Patient description: 19 yo Hispanic female G1P1 at 32+ 6 weeks of gestational age presented to the OB clinic for routine follow up complaining of mild headache and leg swelling. Primary evaluation revealed BP of 146/99 and urine dipstick with 3+ proteins. Her BP and U/A were normal in previous visit. Repeat BP a few hours later is 150/100 mmHg. Laboratory studies showed a normal hematocrit, platelet count, and liver transaminase levels. She is complaining of fatigue but no fever or chills. She is also suffering of headaches with no vision changes. No shortness of breath, cough, chest pain, orthopnea and palpitations or skin rash were observed. Her physical exam was negative for abdominal pain, change in bowel habits, nausea, vomiting, dysuria, frequency, hematuria or frothy urine. Leg swelling was observed with no arthralgia or back pain. She has no specific past medical issues and only uses prenatal vitamins. Her family history is positive for DM type 2 and HTN. She is a social alcohol consumer with the negative history of smoking or drug use. She is only have one partner in past 2 years and didn't have any contraceptive methods since 2 years ago. Her BMI was 24 at the first

Clinical trial eligibility criteria: eligible ages (years): 16.0-50.0,  Bacterial Vaginosis Women will be included whether their complaint is symptoms of BV and have a positive whiff test/vaginal swab or if they have a positive whiff test/vaginal swab and are then asked if they have any symptoms of BV present. The following must be met for enrolment in the study: 1. ages 16-50 and premenopausal; 2. capable of giving written informed consent; 3. English speaking; 4. negative pregnancy test on enrolment day; 5. agree to follow study protocol; 6. documented BV infection by positive vaginal swab +/ positive whiff test/pH > 4.5; 7. agree to no intercourse for the 10 days of treatment (or to use non-lubricated condoms if unavoidable); 8. agree not to douche or use any intravaginal products during treatment (including tampons, medications, devices); 9. abstain from alcohol during the 10 days of treatment (from 24 hours before through 72 hours after taking study medication); 10. agree to no new medications or antibiotics during treatment; 11. no current sexually transmitted infection as determined by history, physical exam and negative swabs for chlamydia, gonorrhea, candidiasis, trichomonas; 12. patient is reliable for follow up  The following women would be excluded from study participation: 1. less than 16 or post-menopausal; 2. negative vaginal swab regardless of whiff test/pH > 4.5; 3. menstruating at diagnosis; 4. symptoms so severe as to make allocation to placebo unacceptable to the patient; 5. currently pregnant or at high risk for pregnancy; 6. current sexually transmitted infection (HIV, hepatitis, chlamydia, gonorrhea, trichomonas, HPV or HSV); 7. current yeast infection as determined by history, physical and swabs; 8. history of PID; 9. allergy to latex or metronidazole; 10. presently lactating; 11. any open wound, excoriation, vaginal irritation and including bartholin's cyst/abscess as determined by physical exam; 12. presence of another vulvar, vaginal or medical condition, including cervical neoplasia treatment, that might confound treatment response; 13. using lithium, anti-coagulants or disulfiram drugs; 14. any antifungal or antibiotic use 14 days prior to enrolment 15. PAP smear done within one week of enrollment