Benzodiazepine Overdose
Taking too much of a sedative medication
Quick Facts
- Type: Medical emergency (drug overdose)
- Drug class: Sedatives such as diazepam, alprazolam
- Greatest danger: Mixing with opioids or alcohol
- Action: Call emergency services immediately
Overview
Benzodiazepines are a group of sedative medications used to treat anxiety, insomnia, seizures, and muscle spasms. Common examples include diazepam, alprazolam, lorazepam, and clonazepam. They calm the nervous system, and taking too much can dangerously slow brain and body function.
A benzodiazepine overdose is a medical emergency. If you suspect an overdose, call your local emergency number right away. On their own, benzodiazepines are less likely to be fatal than some other drugs, but the danger rises sharply when they are combined with opioids, alcohol, or other sedatives, which can together cause breathing to slow or stop. This page is for general education and does not replace emergency medical care.
Signs and Symptoms
An overdose causes the sedating effects to become extreme. Signs may include:
- Severe drowsiness or difficulty staying awake
- Confusion and slurred speech
- Poor coordination, unsteadiness, or stumbling
- Slow, shallow, or irregular breathing
- Weakness and dizziness
- Blurred or double vision
- Unresponsiveness or loss of consciousness in severe cases
Slowed or stopped breathing is the most dangerous effect, especially when benzodiazepines are mixed with opioids or alcohol. If someone cannot be woken, is breathing slowly, or has stopped breathing, call emergency services immediately.
Causes
A benzodiazepine overdose happens when the amount taken overwhelms the body's ability to process it. This can occur in several ways:
- Taking more than the prescribed dose, intentionally or by mistake
- Combining benzodiazepines with opioids, alcohol, or other sedating drugs, which multiplies their effect
- A child accidentally swallowing medication
- Confusion about dosing, especially in older adults or those taking several medicines
- Misuse of benzodiazepines obtained without a prescription
Because many overdoses involve a combination of substances, mixing sedatives is the single biggest risk.
Risk Factors
- Using benzodiazepines together with opioids, alcohol, or other sedatives
- Older age, which slows how the body clears the drug
- Taking high doses or using them long-term
- Liver or kidney problems that affect drug processing
- A history of substance use disorder
- Storing medication where children can reach it
Diagnosis and Evaluation
In an emergency, doctors focus first on supporting breathing and circulation, then on confirming what was taken. Evaluation may include:
- Assessing the person's level of alertness, breathing, and vital signs
- Asking witnesses or checking pill bottles about what and how much was taken
- Blood or urine tests to detect drugs and check organ function
- Monitoring oxygen levels and heart rhythm
It is important to tell medical staff about all substances involved, including alcohol and opioids, because combinations change the risk and treatment.
Treatment
Treatment centers on supporting the body until the drug wears off.
- Supportive care: Close monitoring, oxygen, fluids, and help with breathing if needed are the foundation of treatment.
- Reversal medication: A drug called flumazenil can reverse benzodiazepine effects, but it is used cautiously and only in select situations because it can trigger seizures, especially in people who use benzodiazepines regularly or have taken other drugs.
- Treating combined overdoses: If opioids are also involved, naloxone may be given to reverse the opioid effect, and breathing support is critical.
Most people recover fully with prompt supportive care. Anyone who overdosed intentionally should be connected with mental health support.
Prevention
Overdoses can often be prevented with safe use of these medications:
- Take benzodiazepines only as prescribed and never share them
- Do not combine them with alcohol, opioids, or other sedatives unless a doctor specifically advises it
- Store medicines securely and out of reach of children
- Review all your medications with a pharmacist or doctor to avoid dangerous combinations
- Talk to your doctor before stopping benzodiazepines, since stopping suddenly can be harmful
When to Get Emergency Help
Call emergency services immediately if you suspect a benzodiazepine overdose, especially if the person:
- Cannot be woken or is very difficult to rouse
- Is breathing slowly, shallowly, or has stopped breathing
- Has blue-tinged lips or skin
- Has taken benzodiazepines with opioids or alcohol
While waiting for help, keep the person awake if possible, place them on their side if they may vomit, and be ready to follow the dispatcher's instructions. In the United States you can also contact Poison Control for guidance.
Frequently Asked Questions
Is a benzodiazepine overdose dangerous on its own?
Benzodiazepines alone are less likely to be fatal than some other drugs, but an overdose can still cause extreme drowsiness, confusion, and slowed breathing. The danger rises sharply when they are mixed with opioids or alcohol, which can stop breathing.
What should I do if someone overdoses on benzodiazepines?
Call emergency services right away. Try to keep the person awake, lay them on their side if they may vomit, and watch their breathing. Tell responders everything they took, including any alcohol or opioids, since combinations change the treatment.
Is there an antidote for benzodiazepine overdose?
A medication called flumazenil can reverse benzodiazepine effects, but doctors use it cautiously because it can trigger seizures, especially in regular users or when other drugs are involved. Most cases are treated mainly with supportive care and breathing support.
Why is mixing benzodiazepines with opioids so risky?
Both benzodiazepines and opioids slow breathing and sedate the nervous system. Taken together their effects multiply, making dangerously slowed or stopped breathing much more likely. This combination is a leading cause of overdose deaths.
How can benzodiazepine overdose be prevented?
Take these medicines only as prescribed, never mix them with alcohol or opioids unless a doctor advises it, store them safely away from children, and review all your medications with a pharmacist. Do not stop them suddenly without medical advice.
References
- MedlinePlus, U.S. National Library of Medicine. Benzodiazepine overdose.
- Centers for Disease Control and Prevention (CDC). Benzodiazepines and Opioids.
- National Institute on Drug Abuse (NIDA).
- American Association of Poison Control Centers.