title: Lack of a Pharmacokinetic Interaction Between SYM-1219 Granules Containing 2 Grams of Secnidazole and a Combined Oral Contraceptive in a Phase 1, Randomized, Open-Label Study in Healthy Female Volunteers.
abstract: Bacterial vaginosis (BV) is a serious infection that is the most common vaginal infection in women of childbearing potential. SYM-1219 is a novel, granule formulation containing 2 g of secnidazole that is being developed as a single, oral dose to treat women with BV. Because many of the women diagnosed with BV use hormonal contraception, the effect of SYM-1219 on the pharmacokinetics (PK) of commonly prescribed oral contraceptive drugs, ethinyl estradiol (EE2), and norethindrone (NET) was evaluated.
  
  
  
  This two-period, randomized, open-label study examined effects in 54 healthy female subjects. During the first period of the study, each subject received EE2 0.035-mg/NET 1-mg tablets. During the second period of the study, subjects were randomized to receive either EE2 0.035-mg/NET 1-mg tablets with concomitant 2-g SYM-1219 or 2-g SYM-1219 followed by EE2 0.035-mg/NET 1-mg tablets 1 day later. The PK of EE2 and NET were analyzed for 24 h following administration.
  
  
  
  Coadministration of SYM-1219 and EE2/NET, either on the same day or 1 day apart, had no clinically relevant effects on the bioavailability of EE2 or NET. The combined use of SYM-1219 with EE2/NET was well tolerated. Taken together, these results indicate that contraceptive efficacy should be maintained during coadministration of SYM-1219 and EE2/NET.
  
  
  
  SYM-1219 is a valuable single-dose treatment option for women with BV that will not interfere with combined oral contraceptive methods.
  
  
  
  Symbiomix Therapeutics.
authors.affiliation: Symbiomix Therapeutics, LLC, 1101 E. 33rd Street, Suite E306, Baltimore, MD, 21218, USA. hpentikis@symbiomix.com.
authors.forename: Helen S
authors.initials: HS
authors.lastname: Pentikis
authors.affiliation: Symbiomix Therapeutics, LLC, 1101 E. 33rd Street, Suite E306, Baltimore, MD, 21218, USA.
authors.forename: Nikki
authors.initials: N
authors.lastname: Adetoro
authors.affiliation: Symbiomix Therapeutics, LLC, 1101 E. 33rd Street, Suite E306, Baltimore, MD, 21218, USA.
authors.forename: Carol J
authors.initials: CJ
authors.lastname: Braun
mesh_terms: D000328:Adult; D003277:Contraceptives, Oral, Combined / Q000493:pharmacokinetics*; D004347:Drug Interactions; D004997:Ethinyl Estradiol / Q000493:pharmacokinetics*; D005260:Female; D006801:Humans; D008795:Metronidazole / Q000009:adverse effects / Q000031:analogs & derivatives* / Q000493:pharmacokinetics / Q000627:therapeutic use; D008875:Middle Aged; D016585:Vaginosis, Bacterial / Q000188:drug therapy*
chemical_list: D003277:Contraceptives, Oral, Combined; D008795:Metronidazole; D004997:Ethinyl Estradiol; C016724:secnidazole
keywords: Bacterial vaginosis; Clinical trial; Infectious diseases; Oral contraceptives; Pharmacokinetics; Secnidazole