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Treating Anxiety – What’s the difference? Ativan vs. Klonopin

Ativan (lorazepam) and Klonopin (clonazepam) are prescription medications used to treat anxiety. They belong to a class of drugs called benzodiazepines, or benzos for short. There are more than a dozen benzos available by prescription, and both Ativan and Klonopin are available as brand and generic medications.

All benzodiazepines are classified as Schedule IV substances by the DEA, which means they carry a low potential for abuse and low risk of dependence when compared to other controlled substances such as opioids.

Benzos work very well for the treatment of anxiety, but because of the risks for abuse and addiction, long term use is generally not recommended. They are often prescribed in addition to other anxiety medications, like antidepressants, Buspar, or Lyrica.

But how do they work?
All benzodiazepines have the same basic chemical structure, and they all work by increasing the activity of GABA receptors in your brain. GABA is a neurotransmitter, or chemical messenger, that affects memory, mood, and pain. By increasing the activity of GABA, benzos slow down your brain and nervous system; this causes a calming and sedating effect.

What other conditions do they treat?
Ativan and Klonopin are both approved by the FDA to manage anxiety disorders and their symptoms. Klonopin is also approved to treat seizure disorders, while Ativan has been approved to treat a specific kind of prolonged seizure called status epilepticus. They are both used off label (which means not approved by the FDA) to treat a variety of other conditions, including sedation of agitated patients, delirium, insomnia, premenstrual syndrome, alcohol and opioid withdrawal, nausea and vomiting caused by chemotherapy, and serotonin syndrome.

What are the main differences?
Ativan is available as an oral concentrate, injectable solution, and oral tablet. Klonopin can be found as an oral concentrate and oral or disintegrating tablet. Both Klonopin and Ativan begin working very quickly, usually within one hour of oral administration. One dose of Klonopin can keep working in your body for up to 12 hours, while one dose of Ativan may last for up to 8 hours.

Which is more effective?
Studies have shown that both Ativan and Klonopin work very well for treating anxiety; one medication has not been shown to be more effective than another. Only your doctor can help decide which medication is best for you and it may require some trial and error before the correct medicine and dosing is found.

How much do they cost?
Generic formulations of both medications are covered by most Medicare and commercial insurance plans; brand names are often not covered or may have a high copay. If you are having trouble paying for medications, Easy Drug Card may be able to provide medication discounts at one of the 65,000+ participating nationwide and local neighborhood pharmacies.

What are some common side effects?
Because Ativan and Klonopin are such similar medications, their side effect profiles are almost identical. The most common side effects include drowsiness, dizziness, and weakness. At higher doses, more serious side effects may be seen; these can include loss of balance, memory impairment, irritability, increased appetite, sexual side effects such as decreased libido, and depression. Older people are more sensitive to these side effects.

Extended use can also lead to tolerance, meaning you may feel like you need to take more and more medication to function normally.

When starting a benzodiazepine, the dose should always be increased slowly and never discontinued suddenly if you have taken it for an extended period of time. These medications should be tapered off slowly under the guidance of a medical professional to prevent withdrawal symptoms such as agitation, increased heart rate and blood pressure, insomnia, tremors, and seizures.

What else should I know?
Both Ativan and Klonopin come with a boxed warning, which is a required warning by the FDA for certain medications that carry serious safety risks. They should never be used in combination with opioid painkillers due to the risk of extreme sedation, severe respiratory depression, coma, or even death. If the combination cannot be avoided, patients should take the lowest dose possible for the shortest period of time under close monitoring by a medical professional.

Ativan and Klonopin have many significant interactions with other medications and substances that can result in serious and life-threatening side effects. You should never combine benzodiazepines with alcohol because of this risk.

Ativan and Klonopin can cause physical and psychological dependence. The risk for this dependence increases with higher doses, longer use, or with a history of drug or alcohol abuse. These medications should never be taken without careful medical evaluation and a prescription from your doctor. They should be taken exactly as prescribed.

Ativan and Klonopin, like all benzodiazepines, are not safe to take during pregnancy. There are conflicting studies for use in breastfeeding women; use is not recommended by the manufacturer.

Both medications are also on the Beers’ List, which is a list of medications that may be inappropriate and unsafe for use in older adults. Because older people are more sensitive to the side effects caused by Ativan and Klonopin, there is a greater risk for cognitive impairment, delirium, falls, fractures, and accidents if they take these medications.

Also see our blog Ativan Vs. Xanax


  1. Bostwick JR, Gardner KN. Anxiety disorders. In: Zeind CS, Carvalho MG, editors. Applied Therapeutics: The Clinical Use of Drugs. 11th ed. Philadelphia, PA: Wolters Kluwer Health, 2018: 1731-61.
  2. Clinical Resource, Appropriate Use of Oral Benzodiazepines. Pharmacist’s Letter/Prescriber’s Letter. December 2020.
  3. Marion, DW. Ativan. In: UpToDate, Post, TW (Ed), UpToDate, Waltham, MA, 2021.
  4. Marion, DW. Klonopin. In: UpToDate, Post, TW (Ed), UpToDate, Waltham, MA, 2021.

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Dr. Joanna L. Hodder

Dr. Joanna L. Hodder is a transitions of care pharmacist for a large hospital system in Denver, Colorado. She received her BA in English Literature from Iowa State University and PharmD from University of Minnesota College of Pharmacy. Dr. Hodder completed a post-graduate year 1 (PGY-1) residency at Northeast Iowa Family Practice Center, where she delivered quality patient care in both hospital and primary care settings. She is passionate about empowering patients to take charge of their health through evidence-based education and improving access to medications. When she isn’t working closely with patients, Dr. Hodder enjoys gardening, hiking with her dog, and yoga.




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