Ativan Side Effects, From the First Dose to Long Term Use

Lorazepam side effects start with the ones everyone gets, drowsiness, dizziness, and a heavy, slowed down feeling, and end with the ones nobody expects, physical dependence within weeks and withdrawal symptoms that can include seizures. Lorazepam, sold under the brand name Ativan, is one of the most prescribed benzodiazepines in the country. It works well for short term relief of anxiety. It was never designed for years of daily use, and most of its side effects come from being taken that way.

What Are the Most Common Lorazepam Side Effects?

The most common ones are drowsiness, dizziness, weakness, and unsteadiness. They show up at any dose, including 0.5 mg, and hit hardest in the first week.

• Drowsiness and sedation, sometimes to the point of extreme tiredness.
• Dizziness and unsteadiness, which cause falls.
• Muscle weakness. Unusual muscle weakness that does not ease should be reported to a doctor.
• Difficulty concentrating and slowed thinking.
• Blurred vision.
• Headache, nausea, and constipation.
• Memory gaps for the hours after a dose.

Common side effects occur in more than 1 in 100 people. Several factors decide how hard the side effects hit, including age, dose, liver function, body weight, and other substances or drugs on board. Elderly patients are at higher risk of sedation and confusion and are usually started on half the standard dose.

How Lorazepam, Brand Name Ativan, Works

Lorazepam is a benzodiazepine and a CNS depressant. It boosts gamma aminobutyric acid, or GABA, the neurotransmitter that quiets the central nervous system. More GABA means less firing in the circuits that produce anxiety, muscle tension, and wakefulness. The calming effects of lorazepam arrive within 20 to 30 minutes of a tablet and last six to eight hours.

That mechanism is why lorazepam works so well and why its side effects look the way they do. Everything it does to anxiety it also does to alertness, coordination, memory, and breathing, like all drugs that slow the nervous system.

Lorazepam is legally prescribed to treat anxiety disorders, including generalized anxiety disorder and panic attacks, and hospitals use it for seizures, sedation before procedures, and severe agitation during alcohol withdrawal. It comes as lorazepam tablets, a liquid, an injection, and extended release capsules. The medication guide that comes with every prescription lists interactions with other medications most people never hear about at the pharmacy.

Does Lorazepam Make You Sleepy?

Yes. Sleepiness is the most common of all Ativan side effects and the reason it is sometimes prescribed off label for insomnia. Will 0.5 mg of lorazepam make you sleepy? For anyone new to taking lorazepam, yes, noticeably. A 0.5 mg dose lasts six to eight hours.

Lorazepam is a poor sleeping pill. The effects of lorazepam on sleep are mixed. It shortens the time it takes to fall asleep but suppresses deep sleep, tolerance develops within a couple of weeks, and stopping it produces rebound insomnia worse than the original sleep problems.

Serious Side Effects of Ativan

Serious side effects are rare at prescribed doses taken alone. They become common at higher doses or when lorazepam is mixed with other CNS depressants, including street drugs.

• Respiratory depression. Slow, shallow, or difficult breathing. On its own, lorazepam rarely causes breathing problems in healthy adults. Combined with opioids, alcohol, or other sedatives, respiratory depression is the leading cause of benzodiazepine overdose deaths, and the FDA boxed warning exists because of it.
• Paradoxical reactions. Some people, especially children and older adults, get the opposite of calming effects. Severe agitation, aggression, and rage.
• Allergic reactions. Rash, hives, swelling of the face or throat, and wheezing. Allergic reactions to lorazepam are uncommon but can be life threatening.
• Memory loss. Anterograde amnesia, where the person cannot form new memories for hours after a dose, is worse with alcohol.
• Depression and suicidal thoughts, particularly in people with a history of mental disorders or other mental health conditions.
• Yellowing of the skin or eyes, a sign of liver trouble.

Overdose with an opioid or alcohol means CNS depression deep enough to stop breathing. The Centers for Disease Control and Prevention advises clinicians to avoid prescribing opioids and benzodiazepines together for that reason.

Ativan Side Effects in Females

Women are prescribed benzodiazepines at roughly twice the rate of men, and a few side effects land differently.

• Pregnancy. Lorazepam crosses the placenta. Use late in pregnancy can cause sedation, breathing problems, and feeding problems in the newborn, and babies can be born with withdrawal symptoms.
• Breastfeeding. Small amounts pass into milk, so infants need monitoring for sleepiness.
• Older women. Women live longer and are prescribed lorazepam longer, so more of the cognitive decline and fall risk of long term use lands on women over 65.
• Body weight. Women on average have less lean mass, so the same dose produces a higher blood level and stronger sedation.Long Term Effects of Lorazepam

Lorazepam long term use is where the real damage happens, and long term means taking lorazepam for more than about four weeks. The American Family Physician review of benzodiazepine use disorder found no evidence supporting use beyond one month, and a long list of harms that begin around then.

• Tolerance. The dose that worked in week one does less by week four. People take more, and the anxiety symptoms it was meant to treat come back stronger between doses.
• Physical dependence. The FDA states that physical dependence can develop within days to weeks of steady use, even at prescribed doses, and faster at higher doses.
• Cognitive decline. Long term users show deficits in memory, attention, and processing speed, and some of it persists for years after stopping.
• Falls and fractures. Older users of these drugs have a 20 to 40 percent higher risk of hip fracture.
• Dementia. Studies show an association between long term benzodiazepine use and dementia, though causation is still debated.
• Depression and emotional blunting, symptoms that lift slowly.
• Benzodiazepine dependence that shades into misuse. Lorazepam is habit forming and highly addictive in people prone to it, and a prescription medication started for panic can end as a substance use disorder under the Diagnostic and Statistical Manual criteria, the same as with other benzodiazepines.

Is long term use of lorazepam harmful? For most people, yes, past the first month. It is sometimes appropriate for seizure disorders or severe anxiety that has failed everything else, with a prescriber who monitors future use. Those cases are rarer than the number of people prescribed lorazepam long term suggests.

Lorazepam Withdrawal Symptoms and Following Symptoms to Expect

Stopping lorazepam after regular use produces withdrawal symptoms, and stopping suddenly after long term use can be dangerous. Because lorazepam is short acting, withdrawal starts within 6 to 24 hours of the last dose and peaks in the first few days. Watch for the following symptoms.

• Rebound anxiety and panic attacks, often worse than before treatment.
• Insomnia, restlessness, and tremor.
• Sweating, racing heart, and nausea.
• Sensory changes. Light and sound feel too loud.
• Confusion, hallucinations, and delirium in severe cases.
• Seizures. The most serious risk, most likely after high doses or abrupt stopping.

Benzodiazepine withdrawal lasts four to five days in the acute phase, and some people have withdrawal symptoms for months. The fix is a slow taper, cutting 5 to 25 percent at a time with weeks between steps. Nobody should stop lorazepam cold after months of daily use, and anyone mixing it with alcohol or opioids needs medical detox rather than a home taper.

What to Avoid While Taking Lorazepam, From Other Medications to Street Drugs

• Opioids and other substances that depress the nervous system, including sleep aids, muscle relaxants, antihistamines, and other drugs bought without a prescription.
• Driving or operating machinery in the first few hours after a dose.
• Stopping without a plan. Tapering needs a prescriber.

Drink water, eat before a dose if nausea is a problem, and tell every provider that you take this medication.

Can You Drink Alcohol on Lorazepam?

No. Do not drink alcohol on lorazepam. Even a low blood alcohol level multiplies every side effect, sedation and breathing suppression most of all.

What to Do About a Missed Dose

Skip it and return to your regular dosing schedule. Never take two to catch up.

Who Should Not Take Ativan

Lorazepam is a poor fit for people with sleep apnea or other breathing problems, severe liver disease, narrow angle glaucoma, or a history of drug abuse or alcohol problems. Its side effects are worse in every one of those groups. It is also risky for anyone taking opioids and during pregnancy. People with untreated depression should be watched closely.

Addiction Treatment for Lorazepam Dependence in Massachusetts

Plenty of people taking lorazepam as prescribed end up dependent without ever misusing it, and the shame of that keeps them out of addiction treatment. Elevate Recovery Center treats Ativan dependence and benzodiazepine addiction in Massachusetts alongside the anxiety underneath it, so the mental health reason for the prescription gets treated at the same time. Programs run outpatient and virtual, around work and family.

Call (877) 592-2102 or contact us online. We can verify your insurance on the first call.

Sources

1. U.S. National Library of Medicine. (2025). Lorazepam. MedlinePlus.
2. U.S. Food and Drug Administration. (2020). FDA requiring boxed warning updated to improve safe use of benzodiazepine drug class.
3. Robertson, S., Peacock, E. E., & Scott, R. (2023). Benzodiazepine use disorder: Common questions and answers. American Family Physician, 108(3), 260–266.
4. Dowell, D., Ragan, K. R., Jones, C. M., Baldwin, G. T., & Chou, R. (2022). CDC clinical practice guideline for prescribing opioids for pain: United States, 2022. MMWR Recommendations and Reports, 71(3), 1–95.