Can lorazepam cause drowsiness the next day?
Yes. Lorazepam can cause lingering drowsiness the next day, especially if it was taken at a higher dose, taken later in the day, or combined with other substances that slow the brain (like alcohol or other sedating medications). Patients often experience next-day sleepiness because lorazepam is a benzodiazepine that depresses the central nervous system, which can carry over after the initial dose.
Why might it last into the next day?
Next-day drowsiness can happen due to the drug’s ongoing effects on brain activity after you’ve fallen asleep or after the dose has “worn off.” Timing matters: taking lorazepam in the evening or closer to bedtime can make daytime grogginess more likely. Individual factors—such as age, body sensitivity to sedatives, liver function, and whether the person is already sleep-deprived—can also increase the chance of residual effects.
What else increases the risk of next-day sleepiness?
Next-day drowsiness is more likely when lorazepam is:
- Taken in higher doses than prescribed
- Taken later than usual (closer to morning)
- Combined with other sedatives (for example, opioids, sleep medications, antihistamines like diphenhydramine, or alcohol)
What should you do if you feel groggy the next day?
If the drowsiness affects driving, work safety, or focus, it’s important not to drive or operate machinery until you feel fully alert. If the next-day sleepiness is frequent or severe, talk with the prescriber about adjusting the dose or timing, or considering an alternative.
When to get urgent help
Seek urgent medical help if next-day sleepiness comes with trouble breathing, fainting, confusion that’s out of proportion, inability to stay awake, or if lorazepam was mixed with other depressants (especially opioids or alcohol).
Sources
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