Related Experiment Video
Updated: Aug 10, 2026

10:52
A Novel Method of Drug Administration to Multiple Zebrafish (Danio rerio) and the Quantification of Withdrawal
Published on: November 12, 2014
Drowning due to cyclobenzaprine and ethanol
Forensic Science International
|June 5, 1999
Summary
A 35-year-old female died from a fatal combination of high blood alcohol and cyclobenzaprine (Flexeril) levels. Autopsy results were unremarkable, with toxicology confirming the lethal drug and ethanol concentrations.
Area of Science:
- Forensic Toxicology
- Clinical Toxicology
- Pharmacology
Background:
- Investigating the toxicological profile of drug interactions in post-mortem cases.
- Understanding the lethal potential of combined ethanol and cyclobenzaprine (Flexeril) ingestion.
- Evaluating the significance of unremarkable autopsy findings in suspected overdose fatalities.
Observation:
- A 35-year-old female was discovered deceased in a bathtub with her head submerged.
- Autopsy examination revealed no significant pathological findings.
- Toxicological analysis detected elevated levels of ethanol (215 mg/dL) and cyclobenzaprine (1.786 mg/L) in blood samples.
Findings:
- The combined presence of high blood alcohol and cyclobenzaprine concentrations was determined to be the cause of death.
- Cyclobenzaprine, a muscle relaxant, at 1.786 mg/L, proved fatal in conjunction with ethanol.
- The synergistic effect of ethanol and cyclobenzaprine led to a fatal outcome.
Implications:
- Highlights the critical role of comprehensive toxicological screening in unexplained deaths.
- Underscores the dangers of combining alcohol with prescription muscle relaxants like cyclobenzaprine.
- Emphasizes the need for patient education regarding the risks associated with polydrug use and central nervous system depressants.
Related Concept Videos
CNS Depressants: Alcohol and Nicotine
Ethanol, a clear colorless alcohol, has been consumed by humans for millennia, but its effects on the body are far from benign. At lower doses, it induces decreased inhibitions and loquaciousness, leading to its social appeal. However, it can cause severe consequences at higher doses, such as coma and respiratory depression, due to its zero-order elimination kinetics. Chronic ethanol abuse wreaks havoc on multiple organ systems, particularly the CNS and the liver. Abrupt cessation of ethanol...
CNS Depressants: Barbiturates and Benzodiazepines
CNS depressants include drugs from the category of barbiturates and benzodiazepines. They are valuable medications for managing anxiety disorders and insomnia. Barbiturates, once used to induce and maintain sleep, have been replaced mainly by benzodiazepines due to barbiturate's toxicity, tolerance, and overdose risks. They interact with GABAA receptors, leading to sedation at low doses and potentially coma and death at higher doses. Phenobarbital, a long-acting barbiturate, possesses...
Sedatives and Hypnotics Drugs: Benzodiazepines
Benzodiazepines have both sedative and hypnotic properties. They include compounds such as diazepam (Valium) and alprazolam (Xanax). Structurally, their cores are similar, consisting of the fusion of a benzene ring and a diazepine ring, but they share a common mechanism of action in the central nervous system (CNS).
Benzodiazepines work by enhancing the effects of the inhibitory neurotransmitter GABA. They bind to the GABAA receptor, increasing its affinity for GABA, which opens chloride...
Benzodiazepines work by enhancing the effects of the inhibitory neurotransmitter GABA. They bind to the GABAA receptor, increasing its affinity for GABA, which opens chloride...
Drug toxicity: Drug–Drug Interaction
Drug–drug interactions can precipitate toxicity through multiple mechanisms. Absorption interactions alter how drugs enter the body, exemplified when ranitidine increases the absorption of basic drugs, while cholestyramine decreases the levels of propranolol. Protein binding interactions occur when drugs share the same binding sites on plasma proteins. Drugs like aspirin and warfarin, when bound in excess, can lead to increased free drug concentrations, enhancing the potential for...
Toxidromes: Clinical Features
Toxidromes are specific patterns of symptoms resulting from toxic substance exposure. They help in the identification and treatment of poisoning. The symptoms of each toxidrome group indicate poisoning by a certain class of chemicals or drugs.1. Sympathomimetic: Stimulates the sympathetic nervous system. Symptoms include agitation, increased heart rate (HR), blood pressure (BP), respiratory rate (RR), temperature, and pupil size. Drugs like cocaine and amphetamines, along with tremors and...
Depressants
Depressant drugs, including alcohol and sedative-hypnotics, diminish central nervous system activity by enhancing the action of gamma-aminobutyric acid (GABA), a neurotransmitter that reduces brain activity and promotes relaxation. These substances can have various therapeutic uses but also pose significant risks, especially when misused or combined.
Alcohol is a common depressant that can induce a sense of relaxation and reduced inhibition at low doses. Contrary to its occasional...
Alcohol is a common depressant that can induce a sense of relaxation and reduced inhibition at low doses. Contrary to its occasional...

