Naloxone Medication Information

Naloxone is an opioid antagonist used as an emergency treatment for suspected opioid overdose. It can rapidly reverse the effects of opioids and may restore breathing in a person experiencing an opioid emergency. Naloxone is available in several forms, including nasal spray products designed for use in emergency situations.

Understanding how naloxone works, when it may be needed, how to recognize an opioid overdose, and why emergency medical care is still necessary can help people respond appropriately during a potentially life-threatening situation.

What Is Naloxone?

Naloxone is a medication that blocks the effects of opioids at opioid receptors. It is used to reverse opioid-related respiratory depression during a suspected overdose.

Opioids include prescription medications such as oxycodone, hydrocodone, morphine, fentanyl, methadone, codeine, and other opioid medicines. Illicit opioids can also cause life-threatening overdose.

Naloxone does not treat pain and is not intended to produce opioid effects. Its primary role is emergency reversal of opioid overdose.

What Is Naloxone Used For?

Naloxone is used for the emergency treatment of a suspected opioid overdose.

It may be used when a person who may have taken an opioid:

  • Cannot be awakened
  • Is extremely sleepy or unconscious
  • Has very slow, weak, or stopped breathing
  • Is making unusual choking, gurgling, or snoring sounds
  • Shows other signs consistent with opioid overdose

The current naloxone nasal-spray labeling identifies the medication as an emergency treatment for opioid overdose. citeturn0search0turn0search1

Naloxone should be considered an emergency response medication. It does not replace professional medical evaluation.

How Does Naloxone Work?

Naloxone works by competing with opioids at opioid receptors in the body. When administered during an opioid overdose, it can displace opioids from these receptors and temporarily reverse their effects.

One of the most important effects is reversal of opioid-related respiratory depression.

Because naloxone can wear off while an opioid may remain active, a person can become unresponsive again after initially improving. Emergency medical assistance is therefore essential even if the person wakes up after naloxone is administered.

Naloxone Nasal Spray

Naloxone nasal spray is designed to provide naloxone through the nose without requiring an injection.

Several FDA-approved nasal-spray products contain 4 mg of naloxone hydrochloride per spray. Current DailyMed labeling describes these products as emergency treatment for opioid overdose. citeturn0search0turn0search3

The exact device instructions can differ between products, so users should follow the instructions supplied with the specific product.

What Should You Do If You Suspect an Opioid Overdose?

A suspected opioid overdose is a medical emergency.

If someone may be experiencing an opioid overdose:

  1. Try to wake the person.
  2. If the person cannot be awakened or is not breathing normally, administer naloxone if available and appropriate for the product.
  3. Call 911 or your local emergency medical service immediately.
  4. Follow the naloxone product instructions regarding additional doses.
  5. Stay with the person until emergency medical professionals arrive.
  6. Continue monitoring the person because opioid effects may return after naloxone temporarily wears off.

Current FDA information emphasizes that naloxone can save a life during an opioid overdose and can be used for overdoses involving prescription or illicit opioids. citeturn0search5

How to Recognize an Opioid Overdose

Possible signs of an opioid overdose include:

  • Unresponsiveness
  • Extreme sleepiness
  • Slow or difficult breathing
  • Very shallow breathing
  • Gurgling or choking sounds
  • Inability to wake the person
  • Pale, clammy, or unusual skin appearance
  • Blue or gray discoloration of the lips or fingertips

Not every overdose looks exactly the same. If opioid overdose is suspected, it is safer to treat the situation as an emergency and seek immediate medical help.

Naloxone Side Effects

Naloxone is generally used during an emergency, and its effects can include sudden opioid withdrawal in a person who has opioids in their system.

Possible symptoms after naloxone may include:

  • Nausea
  • Vomiting
  • Sweating
  • Shaking
  • Restlessness
  • Irritability
  • Anxiety
  • Increased heart rate
  • Body aches
  • Chills

Current naloxone nasal-spray labeling warns that some people may experience shaking, sweating, nausea, or anger when the medication reverses opioid effects. citeturn0search0

These symptoms can be uncomfortable, but the purpose of naloxone during an overdose is to reverse potentially life-threatening opioid effects.

Naloxone and Opioid Withdrawal

Because naloxone blocks opioid effects, it can cause or worsen withdrawal symptoms in someone who is physically dependent on opioids.

Withdrawal symptoms can include:

  • Anxiety
  • Sweating
  • Nausea
  • Vomiting
  • Muscle aches
  • Restlessness
  • Abdominal discomfort
  • Runny nose
  • Shaking
  • Irritability

Naloxone should still be administered when an opioid overdose is suspected. Preventing severe respiratory depression and death is the immediate priority.

Can Naloxone Be Used With Prescription Opioids?

Yes. Naloxone is specifically used to reverse opioid overdose, including overdose involving prescription opioids.

FDA information identifies opioids such as oxycodone, hydrocodone, codeine, morphine, and fentanyl among the medications that can cause an opioid overdose that may be treated with naloxone. citeturn0search5

This is particularly relevant for people who take opioid medications as prescribed as well as people who may be exposed to opioids unintentionally.

Naloxone and Fentanyl

Fentanyl is a powerful opioid, and naloxone is an important emergency medication for suspected fentanyl overdose.

Because fentanyl and other opioids can cause severe respiratory depression, a person suspected of overdose should receive emergency medical attention immediately. Follow the instructions for the specific naloxone product available.

Additional naloxone doses may sometimes be necessary depending on the circumstances and the product instructions.

Naloxone and Other Opioids

Naloxone may be used during suspected overdose involving opioids such as:

  • Oxycodone
  • Hydrocodone
  • Morphine
  • Fentanyl
  • Methadone
  • Codeine
  • Hydromorphone
  • Tramadol
  • Other opioid medications

The presence of naloxone should not encourage taking opioids in unsafe amounts or combining medications without medical guidance.

How Long Does Naloxone Last?

Naloxone temporarily blocks opioid effects, but the duration of action can vary.

Some opioids may remain active in the body longer than naloxone. As a result, a person can become sleepy or unresponsive again after initially responding to naloxone.

For this reason, emergency medical evaluation is necessary after a suspected opioid overdose even when the person appears to recover.

Can Naloxone Cause an Overdose?

Naloxone does not produce the same opioid effects as opioid pain medications and is not considered a controlled substance.

Its primary action is to block opioid receptors and reverse opioid effects.

However, naloxone should be used according to the instructions for the specific product. It should not be viewed as protection against intentionally taking unsafe amounts of opioids.

Naloxone Interactions

Naloxone’s main purpose is to reverse opioid effects during an emergency.

Its most important interaction is with opioid medications because naloxone blocks their effects.

A person receiving naloxone may experience withdrawal symptoms if opioids are present in the body.

Always tell healthcare professionals which medications or substances may have been involved in a suspected overdose when that information is available.

Naloxone for Children

Naloxone can be an important emergency medication when an opioid overdose is suspected in a child or adolescent.

Product labeling should be reviewed carefully because age and product-specific instructions can vary.

If a child may have accidentally taken an opioid medication, treat the situation as an emergency and contact emergency medical services or poison control immediately.

Naloxone During Pregnancy

If an opioid overdose occurs during pregnancy, emergency treatment is necessary.

Naloxone may be used to reverse life-threatening opioid effects when medically appropriate. The priority during an overdose is restoring adequate breathing and obtaining emergency medical care.

Pregnant patients who use opioids should discuss medication use and overdose preparedness with their healthcare professional.

Naloxone and Breastfeeding

People who are breastfeeding should discuss medication questions with a healthcare professional.

During a suspected opioid overdose, emergency treatment should not be delayed because of concerns about breastfeeding. Emergency responders can provide appropriate guidance after the immediate situation is stabilized.

How Should Naloxone Be Stored?

Storage requirements depend on the specific product.

For example, current labeling for certain naloxone nasal sprays provides temperature and handling instructions and advises protecting the product from excessive heat. citeturn0search1

Keep naloxone:

  • In its original packaging
  • Protected according to the product label
  • Away from excessive heat
  • Away from children
  • Accessible enough to be used quickly during an emergency

Check the expiration date regularly and replace expired or damaged products.

Is Naloxone Available Without a Prescription?

Some naloxone nasal-spray products are available over the counter in the United States.

The FDA approved OTC naloxone nasal spray to broaden access to this life-saving emergency medication. In June 2026, the FDA announced approval of another OTC 4 mg naloxone nasal spray. citeturn0search2

Availability can vary by product, pharmacy, and location.

Naloxone and Prescription Medications

People who take prescription opioids should understand the risks associated with opioid medications and know how naloxone can be used during an emergency.

This is especially important when opioids are combined with other substances that can increase sedation or respiratory risk.

People prescribed opioid medications can ask their healthcare professional or pharmacist whether keeping naloxone available is appropriate.

Naloxone and Maxson Pharmacy

Maxson Pharmacy provides medication information to help customers better understand prescription and pharmacy products.

If you have questions about naloxone, opioid medications, medication interactions, or emergency overdose-response products, speak with a qualified pharmacist or healthcare professional.

For additional medication information, you can also review our related pages about opioid medications and their safety considerations.

Frequently Asked Questions

What is naloxone used for?

Naloxone is used as an emergency treatment to reverse the effects of opioids during a suspected opioid overdose.

Is naloxone the same as Narcan?

Narcan is a brand name associated with naloxone nasal spray. Naloxone is the active medication that reverses opioid effects.

Can naloxone reverse an opioid overdose?

Naloxone can temporarily reverse opioid effects, including opioid-related respiratory depression. Emergency medical care is still required because opioid effects can return.

Can naloxone be used for fentanyl overdose?

Yes. Naloxone is an important emergency medication for suspected overdose involving fentanyl and other opioids.

Does naloxone cause withdrawal?

Naloxone can trigger withdrawal symptoms in a person who has opioids in their system, particularly someone who is physically dependent on opioids.

Can naloxone be bought without a prescription?

Some naloxone nasal-spray products are available over the counter in the United States. FDA-approved OTC products have expanded access to naloxone. citeturn0search2

How quickly does naloxone work?

Naloxone nasal spray is designed for emergency use and can rapidly reverse opioid effects. However, the response varies, and additional doses may sometimes be needed according to the product instructions.

Do I still need to call 911 after giving naloxone?

Yes. Naloxone is emergency treatment and does not replace professional medical care. Call 911 immediately when an opioid overdose is suspected.

Can naloxone be used if you are not sure whether opioids were involved?

When an opioid overdose is suspected, naloxone may be appropriate. FDA information notes that naloxone is an important emergency tool for suspected opioid overdose. citeturn0search5

Where can I learn more about naloxone?

For the most current medication information, review the FDA-approved product labeling and DailyMed information for the specific naloxone product being used.

Related Medication Information

Learn more about medications that may be associated with opioid overdose risk:

Learn More About Medication Safety

Understanding medications, potential side effects, drug interactions, and emergency treatment options can help patients and families make safer decisions.

Naloxone is an important part of opioid overdose preparedness. Keeping an appropriate naloxone product accessible may provide a critical emergency response while professional medical help is on the way.

For product-specific instructions, always follow the current labeling supplied with the medication and consult a pharmacist or healthcare professional when you have questions.