Intervention: O-Demethyltramadol
Trial phase: Phase 1
SMILES: CN(C)CC1CCCCC1(O)c1cccc(O)c1
Sex: All
Age groups: Adult
Healthy volunteers: Accepts Healthy Volunteers
Participants at risk: 23
Group description: While fasting a single oral dose of 20 mg desmetramadol.

Desmetramadol: Analgesic
Eligibility criteria:
Inclusion Criteria:

Healthy males and females with vital signs as follows at screening: systolic blood pressure > 90 mm Hg and < 140 mm Hg; diastolic blood pressure > 40 mm Hg and < 90 mm Hg; pulse 40 to 99 beats per minute; respiratory rate 12 to 24 breathes per minute.
Age 19 to 55 years.
Able and willing to give informed consent
Able to comply with all study procedures.

If female, must not be of childbearing potential or must agree to use one or more of the following forms of contraception from screening, throughout the study and for 30 days following study drug administration: hormonal (e.g., oral, transdermal, intravaginal, implant or injection for 3 months); double barrier (e.g., condom or diaphragm with spermicide); intrauterine device (IUD) or system (IUS) (for 3 months); vasectomized partner (6 months minimum); or abstinence.

Screening laboratory results must be within normal range per clinical research unit: serum sodium, potassium, calcium, BUN, creatinine, ALT, AST, total bilirubin, alkaline phosphatase, glucose (random), albumin, total protein, WBC and differential, hemoglobin, and platelets. In addition PT and PTT must be < 1.2 ULN.

Electrocardiogram (ECG) without clinically significant abnormalities.

Urinalysis demonstrating < +1 glucose, and +1 protein.

If female, must have a negative pregnancy test at screening
Negative urine test for substances of abuse, including opiates, per clinical pharmacology unit standards at screening and clinic check-in.
Negative serology tests for HIV, hepatitis B surface antigen, and hepatitis C virus antibody.
Weight > 50 Kg and a body mass index (BMI) of 18.0 to 32.0 kg/m (inclusive).
Non-smoker of tobacco for a minimum of the past 3 months, and negative urine continine test.

Exclusion Criteria:

Oral temperature > 38°C or current illness.
History of seizures, epilepsy, or recognized increase risk of seizure (e.g., head trauma, metabolic disorders, alcohol or drug withdrawal).
History of cirrhosis or laboratory evidence of liver disease.
Having undergone gall bladder removal.
Use of alcohol within 24 hours of day -1 until the end of the study; and grapefruit, grapefruit-related citrus fruits (e.g., Seville oranges, pomelos), or grapefruit juice or grapefruit-related juices within 7 days of study drug administration and until the end of the study.
History of previous anaphylaxis, severe allergic reaction to tramadol, codeine, or other opioid drugs.
Any other unstable acute or chronic disease that could interfere with the evaluation of the safety of the study drug as determined by the principal Investigator in dialogue with the Sponsor Medical Monitor.
Females must not be currently pregnant or breast feeding.
Unlikely to comply with the study protocol.
Known or suspected alcohol or drug abuse within the past 6 months.
Received another investigational agent within 4 weeks of Day -1, or within five half-lives of Day -1, whichever is longer; or receiving any other investigational agent during this study.
Any concurrent disease or condition that in the opinion of the investigator impairs the subject's ability to complete the trial. Psychological, familial, sociological, geographical or medical conditions which, in the Investigator's opinion, could compromise compliance with the objectives and procedures of this protocol, or obscure interpretation of the trial data.