Benzodiazepines
When a vignette puts you on a benzodiazepine, the question is almost always about when to stop one rather than when to start one. Benzos potentiate GABA-A and produce anxiolysis, sedation, anticonvulsant effect, and muscle relaxation. Short-acting agents (lorazepam, oxazepam, alprazolam) are preferred in liver disease and the elderly when use is unavoidable; long-acting agents (diazepam, chlordiazepoxide) are first-line for alcohol withdrawal protocols. The board reflex is recognizing benzos on the Beers Criteria — falls, fractures, delirium, and cognitive decline in older adults — and avoiding combinations with opioids that drive respiratory-depression mortality. Tapering, not abrupt discontinuation, prevents withdrawal seizures.
📖 Overview
Benzodiazepines (alprazolam, lorazepam, diazepam) are GABA-A receptor positive allosteric modulators. Short-term uses: acute anxiety, panic attacks, alcohol withdrawal (CIWA protocol), status epilepticus, procedural sedation. Not first-line for chronic anxiety because of dependence, tolerance, and withdrawal risks.
⚙️ Mechanism of Action
Bind GABA-A receptor allosteric site → ↑ frequency of chloride channel opening → hyperpolarization → CNS depression.
💎 Board Pearls
- 🚨 OPIOID + BENZO = FDA BLACK BOX (respiratory depression, overdose death).
- 👵 Beers Criteria: AVOID in elderly — falls, fractures, delirium, cognitive impairment.
- 🍺 Alcohol withdrawal: lorazepam preferred (no active metabolites; safer in liver disease).
- 💊 DEA Schedule IV — all require prescription with limits; monitoring via PDMP.
- ⏳ Short-acting (alprazolam) → fastest dependence; use long-acting (diazepam) when taper needed.
- 🧪 Lorazepam = no active metabolites → safe in hepatic impairment.
- 💉 Flumazenil = benzo antidote (use cautiously; can precipitate seizures in chronic users).
- 🤰 Pregnancy: associated with cleft lip/palate (1st trim), floppy infant syndrome (3rd trim).
💊 Drugs in This Class
- Alprazolam — XanaxPanic disorder, acute anxiety (short-term), GAD (off-label).
- Lorazepam — AtivanAcute anxiety, status epilepticus, alcohol withdrawal (CIWA), procedural sedation, chemo-induced N/V.
- Diazepam — ValiumAlcohol withdrawal (long taper), status epilepticus (rectal gel), muscle spasm, anxiety.
Practice Questions
You are reviewing the chart of a 78-year-old female with generalized anxiety disorder, chronic low back pain, and osteoarthritis. Her current medication list includes acetaminophen, lisinopril, atorvastatin, and clonazepam (Klonopin) 0.5 mg twice daily. According to the 2023 AGS Beers Criteria, which of the medication classes on her chart should be AVOIDED in older adults?
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