Tramadol to Improve Its Detection in Biological Matrices in Anti-doping Controls

Inclusion Criteria: * Age ≥ 18 and ≤ 55 years. * Weight ≥ 50 kg and ≤ 100 kg. * Body mass index (BMI) ≥ 18 and ≤ 30. * Negative serum pregnancy test (women only). * Signed informed consent prior to any study-mandated procedure. Exclusion Criteria: * Smoker of more than 5 cigarettes per day in the last 3 months prior to participate in the study. * History of psychiatric disorders, alcoholism or drug abuse. * Positive urine pregnancy test. * No highly effective anticonception measures during the trial. * Breastfeeding. * Positive blood or urine test for drugs of abuse or alcohol breath test prior to study drug administration. * Any clinically relevant disease or condition (cardiovascular, renal, hepatic, endocrine, hematology, neurology o other acute or chronic diseases) that in the judgment of the investigator might interfere with the subject's ability to comply with study procedures or requirements and/or bias the interpretation of the study results and/or jeopardize the subject's safety. * Major Surgery last 6 months. * Ongoing gastrointestinal diseases or history of gastrointestinal surgery affecting absorption. * Subjects with a clinically significant disease within one month prior to study drug administration. * Any clinically relevant findings in physical examination, vital signs, 12-lead ECG and safety laboratory parameters. * Positive hepatitis or HIV test. * Known hypersensitivity to any drug or drug excipients. * Use of drugs known to induce or inhibit hepatic drug metabolism within one month prior to study administration or during the study and use of citrus juice during the study. * Any prescription or over-the-counter (OTC) product including herbal, homeopathic, vitamins, minerals and nutritional supplements within 2 weeks prior to study drug administration. * Intake of more than 5 units per day of beverages containing xanthine (coffee, tea or cola drinks). * Donation of blood or plasma within one month prior to study drug administration or transfusion of blood or plasma for medical/surgical reasons or intention to donate blood or plasma within one month after study drug administration. * History of inadequate venous access and/or experience of difficulty donating blood. * Not able/not willing to accept restrictions regarding diet, physical exercise, and consumption of alcohol and/or xanthine containing items when out of CRU. * Subject included in a clinical study within 3 months prior to study drug administration.