin and clindamycin; Drug: gentamicin and ...