REDWOOD TOXICOLOGY LABORATORY

ETHANOL DRUG INFORMATION

Classification

Ethanol is a central nervous system depressant that exhibits a variety of sedating effects when consumed in large amounts.

Metabolism

Ethanol is a small molecule which is readily soluble in water and penetrates membranes throughout the gastrointestinal (GI) tract, including the mouth, stomach and small intestine. The rate of absorption varies greatly due to factors such as type of beverage ingested, quantity of food in the stomach, frequency of gastric emptying, drinking pattern, etc. The average time to peak absorption is usually 30 to 60 minutes, but may range from 15 minutes to 3 hours. Approximately 95% of an ingested dose of ethanol is metabolized by liver enzymes, principally alcohol dehydrogenase, with the remainder eliminated unchanged in the urine, breath, sweat, and feces. Ethanol is metabolized to acetaldehyde and then to a final end product of acetic acid. Distribution of alcohol throughout the body occurs via the blood supply and since ethanol is hydrophilic (strong affinity for water), it will diffuse into body tissue or fluid compartments such as urine, saliva, plasma, etc. Since plasma or serum has a higher percentage of water by unit volume, it will have a higher ethanol concentration than whole blood. A wide range of elimination rates exist, however, ethanol is typically metabolized at approximately .015-.018 gm/dL per hour in healthy individuals. Therefore, the detection time of ethanol in body fluids is dose dependent.

Abuse

Ethanol is the most widely consumed drug in society and is generally consumed socially. Ethanol is predominantly consumed as fermented or distilled beverages and is also a component of mouthwashes, medicinal, and industrial products. Fermented beverages such as beers and ales contain 3-9% ethanol by volume, wines contain 10-18%, and distilled spirits contain 20-60% ethanol. Acute ingestion of ethanol typically leads to progressive stages of effects depending upon the amount consumed. With low to moderate consumption a person may initially experience mild euphoria, sociability, decreased inhibitions and slight sensory-motor impairment. With increased consumption the effects may progress to emotional instability, loss of perception, memory, and comprehension, in addition to decreased response time and slurred speech, staggered gait and loss of muscular coordination. Finally, excessive acute ethanol consumption can lead to impaired consciousness, respiratory depression, coma and death. Chronic ethanol abuse can result in multi-organ pathological effects. These include cirrhosis of the liver, acute and chronic gastritis, pancreatitis, cardiomyopathy and various neurological and metabolic disorders.

Methods of Analysis

One of the most widely used screening techniques for ethanol in urine includes enzyme assay utilizing alcohol dehydrogenase. Gas chromatographic methods, either direct injection or headspace sampling, with the incorporation of an internal standard offer very accurate and precise quantitation of ethanol.


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Drug information data is not definitive and should be used for reference guidelines only.

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