Nov 23rd 2022
Lorazepam is a benzodiazepine that is primarily used to treat anxiety disorders and recurrent or enduring epileptic seizures. It is important to use this medication exactly as prescribed and to consult with your doctor prior to starting any other medications (prescribed or over the counter) while taking lorazepam, as adverse effects can occur.
Lorazepam is mostly prescribed for the treatment of severe anxiety. It can also be prescribed for frequently recurring or enduring epileptic seizures, known as status epilepticus, for insomnia, or as an anesthetic premedication .
These are the FDA approved uses for lorazepam, but it can also be prescribed for other reasons, including the treatment of drug or alcohol withdrawal symptoms and to help alleviate nausea and vomiting in chemotherapy patients . When lorazepam is prescribed for these reasons, this is known as ‘off-label’ use.
Lorazepam is not approved by the Food & Drug Administration (FDA) for use by children under 12 years old, as they may be more likely to experience dangerous side effects .
Lorazepam enhances a naturally occurring neurotransmitter in the brain called GABA, which helps calm the central nervous system and reduces symptoms of anxiety. As it can help regulate sleep and induce feelings of relaxation and anxiety, it can be used to treat various disorders and symptoms .
Lorazepam comes in 0.5mg, 1mg, and 2mg tablets, which are swallowed whole; in liquid form, which is diluted in water or a soft drink or swallowed with food; or as an injection, which is administered intramuscularly (into a muscle) or intravenously (into a vein).
Depending on the condition that is being treated, you may receive a daily prescription of between 1-10mg, prescribed at either specified times or to take as it is required (PRN). Never take more than your doctor has prescribed for you.
Your prescription will depend on the severity of your condition, your age, and your weight/size, as these will all impact the effectiveness of the medication.
It is important you take your medication exactly as prescribed, to prevent adverse effects. If you are taking lorazepam for anxiety and miss a dose, you can take it when you remember, as long as it is within three hours of the prescribed time. Otherwise, skip that dose and take your next dose at the specified time. If you miss a dose that has been prescribed for insomnia, skip the dose entirely until the following night. Never take double the amount you have been prescribed.
Your doctor will likely advise that this treatment only continues for a short period of time, to prevent you developing a physical or psychological dependence on the medication. They will then likely reduce your daily prescription slowly, to prevent you from experiencing withdrawal symptoms .
When taken by mouth, lorazepam begins working in 20-30 minutes. When injected intravenously, it begins working within 1-3 minutes, and when injected intramuscularly, it will begin working in around 15 minutes.
You will continue feeling the effects for 6-8 hours and it will be entirely out of your system after 14 hours.
Withdrawal symptoms can last several months after stopping the medication if a physical dependency has occurred. You may be more likely to experience withdrawal symptoms if you have taken large doses for prolonged periods, or if the medication is misused or abused .
This anti-anxiety medication causes sedation, so it is advised that you do not drive while on this medication if you feel very sleepy or drowsy.
Common side effects of lorazepam include:
Serious side effects are less common but may occur. If you experience any of the following symptoms, or any persistent side effects that are becoming problematic, you should consult your doctor:
In very rare cases, Lorazepam may trigger an allergic reaction. If you experience any of the following, you should call 911 or go to the emergency room immediately.
Discuss with your doctor all your current and previous physical and mental health conditions, as this may impact your ability to take this medication safely.
Because of the side effects of lorazepam, tell your doctor if you have ever experienced breathing problems such as asthma or sleep apnea, liver or kidney problems, or glaucoma.
It is important to tell your doctor if you have ever had an alcohol or substance use disorder, as this medication can be addictive, so it may not be suitable for you.
Tell your doctor about all medications you are taking, or plan to take (including vitamins and dietary supplements), as they may cause adverse reactions.
Lorazepam can cause you to feel very sleepy, so it may not be safe to drive or use machinery while on this medication.
If you are pregnant or plan to get pregnant, you should discuss this with your doctor before taking lorazepam, as it can cause your baby to be born with withdrawal symptoms or physical defects . It can still be taken while pregnant if the benefits outweigh the risks, and it is vital for your treatment.
Inform your doctor if you have any planned surgery, as lorazepam can impact the effects of anesthesia.
Lorazepam causes a sedative effect, so it must not be used with any opiate medications, such as morphine, hydrocodone, or oxycodone, as there is an increased risk of severe breathing problems that may lead to coma or death .
If you are using any other sedating medications, such as certain antihistamines, tranquilizers, or muscle relaxants, there may be an increased risk of breathing problems or oversedation. If you are taking any of these medications, discuss this with your doctor prior to beginning lorazepam.
Certain mental health medications may interact with lorazepam, such as various antidepressants and antipsychotics. These may increase side effects, so always discuss with your doctor first to understand how to take these medications safely.
Alcohol and other substances can increase the risk of heart, liver, or kidney problems if used alongside lorazepam and so the use of this medication alongside alcohol or recreational drugs is strongly discouraged, as they may exacerbate side effects and even increase the risk of overdose.
Always keep all medications out of reach of children.
Store lorazepam in its original packaging, in airtight containers, and at room temperature (never above 86 F).
If you need to dispose of medication that is out of date or no longer needed, contact a medical professional to ensure it is disposed of appropriately. Never flush medications down the toilet or put them in the bin, as this can create unnecessary risks.
If you overdose on lorazepam, call a medical professional or Poison Control on 1-800-222-1222, or if emergency medical attention is required, call 911.
A severe overdose can cause breathing problems, collapse, confusion, loss of consciousness, coma, or even death. There is a medication that can reverse lorazepam effects, although this must be given by a professional, who will decide if it is necessary .
It is not safe to drink alcohol while on lorazepam. Alcohol can increase the sedative effect of lorazepam, which can result in breathing difficulties or an inability to awaken. It may also increase the risk of liver problems.
Lorazepam can be addictive, so it is usually prescribed as a short-term treatment option - typically under four months - and must be taken as prescribed. As such, suddenly stopping can cause withdrawal symptoms, so your doctor may slowly reduce your dose of lorazepam before stopping your prescription to prevent this. You should never suddenly stop taking prescribed medication without medical advice and supervision.
The two medications are very similar in cost, effectiveness, onset time, and side effects.
Both lorazepam (Ativan) and clonazepam (Klonopin) are benzodiazepine medications, so have similar effects on the brain and body. Clonazepam may also be prescribed for the treatment of anxiety-related symptoms or epileptic seizures, although they are FDA approved for slightly different uses .
Our Medical Affairs Team is a dedicated group of medical professionals with diverse and extensive clinical experience who actively contribute to the development of our content, products, and services. They meticulously evaluate and review all medical content before publication to ensure it is medically accurate and aligned with current discussions and research developments in mental health. For more information, visit our Editorial Policy.
MentalHealth.com is a patient-first health technology company driven by its mission to make optimal mental health attainable for everyone. With a focus on expanding care access, empowering patient choice, and enhancing care quality, the company delivers innovative solutions that support individuals throughout their mental health journey.