Interaction of Alcohol With Energy Drinks

Inclusion Criteria: * Understand and accept the study's procedures and sign an informed consent form * No evidence of somatic or psychiatric disorders as per past medical history and physical examination * EKG, blood and urine tests taken before entry into the study within the normal range. Minor and transient abnormalities may be acceptable if, according to the Principal Investigator's criterion and the state of the art, they are felt to have no clinical relevance, entail no danger to the participant, and don't interfere with the product's assessment. These abnormalities and their non-relevance must be specifically justified in writing) * Body mass index (BMI=weight/heigth2) between 19 and 27 kg/m2, weight between 50 and 100 kg * For premenopausal females, a regular menstrual cycle of 26-32 days duration. * Social or recreational alcohol consumption of at least 1 unit per day (or its equivalent \[7 units\] over the whole week) and having experienced drunkenness several times * Regular consumption of beverages containing methylxanthines (at least 5 per week) * Consumption of energy drinks several times previously * Having a driving license Exclusion Criteria: * Evidence of a preexisting condition (including gastrointestinal, liver, or kidney disorders) that may alter the absorption, distribution, metabolism or excretion of the drug or symptoms suggestive of drug-induced gastrointestinal irritation * Previous psychiatric disorders, alcoholism, abuse of prescription drugs or…