Acamprosate to Reduce Symptoms of Alcohol Withdrawal

* INCLUSION CRITERIA - PATIENTS: 1. Alcohol dependence according to DSM-IV, based on the alcohol dependence module of the SCID I-interview, and alcohol withdrawal, based on either of: Clinically manifest significant alcohol withdrawal symptoms, with or without detectable blood alcohol concentrations. In absence of the above, current intoxication above 0.1 g/dl BAC, self-reported history of continuous alcohol use \> 1 month, and self-reported previous episodes of significantly distressful alcohol withdrawal symptoms, whether treated or not. 2. Age 21 - 65; in younger subjects, maturation processes of the central nervous system are still ongoing; while in older subjects, degenerative changes may confound the measures studied. 3. Smoking status: this will be noted and evaluated using the Fagerstrom inventory, so that its potential contribution to group differences can be assessed. This variable will not otherwise affect inclusion / exclusion. INCLUSION CRITERIA - HEALTHY CONTROLS: Subjects will be eligible for inclusion if they are aged 21-65. They will be as closely as possible matched to the patient population with regard to gender and age. EXCLUSION CRITERIA - PATIENTS: 1. Current or prior history of any disease, including cardiovascular, respiratory, gastrointestinal, hepatic, renal, endocrine, or reproductive disorders, or a positive hepatitis or HIV test at screening. 2. Current Axis-I psychiatric illness. 3. Current or prior history of any alcohol or drug dependence, as well as non-drinkers (alcohol-naive individuals or current abstainers). 4. Positive result on urine screen for illicit drugs. 5. Nursing, pregnancy or intention to become pregnant for women. Female participants will undergo a urine beta-hCG test to ensure they are not pregnant. 6. Pregnancy (negative test required) or ongoing breastfeeding. 7. Use of prescription or OTC medications know to interact with alcohol within 2 weeks of the study. These include, but may not be limited to: isosorbide, nitroglycerine, benzodiazepines, warfarin, anti-depressants such as amitriptyline, clomipramine and nefazodone, anti-diabetes medications such as glyburide, metformin and tolbutamide, H2-antagonists for heartburn such as cimetidine and ranitidine, muscle relaxants, anti-epileptics including phenytoin and Phenobarbital codeine, and narcotics including darvocet, percocet and hydrocodone. Drugs known to inhibit or induce enzymes that metabolize alcohol should not be used for 4 weeks prior to the study. These include chlorzoxazone, isoniazid, metronidazole and disulfiram. Cough-and-cold preparations which contain anti-histamines, pain medicines and anti-inflammatories such as aspirin, ibuprofen, acetaminophen, celecoxib and naproxen, should be withheld for at least a 72 hours prior to each study session. 8. Self-reported history of flushing upon intake of alcohol. 9. Inability to undergo an MR scan, due to presence of ferromagnetic objects in their bodies which could cause adverse effects in the MRI scanner, pronounced anxiety provoked by enclosed spaces, or other reasons. EXCLUSION CRITERIA - HEALTHY CONTROLS: 1. History of any substance use disorder. 2. Average weekly consumption over last 4 weeks, assessed with Time-Line Follow-Back, exceeding 210g pure alcohol / week, or consumption of more than 60g pure alcohol on any single occasion within last 3 days 3. Any history of a psychotic disorder or a history of any other psychiatric diagnosis within the last 12 months 4. Any prescription medication within the last 2 months 5. Pregnant (negative pregnancy test required) or breastfeeding 6. Inability to undergo an MR scan, due to presence of ferromagnetic objects in their bodies which could cause adverse effects in the MRI scanner, pronounced anxiety provoked by enclosed spaces, or other reason