This study is being conducted to evaluate the pharmacokinetic (PK) and safety of Kimyrsa versus the approved oritavancin formulation in subjects with acute bacterial skin and skin structure infection (ABSSSI). Kimyrsa adjusts the infusion time, concentration and reconstitution/administration solutions of a single 1200 mg intravenous (IV) infusion of oritavancin

Single IV dose oritavancin (1200 mg) has been approved in the U.S. for the treatment of adult patients with ABSSSI caused or suspected to be caused by Gram-positive microorganisms. The current study is being conducted to evaluate the relative exposure, PK and safety of a new formulation of oritavancin, Kimyrsa, by adjusting infusion time, concentration and reconstitution/administration solutions of a single 1200 mg IV infusion of oritavancin in adult subjects with ABSSSI.

Fifty (50) subjects will be administered the currently approved formulation of oritavancin, using the approved dosing regimen in which Sterile Water for Injection (SWFI) is the reconstituting agent and Dextrose 5% in Water (D5W) is used for further dilution to a total volume of 1000 mL. This formulation will be infused per the approved label over 3 hours. An additional 50 subjects will be administered Kimyrsa which contains hydroxypropyl-β-cyclodextrin (HPβCD). This formulation will be reconstituted with SWFI and further diluted in 0.9% sodium chloride (saline) to a total volume of 250 mL. This formulation will be infused over 60 minutes.

Inclusion Criteria:

Subjects may be included in the study if they meet all of the following criteria:

1. Subject must be 18 years of age or older, male or female, and of any race.
2. Subject must give written informed consent before initiation of any study-related procedures.
3. Diagnosis of ABSSSI (wound infections, cellulitis/erysipelas, or cutaneous abscess) suspected or confirmed to be caused by a Gram-positive pathogen requiring IV therapy.
4. If female, the subject is surgically sterile, postmenopausal, or, if of childbearing potential, agrees to use at least 2 highly effective methods of birth control (e.g. prescription oral contraceptives, contraceptive injections, contraceptive patch, intrauterine device, barrier methods, abstinence) for the duration of the study until 60 days after study drug administration, or male partner sterilization alone.
5. Subject must express a commitment to comply with all study visits, procedures and requirements for the duration of the study.

Exclusion Criteria

Subjects will be excluded from the study if any of the following exclusion criteria apply prior to randomization:

1. Infections associated with, or in close proximity to, a prosthetic device.

2. Severe sepsis or refractory shock.

3. Known or suspected bacteremia at time of screening.

4. ABSSSI due to or associated with any of the following:

   1. Infections suspected or documented to be caused by only Gram-negative pathogens (i.e., infections acquired during prolonged admission in hospital or long-term care facilities).
   2. Diabetic foot infections (infection extending distal to the malleoli in a subject with diabetes mellitus and peripheral neuropathy and/or vascular insufficiency or any ulceration of their foot).
   3. Concomitant infection at another site not including a secondary ABSSSI lesion (e.g., septic arthritis, endocarditis, osteomyelitis).
   4. Infected burns.
   5. A primary infection secondary to a pre-existing skin disease with associated inflammatory changes such as atopic dermatitis, eczema, or hidradenitis suppurativa.
   6. Decubitus or chronic skin ulcer, or ischemic ulcer due to peripheral vascular disease (arterial or venous).
   7. Any evolving necrotizing process (i.e., necrotizing fasciitis), gangrene or infection suspected or proven to be caused by Clostridium species (e.g., crepitance on examination of the ABSSSI site and/or surrounding tissue(s) or radiographic evidence of subcutaneous gas in proximity to the infection).
   8. Infections known to be caused by an organism resistant to oritavancin.
   9. Catheter site infections.

5. Treatment with investigational medicinal product within 30 days or 5 half-lives, whichever is longer, before enrollment and for the duration of the study.

6. Subjects currently receiving anticoagulant therapy.

7. Known liver function tests (LFTs) ≥ 3 times the upper limit of normal (ULN) or total bilirubin ≥ 2 times ULN.

8. Any medical condition, which in the judgment of the Investigator, might interfere with the pharmacokinetics, distribution, metabolism, or excretion of the study drug.

9. Any planned, major surgical procedure during the study period (Day 15).

10. Subject is the Investigator or his/her deputy, research assistant, pharmacist, study coordinator, other staff or relative thereof directly involved in the conduct of the study.

11. Known hypersensitivity to oritavancin, glycopeptides or HPβCD.

12. Female subject who has a positive pregnancy test or is breastfeeding.

13. Previous use of oritavancin or anticipated need to use a long acting glycopeptide during the study.

From the time of study drug initiation to Day 15

Adverse events and serious adverse events will be assessed from the time of study drug administration through Day 15 post administration of oritavancin. AEs will be collected at every subject visit.