Inclusion Criteria
1. Healthy adult males and females between 18 and 60 years of age, inclusive at the time of signing the informed consent document.
2. Female subjects fulfilled the following criteria:
1. Surgically sterile (including bilateral tubal ligation) for at least 3 months prior to screening
2. Postmenopausal, defined as 1 of the following:
* Last menstrual sequence greater than 12 months prior to screening
* Last menstrual sequence greater than 6 months prior to screening and a serum follicle-stimulating hormone (FSH) concentration \> 40 mIU/mL
3. Subjects of childbearing potential (i.e., did not meet the criteria for surgical sterility or post- menopausal status outlined above):
* Had a negative serum pregnancy test at screening and Day -1, as verified by the study doctor prior to starting study therapy
* Either committed to true abstinence from heterosexual contact or agreed to use, and was able to comply with, effective contraception without interruption with one of the following methods during the study participation up until 90 days after administration of study drug: Oral contraceptive medications, Intrauterine devices, Hormonal implants, Injectable contraceptive medications, Double barrier methods.
3. Male subjects practiced true abstinence from heterosexual contact or, during sexual contact with a pregnant female or a female of childbearing potential, agreed to use a condom.
4. Healthy, as determined by the responsible physician, based on a medical evaluation including history, physical examination, vital signs, ECGs, and laboratory tests assessed at the screening visit and prior to the first dose of study drug.
5. Body weight ≥ 50 kg and BMI within the range of 18 to 32 kg/m2, inclusive, at screening.
6. Negative urine tests for selected drugs of abuse and alcohol breath test at screening and Day 1.
7. Dietary habits that fell within the range of normal, as determined by the PI.
8. Was willing and able to be confined at the clinical research center for the study period, and adhered to overall study visit schedule, procedures and other protocol requirements.
9. Understood and voluntarily signed an ICF prior to any study related assessments/procedures being conducted.
Exclusion Criteria
Subject candidates were not enrolled in the study if they met any of the following criteria:
1. Any significant medical condition, psychiatric illness or history of depression that could have, in the PI's opinion, compromised the subject's safety or interfered with the completion of this study.
2. Any condition, including the presence of laboratory abnormalities or abnormal pulmonary function test, which according to the PI, placed the subject at unacceptable risk if he/she were to participate in the study.
3. Any condition that according to the PI confounded the ability to interpret data from the study such as a virus, seasonal allergy, concurrent skin rash, etc. at screening or prior to drug treatment phase that may have been difficult to discern from further health status changes from an investigational product.
4. History of clinically significant central nervous system (e.g., seizures), cardiac, pulmonary (e.g., asthma, chronic obstructive pulmonary disease), metabolic, renal, hepatic, or gastrointestinal (GI) conditions including gastric bypass or other weight loss surgical procedure; or history of such conditions that, in the opinion of the PI, may have placed the subject at an unacceptable risk as a participant in this trial, may have interfered with the interpretation of safety and/or tolerability data obtained in the trial, or may have interfered with the absorption, distribution, metabolism, or excretion of the study drugs.
5. Used drugs known to prolong the corrected QT interval (QTc).
6. PR interval \> 220 msec or QRS duration \> 120 msec or Fridericia's corrected QT interval (QTcF) \> 450 msec for men and \> 470 msec for women obtained at the screening visit or prior to the first dose of study drug.
7. Aspartate transaminase (AST), alanine transaminase (ALT), gamma-glutamyl transferase (GGT), serum creatinine, or total bilirubin \> 1.5 upper limit of normal (ULN) at screening or prior to the first dose of study drug.
8. Positive blood screen for HIV antibody, hepatitis B virus surface antigen (HBsAg), or hepatitis C virus (HCV) antibody at screening.
9. History of drug or alcohol abuse within 6 months of screening.
10. History of any tobacco product use within 3 months prior to the study.
11. Participation in a clinical trial and receipt of an investigational medication or a new chemical entity within 90 days, 5 half-lives, if known, or twice the duration of the biological effect of any medication (whichever is longer) prior to the first dose of current study drug.
12. Use of non-prescription medications, including herbal and dietary supplements within 5 days or 5 half-lives (whichever was longer) prior to the first dose of study drug.
13. Use of any 5-HT3 receptor antagonists or any other serotonergic drugs, including selective serotonergic reuptake inhibitors (SSRIs) or serotonin and norepinephrine reuptake inhibitors (SNRIs) within 5 days or 5 half-lives (whichever is longer) prior to screening.
14. Consumption of any caffeine and/or xanthine products (i.e., coffee, tea, chocolate and caffeine containing sodas, colas, etc.) within 24 hours prior to entry to the clinical unit on Day -1.
15. Donation of blood, plasma, or other blood products or blood collection in excess of 470 mL within 8 weeks prior to dosing.
16. Known history of sensitivity to any of the study drugs or components thereof, or to other 5-HT3 receptor antagonists, or a history of medication allergy or other allergy that, in the opinion of the PI, contraindicated study participation.
17. Major surgery within 4 weeks of screening that could have interfered with, or for which the treatment might have interfered with, the conduct of the study, or that would have posed an unacceptable risk to the subject in the opinion of the PI.
18. Uncontrolled current illness (i.e., active infection).
19. Had current or a history of cancer, with the exception of basal cell carcinoma.
