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Completed

NCT Number: NCT01753115

Ciprofloxacin BioThrax Co-Administration Study

The purpose of this clinical trial is to determine whether there is any effect on the antibiotic, ciprofloxacin when taken before and after administration of a 3-dose series of BioThrax® (Anthrax Vaccine Adsorbed or AVA).

This study will be conducted in the United States (US) in 154 healthy male and female volunteer subjects ages 18 to 45.

The duration of study participation for each subject will be approximately 76 days (approximately 2.5 months)

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Key information

Age range

18 year–45 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Phase 2

Primary location

The Center for Pharmaceutical Research, Kansas City, Missouri, United States

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About this study

BioThrax is the only FDA-licensed vaccine for the prevention of anthrax infection. This is a randomized, open-label, Phase 2, multi-center trial to investigate the potential interactions of ciprofloxacin and BioThrax.

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Be between 18 and 45 years of age, at the time of enrollment
  • Be in good health as determined by the investigator from medical history and a physical examination.
  • If a pre-menopausal female, must be using acceptable methods of birth control.
  • Be willing and able to return for all follow-up visits and blood and urine collections for the duration of the trial
  • Be willing and able to complete a web-enabled electronic diary and report concomitant medications, adverse events, and BioThrax reactogenicity events during the trial
  • Be able to understand and communicate in English.

Exclusion criteria

  • Prior immunization with anthrax vaccine or known exposure to anthrax organisms
  • Intend to enlist in the military during the study.
  • Have a known allergy to aluminum hydroxide, formaldehyde, benzethonium chloride, or latex.
  • Plan to receive experimental products 30 days prior to study entry or at any time during the study
  • Have received a live vaccine in the 30 days before study entry
  • Plan to receive a live vaccine at any time during the study.
  • Have ongoing drug abuse/dependence (including alcohol) issues and/or test positive in a urine drug screen for amphetamines, barbiturates, cocaine or opiates
  • Have received immunosuppressive therapy (including systemic steroids) within 30 days prior to trial entry
  • Have any other condition known to produce or be associated with immunosuppression
  • Have received cytotoxic therapy in the previous 5 years
  • A chronic condition that, in the opinion of the Investigator, would render vaccination unsafe or would interfere with trial evaluations or completion of the study.

Treatment and study plan

BioThrax

Biological

route of administration/schedule- 0.5 mL subcutaneous (SC) injection / 0-2-4 week schedule

Other names: Anthrax Vaccine Adsorbed, AVA

Ciprofloxacin

Drug

500 mg twice a day (Days 1-6, 19-21, 33-35, 40-48).

Primary outcomes

  1. Ratios of Ciprofloxacin Area Under the Curve and Cmax (Day 5/Day 44)

    Time frame: Day 5 and Day 44 in Arm 1

    Ratios of Area Under the Curve from zero to 12 hours (AUC0-12h) and maximum concentration (Cmax) achieved for ciprofloxacin (Day 5/Day 44).

Secondary outcomes

  1. Geometric Mean Titer (GMT) of Toxin Neutralizing Antibody (TNA) Levels

    Time frame: Two weeks after last vaccination

    Blood was collected in arms 1 and 2 at day 48 ( 2 weeks following last vaccination) and in arm 3 at day 43 ( 2 weeks following last vaccination) for TNA assay to determine the NF50 antibody titer for calculating GMT.

Sponsors and collaborators

Lead sponsor

Emergent BioSolutions

Industry

Collaborators

  • Department of Health and Human Services

Registry information

Official study title

A Study of The Effects of Co-Administering Ciprofloxacin and BioThrax on the Pharmacokinetics of Ciprofloxacin in Healthy Adults

Important dates

Study start
2012
Primary completion
2013
Study completion
2013
First posted
Dec 20, 2012
Registry last updated
Jun 15, 2025

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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