Oxazepam (Serax)

Class

Short- to intermediate-acting benzodiazepine

Mechanism

Enhances GABA-A receptor activity, increasing inhibitory neurotransmission to reduce anxiety and agitation.

FDA-Approved Use

Anxiety disorders, acute alcohol withdrawal.

Off-Label Use

Benzodiazepine tapering, agitation in medically complex or elderly patients.

Formulation

Oral capsules and tablets.

Titration

Usually 10 mg p.o. three times daily, titrated based on symptom severity and tolerance.

Dose Range

10–30 mg p.o. TID.

Kinetics

Metabolized via hepatic glucuronidation (phase II), bypassing CYP450 system, resulting in safer use in hepatic impairment. Half-life ranges 4–15 hours with no active metabolites.

Common AEs

Sedation, dizziness, impaired motor coordination.

Serious/Rare AEs

Respiratory depression (especially with other CNS depressants), paradoxical reactions (rare).

Monitoring

Monitor sedation, cognition, respiratory status, and fall risk, especially in elderly.

Black Box Warning

Risk of concomitant opioid use increasing respiratory depression and death; caution advised.

Considerations

Preferred in elderly, patients with hepatic dysfunction, traumatic brain injury (TBI), or cognitive impairment due to safer metabolism and lower accumulation risk. However, use cautiously in elderly due to increased risk of sedation and falls. Effective option for alcohol withdrawal and benzodiazepine tapering.