Lorazepam

The primary CNS effect. Dose-dependent. Impairs driving, psychomotor performance, and cognitive function. Tolerance to sedation develops with regular use, but impairment may persist even when the patient no longer feels sedated.

Benzodiazepines impair memory encoding (anterograde amnesia), attention, and processing speed. Long-term use is associated with cognitive decline, particularly in older adults. Whether this is fully reversible after discontinuation is debated.

Benzodiazepines alone rarely cause fatal respiratory depression in healthy adults (ceiling effect from allosteric modulation). In combination with opioids, alcohol, or other CNS depressants, respiratory depression risk increases dramatically. The FDA boxed warning on combined benzodiazepine-opioid use reflects real mortality data.

The defining risk. Physiological dependence often develops within weeks of daily dosing; risk rises with dose and duration of use. Withdrawal ranges from rebound anxiety and insomnia (mild) to tremor, autonomic instability, seizures, and death (severe). Risk correlates with dose, duration of use, and speed of discontinuation.

Particularly in elderly. CNS depression impairs balance and coordination. Benzodiazepines are a leading contributor to falls in older adults. This is one of the primary reasons they are on the Beers Criteria list.

Some patients, particularly elderly and those with neurological or developmental conditions, become more agitated, disinhibited, or aggressive after benzodiazepines. Recognizing this pattern prevents the error of increasing the dose (which worsens the paradoxical reaction).

Similar to alcohol-related disinhibition. Patients may say or do things they would not normally do. This is distinct from paradoxical agitation and is more commonly seen at higher doses.

Pharmacological inevitability with regular use. The same dose produces diminishing effect. This drives dose escalation in patients using benzodiazepines chronically. Tolerance to the sedative and anticonvulsant effects develops faster than tolerance to the anxiolytic effects.