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The mechanism of action by which the Central Nervous System (CNS) is affected is not known. Chloral hydrate is readily absorbed from the gastrointestinal tract following oral administration; however, significant amounts of chloral hydrate have not been detected in the blood after oral administration. It is generally believed that the central depressant effects are due to the principal pharmacologically active metabolite trichloroethanol, which has a plasma half- life of 8 to 10 hours. A portion of the drug is oxidized to trichloroacetic acid (TCA) in the liver and kidneys; TCA is excreted in the urine and bile along with trichloroethanol in free or conjugated form.
Hypnotic dosage produces mild cerebral depression and quiet, deep sleep with little or no ''hangover''; blood pressure and respiration are depressed only slightly more than in normal sleep and reflexes are not significantly depressed, so the patient can be awakened and completely aroused. Chloral hydrate's effect on rapid eye movement (REM) sleep is uncertain. Chloral hydrate has been detected in cerebrospinal fluid and human milk, and it crosses the placental barrier.
Last reviewed on RxList: 12/8/2004
This monograph has been modified to include the generic and brand name in many instances.
Additional Noctec Information
- Noctec Drug Interactions Center: chloral hydrate oral
- Noctec Side Effects Center
- Noctec Overview including Precautions
- Noctec FDA Approved Prescribing Information including Dosage
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You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.
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