What Happens When You Take Ativan and Valium Together
Taking Ativan (lorazepam) and Valium (diazepam) together causes additive central nervous system depression that significantly increases your risk of excessive sedation, respiratory depression, cognitive impairment, falls, and paradoxical agitation. This combination should be avoided in clinical practice.
Primary Risks of Concurrent Use
Both medications are benzodiazepines that work through the same GABA-A receptor mechanism, creating compounding effects rather than complementary ones 1:
- Profound sedation and respiratory depression - The FDA explicitly warns that concomitant benzodiazepine use with other CNS depressants can result in respiratory arrest, coma, and death 1
- Cognitive impairment - Both drugs independently cause memory problems, confusion, and delirium; together these effects multiply 2, 3
- Increased fall risk - Particularly dangerous in older adults, with compounded effects on balance and coordination 4
- Paradoxical reactions - Up to 10% of patients experience agitation, restlessness, or behavioral disinhibition with benzodiazepines; this risk increases with combination use 2, 5
Why This Combination Occurs (and Why It's Problematic)
The only scenario where using both might occur is during cross-tapering when switching from one benzodiazepine to another, but even this should be done cautiously with overlapping doses kept minimal and brief.
There is no therapeutic rationale for prescribing both simultaneously - they have overlapping mechanisms and indications. If one benzodiazepine at an adequate dose is insufficient, the solution is dose adjustment of a single agent or switching to a different medication class, not adding a second benzodiazepine 2.
Specific Pharmacological Concerns
The combination is particularly problematic because:
- Lorazepam has intermediate action (10-20 hour half-life) with no active metabolites, making effects more predictable but potentially more sedating 6
- Diazepam has long action (20-100 hour half-life) with active metabolites that accumulate, creating prolonged effects 6, 7
- Together, you get both immediate sedation from lorazepam AND prolonged accumulation from diazepam's metabolites, creating unpredictable and dangerous levels of CNS depression
Clinical Manifestations to Monitor
If a patient presents having taken both medications 3:
- Excessive drowsiness or inability to arouse - requires immediate medical evaluation
- Respiratory rate <12 breaths/minute - indicates dangerous respiratory depression
- Confusion, disorientation, or delirium - benzodiazepines themselves can cause delirium 3
- Ataxia, unsteady gait - high fall risk requiring supervision
- Paradoxical agitation or disinhibition - may require medication discontinuation
Management Approach
If both medications have been taken:
- Assess respiratory status immediately - monitor oxygen saturation and respiratory rate
- Evaluate level of consciousness - use Richmond Agitation-Sedation Scale or similar
- Provide supportive care - maintain airway, consider supplemental oxygen if needed
- Do NOT abruptly discontinue - both medications together indicate physical dependence risk 1
- Consolidate to single benzodiazepine - typically convert total dose to diazepam equivalents, then taper one medication first
Important Caveats
- Flumazenil (benzodiazepine reversal agent) should be used with extreme caution - can precipitate severe withdrawal including seizures in dependent patients 1
- Abrupt withdrawal is dangerous - can cause seizures, delirium tremens, hallucinations, and rarely death 8, 9, 10
- Older adults are at highest risk - reduced clearance, increased sensitivity, and higher fall risk 4
- Combination with alcohol or opioids is potentially fatal - the CDC guidelines specifically warn about benzodiazepine combinations with other CNS depressants 8, 9
The research evidence shows these medications have different pharmacological profiles 11, 12, 13 but no evidence supports their combined use - only comparative studies exist showing they work through similar mechanisms with different time courses 14, 6, 15, 16, 17.