• The maximum mean difference between moxifloxacin and placebo in QTcF changes from baseline [ Time Frame: Baseline and up to 24 hours ]
• The maximum mean difference between each single dose of BI 409306 and placebo in heart rate (HR) changes from baseline [ Time Frame: Baseline and up to 24 hours ]
• The minimum mean difference between each single dose of BI 409306 and placebo in HR changes from baseline [ Time Frame: Baseline and up to 24 hours ]

The primary objective of this trial is to assess the effect of BI 409306 on the QT/QTc interval in healthy male and female volunteers as measured by the QTcF change from baseline compared with placebo.

Secondary objectives are to show the assay sensitivity of the trial, by reproducing the typical effect of the positive control moxifloxacin on the QT/QTc interval, and to assess the effect of BI 409306 on heart rate.

• Drug: BI 409306
  Film-coated tablet
• Drug: Moxifloxacin
  Film-coated tablet
  Other Name: Avalox®
• Drug: Placebo matching to BI 409306
  Film-coated tablet

• Experimental: Treatment 1
  Interventions:

  • Drug: BI 409306
  • Drug: Placebo matching to BI 409306
• Experimental: Treatment 2
  Intervention: Drug: BI 409306
• Experimental: Treatment 3
  Intervention: Drug: Moxifloxacin
• Experimental: Treatment 4
  Intervention: Drug: Placebo matching to BI 409306

Inclusion Criteria:

• Healthy male or female subjects according to the assessment of the investigator, based on a complete medical history including a physical examination, vital signs (Blood Pressure (BP), Pulse Rate (PR)), 12-lead single Electrocardiogram (ECG) and 12-lead Holter Electrocardiogram (ECG), and clinical laboratory tests
• Age of 18 to 50 years (incl.)
• Body mass index (BMI) of 18.5 to 29.9 kg/m2 (incl.)
• Signed and dated written informed consent prior to admission to the study in accordance with Good clinical practice (GCP) and local legislation

• Male subjects, or female subjects who meet any of the following criteria starting from at least 30 days before the first administration of trial medication and until 30 days after trial completion:

  • Use of adequate contraception, e.g. non-hormonal intrauterine device plus condom
  • Sexually abstinent
  • A vasectomised sexual partner (vasectomy at least 1 year prior to enrolment)
  • Surgically sterilised (including hysterectomy)
  • Postmenopausal, defined as at least 1 year of spontaneous amenorrhea (in questionable cases a blood sample with simultaneous levels of FSH above 40 U/L and estradiol below 30 ng/L is confirmatory)

Exclusion Criteria:

• Any finding in the medical examination (including Blood Pressure (BP), Pulse Rate (PR) or Electrocardiogram (ECG)) is deviating from normal and judged as clinically relevant by the investigator
• Repeated measurement of systolic blood pressure outside the range of 100 to 140 mmHg, diastolic blood pressure outside the range of 50 to 90 mmHg, or pulse rate outside the range of 45 to 90 bpm
• Any laboratory value outside the reference range that the investigator considers to be of clinical relevance
• Any evidence of a concomitant disease judged as clinically relevant by the investigator
• Gastrointestinal, hepatic, renal, respiratory, cardiovascular, metabolic, immunological or hormonal disorders
• Cholecystectomy and/or surgery of the gastrointestinal tract that could interfere with the pharmacokinetics of the trial medication (except appendectomy and simple hernia repair)
• Diseases of the central nervous system (including but not limited to any kind of seizures or stroke), and other relevant neurological or psychiatric disorders
• History of relevant orthostatic hypotension, fainting spells, or blackouts
• Chronic or relevant acute infections
• History of relevant allergy or hypersensitivity (including allergy to the trial medication or its excipients)
• Further exclusion criteria apply