This is a single-center, double-blind, placebo-controlled, Phase 1a single ascending dose study evaluating the safety, tolerability and pharmacokinetics of sequential doses of oral EC5026 in healthy male and female subjects. EC5026 is an inhibitor of the soluble Epoxide Hydrolase (sEH) enzyme developed as a first-in-class analgesic for the treatment of pain. This study will help refine the dosing strategy for subsequent multiple-dose studies in healthy subjects and for future clinical trials in patients with neuropathic pain. sEH is an enzyme that is downstream in the cytochrome P450 (CYP) pathway of the arachidonic acid (AA) cascade. The sEH enzyme is responsible of metabolizing a class of epoxy-fatty acids known as epoxyeicosatrienoic acids (EETs), which are potent, naturally occurring analgesics. EETs are produced at high concentrations in areas of tissue damage and inflammation, but are rapidly metabolized by the sEH enzyme into inactive compounds. Effective inhibition of sEH activity prolongs the ability of EETs to exert their analgesic activity.
Inclusion Criteria: Each subject must meet all of the following criteria to be enrolled in this study: 1. The subject is male of female 18 to 65 years, inclusive 2. The subject is able and willing to provide written informed consent to participate in the study. 3. The subject is considered by the investigator to be in good general health as determined by prestudy medical history, physical examination findings, clinical laboratory test results, and 12-lead electrocardiogram (ECG) results. 4. The subject is willing and able to remain in confinement at the study unit from Day -1 to Day 5 and return to the unit at Days 7 and 14 for additional blood tests and safety evaluations. 5. The subject has a body mass index of 19.0 to 32.0 kg/m2, inclusive, at Screening. 6. The subject has normal blood pressure (systolic blood pressure 90 to 140 mm Hg, diastolic blood pressure 50 to 90 mm Hg), and heart rate (resting heart rate 45 to 90 beats per minute) without medication. 7. The subject has a clinical chemistry profile including electrolytes, alkaline phosphatase (ALP), lactate dehydrogenase, creatine phosphokinase (CPK), creatinine, and urea within the normal range without medication at Screening. 8. The subject has urinalysis results including urinary creatinine within the normal range. 9. The subject is a nonsmoker or is willing to abstain from smoking starting 2 weeks prior to randomization and for the duration of the study. 10. The subject is able to read, understand, and follow the study instructions. 11. Male subjects and their female partners must agree to use double-barrier contraception during the study and for 2 months after receiving the last dose of study drug or provide proof of postmenopausal state (minimum 1 year) or surgical sterility. 12. Male subjects must not donate sperm during the study and for 12 months after receiving the last dose of study drug. 13. Female subjects must be nonpregnant, nonlactating, and either postmenopausal for at least 1 year, or surgically sterile for at least 3 months, or agrees to use double barrier contraception from 28 days prior to randomization and/or their last confirmed menstrual period prior to study randomization (whichever is longer) until 2 months after discharge from the clinic. Female subjects will refrain from using hormonal contraceptives for at least 28 days prior to study entry until the end of study (EOS) visit (Day 14). All female subjects of childbearing potential must have a negative pregnancy test result at Screening and baseline (Day -1). Exclusion Criteria: Subjects meeting any of the following criteria will be excluded from the study: 1. The subject has any abnormalities in any of the following: liver function tests, CPK, or urinalysis results. Liver function tests, CPK, or urinalysis tests may be repeated at the discretion of the investigator, if necessary, to confirm any abnormalities. 2. The subject has used any nonstudy medication(s), including low-dose aspirin for cardiovascular prophylaxis, within 1 week before administration of study drug. 3. The subject has used chemotherapy agents or has a history of cancer, other than nonmetastatic skin cancer that has been completely excised, within 5 years prior to screening. 4. The subject has a history of bacterial, fungal, or viral infection requiring treatment with antibiotics, antifungal agents, or antivirals within 1 month prior to randomization. 5. The subject has a presence or history of peripheral edema within the past 5 years. 6. The subject has a history of congestive heart failure. 7. The subject has used drugs which are CYP inducers or inhibitors within 30 days of randomization (eg, cimetidine, paroxetine, fluoxetine, haloperidol, ketoconazole, itraconazole, fluconazole, erythromycin, clarithromycin). 8. The subject has used any dietary aids, supplements, or foods that are known to modulate drug metabolizing enzymes (eg, St. John's wort, grapefruit juice) within 14 days of administration of study drug. 9. The subject has difficulty in swallowing oral medications. 10. The subject has a history of seizure disorder. 11. The subject has serious psychosocial comorbidities as determined by the principal investigator. 12. The subject has cognitive or psychiatric disorders, or any other condition that could interfere with compliance with study procedures and/or confinement in a study unit for 5.5 days. 13. The subject has a history of drug or alcohol abuse within 1 year prior to Screening. 14. The subject has used any other investigational drug within 1 month or 5 half-lives, whichever is longer, prior to randomization. 15. The subject has used prescription drugs within 1 month or 5 half-lives, whichever is longer, prior to randomization. 16. The subject has used over-the-counter medication excluding routine vitamins, but including mega-dose vitamin therapy, within 1 week prior to randomization. 17. The subject has donated and/or received any blood or blood products (more than 450 mL) within 3 months prior to randomization. 18. The subject has a presence or history of active gastrointestinal, renal, hepatic, or coagulant disorder within 1 month prior to randomization. 19. The subject has a presence or history of esophageal or gastroduodenal ulceration within 1 month prior to randomization. 20. The subject has a family history of significant cardiac disease (ie, sudden death in first degree relative; myocardial infarction prior to 50 years