Narcan

Emergency Opioid Overdose Treatment

Narcan is used for the emergency treatment of a known or suspected opioid overdose. It is designed to rapidly reverse life-threatening symptoms, particularly respiratory depression (dangerously slow or stopped breathing) and extreme sleepiness or loss of consciousness.

This medication works on both prescription opioid pain medications and illicit opioid drugs, including:

• Heroin
• Fentanyl
• Oxycodone
• Hydrocodone
• Morphine
• Codeine

Administration and Availability

Narcan is intended for use by medical professionals as well as family members, friends, or bystanders who witness an overdose. It is available both by prescription and as an over-the-counter (OTC) product. Because Narcan only provides a temporary reversal of opioid effects, it is not a substitute for professional medical care. Emergency medical services must be called immediately whenever an overdose is suspected, even if the person responds to the medication.

Mechanism of Action

Narcan (naloxone) belongs to a class of drugs known as opioid antagonists. It works by competing with opioid molecules for the same receptor sites in the brain and nervous system. When Narcan attaches to these receptors, it displaces the opioids and blocks them from sending signals to the body.

Reversing an Overdose

During an opioid overdose, a person's breathing can slow down significantly or stop entirely. Narcan quickly reverses this effect by neutralizing the opioid's impact on the central nervous system. This helps the person resume normal breathing and regain consciousness.

It is important to understand how Narcan behaves in the body:

• Specificity: Narcan only works on opioids, such as heroin, fentanyl, and prescription pain medications. It will not reverse the effects of overdoses caused by other substances, such as cocaine, methamphetamines, or alcohol.
• Temporary Effect: Narcan is a short-acting medication. Because many opioids stay in the system longer than Narcan, the effects of the overdose may return once the medication wears off, which usually happens within 30 to 90 minutes.
• No Effect Without Opioids: If Narcan is administered to someone who does not have opioids in their system, it generally has no effect on them.

Common Side Effects

Narcan can cause sudden opioid withdrawal symptoms in people who are physically dependent on opioids. These symptoms may include:

• Body aches, shivering, or trembling
• Diarrhea, stomach cramps, nausea, or vomiting
• Fast heartbeat or increased blood pressure
• Fever, sweating, or goose bumps
• Runny nose, sneezing, or yawning
• Nervousness, restlessness, or irritability
• Weakness

Serious Side Effects

In some cases, Narcan may cause serious side effects that require emergency medical care:

• Seizures
• Irregular heartbeat
• Pulmonary edema (fluid in the lungs), which can cause shortness of breath, wheezing, or coughing up pink, frothy sputum

It is important to seek professional medical help immediately after Narcan is used, as the effects of the opioid may last longer than the Narcan, and side effects may need monitoring.

Need for Emergency Medical Care

Narcan is intended for emergency use and is not a substitute for professional medical care. Because the effects of most opioids last longer than Narcan, the person may stop breathing again after the initial dose wears off. Emergency medical services should be contacted immediately after the first dose is administered, even if the person wakes up or responds.

Opioid Withdrawal Symptoms

In individuals who are physically dependent on opioids, Narcan may cause acute withdrawal symptoms. These symptoms can appear within minutes and may include:

• Body aches and tremors
• Diarrhea, nausea, and vomiting
• Increased heart rate and blood pressure
• Fever, sweating, or shivering
• Irritability, nervousness, or restlessness

In infants under four weeks old who are receiving opioids regularly, sudden withdrawal can be life-threatening and may cause seizures or excessive crying.

Cardiovascular Risks

Serious heart-related complications, such as an irregular heartbeat, cardiac arrest, or fluid in the lungs (pulmonary edema), have been reported following the use of naloxone. These risks are more common in patients with pre-existing heart disease or those who have recently taken medications that affect the heart and blood vessels.

Contraindications

Narcan should not be used in individuals with a known hypersensitivity to naloxone hydrochloride or any of its ingredients. Allergic reactions, including skin rashes and anaphylaxis, are possible but rare.

Monitoring and Recurrence

The person who received Narcan must be monitored closely until emergency medical help arrives. If the person does not respond or stops breathing again before help arrives, additional doses may be administered every two to three minutes as directed by the product instructions.

Pregnancy

Narcan is administered during pregnancy in emergency situations to reverse the effects of a known or suspected opioid overdose. Because an overdose is life-threatening for both the pregnant person and the fetus, the use of Narcan is often necessary. However, the medication can cause sudden opioid withdrawal, which may lead to fetal distress.

If Narcan is used during pregnancy, the individual should be monitored by a healthcare professional as soon as possible to evaluate the well-being of the fetus.

Breastfeeding

It is not well-established whether naloxone passes into breast milk or if it has an effect on a nursing infant. Individuals who are breastfeeding or planning to breastfeed should discuss the use of Narcan with their doctor or pharmacist to understand the potential risks and benefits.

Available Forms

Narcan is most commonly found in the following form:

• Nasal Spray: A pre-filled, single-use device used to deliver the medication into the nostrils. This form is available both by prescription and as an over-the-counter product.

The active ingredient in Narcan, naloxone, is also available in other delivery formats, including:

• Injectable Solution: This form is administered using a syringe and needle into a muscle, under the skin, or into a vein.
• Auto-injector: A pre-filled device designed to automatically deliver a dose of the medication when pressed against the skin, typically the outer thigh.

FDA Approval and OTC Status

In March 2023, the U.S. Food and Drug Administration (FDA) approved Narcan (4 milligram naloxone hydrochloride nasal spray) for use without a prescription. This marked the first time a naloxone product was approved for over-the-counter (OTC) use, allowing it to be sold directly to consumers in places like drug stores, convenience stores, and online.

Approved Indications

Narcan is FDA-approved for the emergency treatment of an opioid overdose or a suspected opioid overdose. It is intended for use in adults and children to temporarily reverse the life-threatening effects of opioids, such as respiratory depression (slowed or stopped breathing).

Regulatory History and Access

The FDA has taken several steps to increase access to naloxone products to help combat the opioid overdose crisis. While Narcan is available OTC, other formulations and higher doses of naloxone may still require a prescription. The agency continues to monitor the safety and effectiveness of these products through post-market surveillance.

Safety Communications

There are currently no Risk Evaluation and Mitigation Strategies (REMS) or Boxed Warnings specifically required for Narcan. However, the FDA emphasizes that Narcan is not a substitute for professional medical care, and emergency services should be called immediately after administration.

Emergency Use in Addiction

Narcan is an opioid antagonist used to reverse the life-threatening effects of an opioid overdose. In the context of addiction, it serves as a rescue medication that can restore breathing in individuals who have taken too much of an opioid, such as heroin, fentanyl, or prescription painkillers. It is not a treatment for opioid use disorder and does not reduce drug cravings.

Precipitated Withdrawal

For individuals with a physical dependence on opioids, Narcan can cause immediate withdrawal symptoms. This occurs because the medication quickly removes opioids from the brain's receptors. Symptoms of sudden withdrawal may include:

• Restlessness, irritability, or anxiety
• Body aches and muscle spasms
• Nausea, vomiting, and diarrhea
• Sweating, fever, or chills
• Increased heart rate and blood pressure

Harm Reduction

Narcan is a key component of harm reduction strategies. It has no potential for misuse or addiction. Because its effects are temporary, it is essential to seek emergency medical help immediately after use, as the person may stop breathing again once the Narcan wears off. Following the reversal of an overdose, individuals are often encouraged to seek long-term addiction treatment services.