Ibrexafungerp citrate

Ibrexafungerp citrate (MK 3118 citrate) is an orally active β-1,3-glucan synthesis inhibitor, with potential antifungal activity. Ibrexafungerp citrate is an investigational agent for the treatment of Candida and Aspergillus infections.

Ibrexafungerp citrate (MK 3118 citrate) leads to fungicidal activity against various Candida spp., with a minimum inhibitory concentration (MIC50) of 0.5 µg/mL^[2].

Pharmacokinetic Analysis
Ibrexafungerp citrate (MK 3118 citrate) exhibits oral bioavailability (mouse 51%, rat 45%, dog 35%) following oral administration (mouse 1 mg/kg, rat 5 mg/kg and dog 5 mg/kg)^[3].
Ibrexafungerp citrate (MK 3118 citrate) exhibits moderate half-lives (mouse 5.5, rat 8.7 and, dog 9.3 h) due to high plasma clearance (0.68, 0.44, and 0.45 L/h/kg respectively) combined with large volumes of distribution (5.3, 4.7, and 4.1 L/kg respectively) following intravenous administration (mouse 1 mg/kg, rat 5 mg/kg and dog 5 mg/kg)^[3].

References:
[1]. James M Apgar, et al. Ibrexafungerp: An orally active β-1,3-glucan synthesis inhibitor. Bioorg Med Chem Lett. 2021 Jan 15;32:127661.
[2]. Mahmoud Ghannoum, et al. Ibrexafungerp: A Novel Oral Triterpenoid Antifungal in Development for the Treatment of Candida auris Infections. Antibiotics (Basel). 2020 Aug 25;9(9):539.
[3]. Stephen A Wring, et al. Preclinical Pharmacokinetics and Pharmacodynamic Target of SCY-078, a First-in-Class Orally Active Antifungal Glucan Synthesis Inhibitor, in Murine Models of Disseminated Candidiasis. Antimicrob Agents Chemother. 2017 Mar 24;61(4):e02068-16.