Lorazepam: what it treats, how to take it, side effects
Last updated September 3, 2026.
Lorazepam is a benzodiazepine that slows brain activity to relieve anxiety and allow sleep. You may know it as Ativan. It works fast and works well, which is exactly why it is a controlled substance: habit-forming, dangerous to stop suddenly, and dangerous mixed with opioids or alcohol. This page is information only - prescriptions for controlled substances always come from your own prescriber.
What does it treat?
Anxiety and insomnia. It works by slowing activity in the brain to allow for relaxation - which is why the same drug covers both a racing mind at noon and a sleepless one at midnight.
How do you take it?
Exactly as prescribed. The tablets and liquid concentrate are taken two or three times a day, with or without food; for insomnia, at bedtime; the extended-release capsule is once a day in the morning. The label's usual range is 2 to 6 mg a day in divided doses, with the largest dose before bedtime (anywhere from 1 to 10 mg a day depending on the patient); older or debilitated patients start at 1 to 2 mg a day. Never take more, more often, or longer than prescribed. Never stop suddenly: withdrawal can bring unusual movements, ringing in the ears, anxiety, memory and concentration problems, insomnia, seizures, shaking, muscle twitching, mental health changes, aggression, depression, burning or prickling in the limbs, hallucinations, and thoughts of harming yourself - your doctor tapers gradually. Missed dose: take it when you remember unless the next one is close; never double up.
Side effects to know
- Common: drowsiness, dizziness, weakness, and unsteadiness.
- Serious: allergic reactions (rash, hives, itching, swelling of the face, eyes, or mouth, wheezing, shortness of breath) and yellowing of the skin or eyes. The boxed warnings: combined with opioids, cough or pain medications, or alcohol, lorazepam can cause life-threatening breathing problems, extreme sleepiness, or coma; and it is habit-forming even at prescribed doses.
Who should not take it?
Anyone combining it with opioids, heavy alcohol use, or street drugs. Tell your prescriber about all cough and pain medications, any history of heavy drinking or drug use, depression or other mental illness, and flag liver or kidney disease, breathing problems, and glaucoma. It causes drowsiness and unsteadiness - no driving until you know it, and extra care against falls if you are older. Pregnancy and breastfeeding need a direct conversation with your prescriber. Never let anyone else take it: controlled substance, limited refills, sharing is dangerous and illegal.
When is it an emergency?
Slowed or difficult breathing, extreme sleepiness, unresponsiveness, or someone who cannot be awakened is a 911 call. Wheezing, shortness of breath, and facial swelling mean the same. Thoughts of harming or killing yourself - including during withdrawal - mean calling your doctor right away, or call or text 988, the Suicide and Crisis Lifeline, any time. For an overdose (extreme drowsiness, confusion, slowed breathing and heartbeat, loss of consciousness), call Poison Control at 1-800-222-1222. Pymander's escalation routing is built and tested specifically for this class of decision; see the safety architecture working paper.
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Common questions
Is lorazepam addictive?
It can be. MedlinePlus says lorazepam may be habit forming, and the label warns of abuse, misuse, and addiction even at recommended doses - do not take more, more often, or longer than prescribed. The risk climbs with dose, duration, and any history of heavy alcohol or drug use, which your prescriber needs to know about.
Why can't I stop lorazepam suddenly?
Withdrawal can be dangerous: MedlinePlus lists seizures, shaking, muscle twitching, anxiety, insomnia, memory and concentration problems, ringing in the ears, hallucinations, aggression, depression, and thoughts of harming yourself. Your doctor will probably decrease your dose gradually - stopping cold after regular use can trigger seizures even in people who never had one.
Can I drink alcohol while taking lorazepam?
No. The boxed warning covers combinations that slow breathing, and alcohol tops the list - with lorazepam it risks life-threatening breathing problems, extreme sleepiness, and coma. On a benzodiazepine, alcohol is off the table entirely.
How fast does lorazepam work for anxiety?
It is one of the faster benzodiazepines - most people feel the calming effect within the hour of a dose. That speed is useful and also part of why dependence develops: the relief is immediate and repeatable. It is designed for short courses and specific situations, not open-ended daily life, unless your prescriber says otherwise.
What is the difference between Ativan tablets and Loreev XR?
Same lorazepam, different clock. The tablets and liquid are taken two or three times a day; the extended-release capsule (Loreev XR) is once a day in the morning for people who need all-day coverage. Your prescriber picks based on whether your anxiety is episodic or constant.
What happens if I miss a dose of lorazepam?
Take it as soon as you remember, unless it is almost time for the next one - then skip it and never double up. Doubling a benzodiazepine dose means stacking sedation, and on this class that is how people end up too drowsy to function safely.