Phase 1 Study of Oral MG001

Inclusion Criteria: 1. Is a healthy male or female volunteer between 18 and 65 years of age, inclusive, at the time of consent. 2. Has a body mass index (BMI) within the range of 18.0 to 32.0 kg/m2 and a minimum weight of at least 50.0 kg at screening. 3. Has a recent history of oral opioid use , defined as using prescription or recreational oral opioids at least once during the 30-day period preceding screening. 4. Is able to speak English sufficiently to understand the study procedures and provide written informed consent to participate in the study. 5. Has no clinically significant concurrent medical conditions determined by medical history, physical examination, clinical laboratory test , vital signs, and 12-lead ECG. 6. A female study participant must be of non-childbearing potential - should be surgically sterile (i.e., has undergone complete hysterectomy, bilateral oophorectomy, bilateral salpingectomy or tubal ligation/occlusion) or in a menopausal state (at least 1 year without menses), as confirmed by follicle stimulating hormone (FSH) levels (≥40 mIU/mL). If a male study participant that engages in sexual activity that has the risk of pregnancy, must agree to use a double barrier method (e.g., condom and spermicide) and agree to not donate sperm during the study and for at least 90 days after the last dose of the study medication. 7. Is able and willing to comply with protocol requirements and the rules and regulations of the study site and is likely to complete all the study treatments. Exclusion Criteria: 1. Has any clinically significant finding within one year of Screening on medical history, physical examination, complete neurological examination, clinical laboratory test, vital signs (including hemoglobin saturation assessed by pulse oximetry, RR, HR, BP, oral body temperature ), or ECGs that contraindicate participation in the study. This includes but is not limited to history of or current cardiac, hepatic, renal, neurologic, gastrointestinal (GI) , pulmonary, endocrinologic, hematologic, or immunologic disease or history of malignancy. 2. Has clinically significant psychiatric symptoms and/or psychiatric comorbidities (schizophrenia, bipolar disorders, mania, unipolar depression, disruptive behaviors, etc.), or a history of such within one year of screening. Psychiatric assessment will be conducted by a Qualified Mental Health Professional using the Mini-International Neuropsychiatric Interview (MINI). 3. Has a history of suicide attempts or evidence of suicidal ideation based on the Columbia-Suicide Severity Rating Scale (C-SSRS): * Any lifetime history of serious or recurrent suicidal behavior. * Previous history of suicidal behaviors in the past 10 years. * Suicidal ideation with or without a plan (active or passive, respectively) in the past year. 4. Has a history of epilepsy, seizure disorder, or head trauma with neurological sequelae (e.g., loss of consciousness that required hospitalization); current anorexia nervosa or bulimia; or any other conditions that increase seizure risk in the opinion of the study clinician. 5. Has a history of thyroid and/or parathyroid disease or abnormal T4 or PTH levels. 6. Has evidence of second or third degree heart block, atrial fibrillation, atrial flutter, prolongation of the QTc, or any other finding on the screening ECG that, in the opinion of the study medical clinician, would preclude safe participation in the study. 7. Has any clinically significant abnormal laboratory values 8. Has taken kratom or any investigational drug in another study within 30 days of study consent. 9. Requires treatment with opioid-containing medications (e.g., opioid analgesics) during the study period. 10. Has used opioids intravenously or on 3 or more consecutive days during the 30 day period preceding screening. 11. Has a sitting systolic blood pressure (SBP) \>140 mmHg, diastolic BP (DBP) \>90 mmHg or HR \<50 or \>100 beats per minute (BPM) at screening and clinic intake. 12. Has orthostatic hypotension, defined as a 20 mmHg reduction in SBP and 10 mmHg in DBP. 13. Has an O2 saturation, defined as the percentage of hemoglobin in the blood that is carrying oxygen, below 95% from a 10 second reading. 14. Has donated blood (excluding plasma donation) of approximately 500 mL within 56 days prior to screening. 15. Has donated plasma within 7 days prior to screening. 16. Has taken any concomitant medications, including prescription, over-the-counter, dietary supplements, herbal products, vitamins, or medications interacting with CYP3A4, CYP2D6, or CYP1A2 within 14 days or 5-half-lives (whichever is longer) prior to study drug administration, and throughout the study.