Does Ativan cause weight gain? Weight gain is not a well-established direct side effect of lorazepam. The FDA prescribing information does not list weight gain among Ativan’s adverse reactions, although it does list changes in appetite [1]. That means some people may notice changes in eating or weight while taking lorazepam, but the medication has not been shown to produce a predictable weight-gain effect. Changes in anxiety, appetite, activity, sleep, alcohol use, or other medications may also influence the number on the scale. If lorazepam has become difficult to reduce or stop, benzodiazepine dependence treatment in Minnesota can help address problematic use and dependence.
The key takeaways:
- Weight gain is not a listed common adverse effect of lorazepam, while changes in appetite are documented.
- Changes in weight during treatment may reflect appetite, activity, mood, sleep, other medications, or other health conditions rather than a direct metabolic effect of lorazepam.
- Decreased appetite and weight loss can occur during benzodiazepine withdrawal.
- Do not stop lorazepam abruptly because of a weight concern. Physical dependence can develop during regular use, and sudden discontinuation can cause serious or life-threatening withdrawal [2].
What the Evidence Says About Ativan and Weight
What the Label and the Trials Show
The Ativan label reports the medication side effects seen most often in trials: sedation in 15.9 percent of patients, dizziness in 6.9 percent, weakness in 4.2 percent, and unsteadiness in 3.4 percent [1]. Further down the list, among gastrointestinal effects, sits “change in appetite,” alongside nausea and constipation. Weight gain does not appear, and neither does water retention. StatPearls, the clinical reference, likewise lists “appetite changes” among common adverse effects and says nothing about weight [3]. A pharmacist-reviewed summary puts it plainly: “Weight changes weren’t reported in clinical trials of people taking lorazepam” [4]. The full list, from drowsiness to memory gaps, is in our chapter on Ativan side effects.
Effects on Weight Gain
Lorazepam has a different adverse-effect profile from psychiatric medications that are well known to affect weight. Benzodiazepines enhance GABA-mediated inhibition in the central nervous system, which helps explain effects such as sedation, relaxation, impaired coordination, and cognitive slowing. Lorazepam has not been shown to have a direct, predictable weight-gain effect or an established metabolic mechanism that would make weight gain an expected adverse reaction. That does not rule out weight changes in individual people, especially when appetite, activity, mood, sleep, or other medications change at the same time. The parent guide explains what benzodiazepines are and how they work.
The Side Effects That Matter More
The more important safety concerns with lorazepam include severe sedation, impaired coordination, respiratory depression, particularly when it is combined with opioids, alcohol, or other CNS depressants, and the risk of physical dependence and withdrawal. The FDA warns that physical dependence can develop after benzodiazepines are taken steadily for several days to weeks, even when they are used as prescribed [6]. Abrupt discontinuation can then cause serious withdrawal reactions, including seizures. The difference between physical dependence, misuse, and addiction is covered in is Ativan addictive.
How Lorazepam Can Affect Weight Indirectly
If the drug itself does not cause weight gain, why do people experience weight gain on it? Because several things change at once when lorazepam treatment starts, and each can influence weight.
Appetite Changes When Anxiety Eases
Anxiety itself can change eating patterns. Some people eat less when they are highly anxious because nausea, stomach discomfort, or loss of appetite makes food less appealing. If treatment reduces those symptoms, appetite may return toward the person’s usual baseline. In someone who had been eating less before treatment, that can look like weight gain even though the medication has not been shown to directly increase body weight. Lorazepam can also cause changes in appetite as an adverse effect, but the direction and size of that change are not predictable.
Sedation and Physical Activity
Sedation is the most frequently reported adverse effect in the Ativan anxiety-treatment data. For some people, feeling drowsy or less coordinated may temporarily reduce exercise or ordinary daily activity, which could indirectly affect weight over time. That pathway is plausible, but it has not been established as a predictable lorazepam effect. Other people may become more active when anxiety improves. How long sedation can last depends on the individual, other medications, and how long lorazepam stays active in the body.
Mood, Sleep, and Alcohol
Lorazepam can cause changes in mood, including depression in some people, and mood changes themselves can alter appetite and eating patterns. Sleep changes may also affect eating and activity, although those effects vary considerably between individuals. Alcohol adds calories and, more importantly, can dangerously increase sedation and respiratory depression when combined with lorazepam. Anyone who drinks while taking the medication should review the drugs and substances to avoid while taking lorazepam with a healthcare professional.
Weight Loss on Ativan and During Withdrawal
Weight loss is not listed as a typical adverse effect of ongoing Ativan treatment, but it is recognized in benzodiazepine withdrawal. Current lorazepam labeling lists gastrointestinal withdrawal reactions including nausea, vomiting, diarrhea, decreased appetite, and weight loss. Mind also lists appetite loss, weight loss, nausea, abdominal cramps, and vomiting among possible benzodiazepine withdrawal effects [5].
Some people informally use the term “benzo belly” for gastrointestinal symptoms that occur during benzodiazepine withdrawal, including bloating, cramps, nausea, bowel changes, and altered appetite. It is not a formal medical diagnosis, and similar symptoms can have many other causes. These symptoms are part of a broader withdrawal picture that can also include serious complications such as seizures, which is why weight concerns are never a reason to stop lorazepam abruptly. The full range of benzodiazepine withdrawal symptoms is covered separately.
Other Factors That Influence Weight While Taking Lorazepam
When weight changes after lorazepam is started, other changes happening at the same time may make the cause difficult to identify.
- Other psychiatric medications. Many people prescribed lorazepam for short-term anxiety relief also take antidepressants for longer-term treatment. Mayo Clinic notes that weight gain can occur with many antidepressants and identifies paroxetine, mirtazapine, several tricyclic antidepressants, and some MAOIs as medications more commonly associated with it [6].
- Age and activity. Older adults are more sensitive to lorazepam’s sedating effects, which may affect balance, mobility, and activity levels.
- Lifestyle factors. Changes in sleep, eating, physical activity, and alcohol use can all influence body weight independently of the medication.
- Other medical conditions. Thyroid disorders, heart or kidney disease with fluid retention, and other medications such as corticosteroids can also change weight and may need medical evaluation.
- Dose and duration. Some adverse effects of lorazepam, particularly sedation and other CNS effects, can become more pronounced at higher doses. Longer regular use also increases concern about physical dependence and withdrawal, although it does not necessarily intensify every side effect[6].
A sustained trend is more useful than a single scale reading when trying to determine whether a medication or another factor may be contributing.
What to Do If You Experience Weight Changes on Ativan
If your weight changes noticeably after starting lorazepam, look at the overall pattern rather than assuming the medication is the cause. Keep track of changes in appetite, activity, sleep, alcohol use, and any other medicines started around the same time. Contact a healthcare professional sooner if the change is rapid, unexplained, or accompanied by symptoms such as swelling, persistent vomiting, severe appetite loss, weakness, or other new health problems.
Do not stop lorazepam abruptly because of a weight concern. Physical dependence can develop with continued benzodiazepine use, and the FDA warns that sudden discontinuation or rapid dose reduction can cause serious and potentially life-threatening withdrawal [2]. If reducing lorazepam is appropriate, a healthcare professional can determine whether a gradual taper is needed. The process is covered step by step here.
Treatment should also address the reason lorazepam was being used, whether that is anxiety, insomnia, or another condition. Options may include psychotherapy, non-benzodiazepine medication, sleep treatment, and lifestyle changes depending on the individual. Anyone considering supplements or other nonprescription approaches should review natural alternatives to Ativan and discuss them with a prescriber or pharmacist first.
Frequently Asked Questions About Ativan and Weight
What Is Benzo Belly?
“Benzo belly” is an informal term some people use for gastrointestinal symptoms during benzodiazepine withdrawal, such as nausea, abdominal cramps, bowel changes, appetite loss, or bloating. Decreased appetite, weight loss, nausea, vomiting, and diarrhea are recognized withdrawal symptoms [5]. The term is not a medical diagnosis, and there is no single predictable duration. Persistent or severe gastrointestinal symptoms should be medically evaluated.
Which Anxiety Medications Cause the Most Weight Gain?
Among medications used for anxiety disorders, antidepressants carry the clearest weight-gain risk. Mayo Clinic names paroxetine, mirtazapine, tricyclics such as amitriptyline, and MAOIs such as phenelzine as more likely to cause weight gain [6]. Benzodiazepines such as lorazepam and Xanax are not on that list; their documented effect is on appetite, not weight.
What Happens If You Take Lorazepam Every Day?
Taking lorazepam every day can lead to tolerance and physical dependence, although neither develops on exactly the same timeline in every person. The FDA warns that physical dependence can occur after steady benzodiazepine use for several days to weeks, even at prescribed doses, and abrupt discontinuation can cause life-threatening withdrawal [6]. Weight gain is not a listed common direct adverse effect of lorazepam; if weight changes occur, appetite, activity, sleep, other medications, and underlying health conditions may all contribute.
Final Thoughts: Getting Help With Ativan in Minnesota
If lorazepam has become difficult to reduce or stop, the more important question is not what the scale says but whether the medication is still helping safely. Do not make a sudden change after regular use. A healthcare professional can assess whether physical dependence has developed and whether a gradual taper is appropriate. Northwoods Haven’s intensive outpatient program provides treatment for substance use alongside anxiety and other mental health concerns on a schedule designed around work and family. Reach out for a confidential conversation about where to begin.
Sources
- U.S. Food and Drug Administration, ATIVAN (lorazepam) tablets prescribing information, revised January 2023. https://www.accessdata.fda.gov/drugsatfda_docs/label/2023/017794s049lbl.pdf
- U.S. Food and Drug Administration, “FDA Requiring Boxed Warning Updated to Improve Safe Use of Benzodiazepine Drug Class,” Drug Safety Communication, September 23, 2020. https://www.fda.gov/drugs/drug-safety-and-availability/fda-requiring-boxed-warning-updated-improve-safe-use-benzodiazepine-drug-class
- Ghiasi N, Bhansali RK, Marwaha R. “Lorazepam.” StatPearls, National Library of Medicine, updated May 25, 2024. https://www.ncbi.nlm.nih.gov/books/NBK532890/
- Medical News Today, “Lorazepam Oral Tablet Side Effects: How to Manage Them,” medically reviewed by Rosanna Sutherby, PharmD, December 10, 2022. https://www.medicalnewstoday.com/articles/drugs-lorazepam-tablet-side-effects
- Mind, “Withdrawal Effects of Benzodiazepines,” published April 2021, last updated December 2024. https://www.mind.org.uk/information-support/drugs-and-treatments/sleeping-pills-and-minor-tranquillisers/withdrawal-effects-of-benzodiazepines/
- Mayo Clinic Staff, “Antidepressants and Weight Gain: What Causes It?”, August 17, 2024. https://www.mayoclinic.org/diseases-conditions/depression/expert-answers/antidepressants-and-weight-gain/faq-20058127
