Pharmacist and Patient

What is Teva-Naloxone Nasal Spray and how does it work?

Be prepared and get all the details you need about Teva-Naloxone Nasal Spray and how it works.

Teva-Naloxone Nasal Spray is used to treat someone who has overdosed on opioids. Teva-Naloxone Nasal Spray can be used by anyone to reverse the effects of the overdose until medical help arrives. 

Teva-Naloxone Nasal Spray is not a substitute for emergency medical care. Always call 911 before administering Teva-Naloxone Nasal Spray. 

This product may not be suitable for everyone. Always read and follow the patient medication information.

How does Teva-Naloxone Nasal Spray work?

Opioid drugs work by acting on specific receptors found in the brain and in the nervous system. When these drugs attach to those receptors, they reduce the amount of pain felt. Taking too many opioids can lead to an overdose and that can stop someone from breathing. The person may also experience other symptoms.

Teva-Naloxone Nasal Spray stops the opioids from being attached to the receptors and this reverses the effects and symptoms of the overdose.

Is Teva-Naloxone Nasal Spray similar to Narcan® Nasal Spray?

Yes, Teva-Naloxone Nasal Spray is a generic alternative to the brand name Narcan® Nasal Spray. It is a generic drug that contains the same active ingredient as the brand name Narcan® Nasal Spray.
Both products are authorized by Health Canada to treat someone who has overdosed on opioids to reverse the effects of the overdose until medical help arrives. 


Medicinal ingredient Naloxone hydrochloride  Naloxone hydrochloride 
Route of administration  Intranasal  Intranasal 
Dose TEVA-NALOXONE NASAL SPRAY is available as a 4 mg nasal spray device.  NARCAN NASAL SPRAY is available as a 2 mg or 4 mg nasal spray device. 

What are the possible side effects of Teva-Naloxone Nasal Spray?

Possible side effects of Teva-Naloxone Nasal Spray include: 

  • Swelling in the nose
  • Dryness in the nose 
  • Congested nose
  • Runny nose
  • Yawning
  • Nervousness
  • Pain
  • Aggressive behaviours, irritability, restlessness, agitation
  • Blood pressure increased
  • Increased heart rate
  • Nausea, vomiting
  • Diarrhea, abdominal cramps
  • Shivering, chills, tremors, trembling
  • Fever
  • Sweating
  • Weakness
  • Seizures
  • Shaking
  • Muscle spasms
  • Dizziness
  • Headache

How to store Teva-Naloxone Nasal Spray

  • Store Teva-Naloxone Nasal Spray in the blister and cartons provided.   
  • Store between 15°C to 30°C. Can be stored up to 40°C only for short periods of time. Do not freeze or expose to excessive heat above 40°C.
  • Teva-Naloxone Nasal Spray freezes at temperatures below -15°C. If this happens, the device will not spray. If Teva-Naloxone Nasal Spray is frozen and is needed in an emergency, do NOT wait for Teva-Naloxone Nasal Spray to thaw. Get emergency medical help right away. 
  • You can thaw Teva-Naloxone Nasal Spray by allowing it to sit at room temperature for 15 minutes. You can still use it if it has been thawed after being previously frozen.
  • Replace Teva-Naloxone Nasal Spray before the expiration date on the box. 
    • If only expired Teva-Naloxone Nasal Spray is available, it should be used in an overdose situation. 
  • Keep out of reach and sight of children.

1.  Teva Canada. Teva-Naloxone Nasal Spray Product Monograph. January 21, 2021.
2.  Emergent BioSolutions. Narcan® Nasal Spray Product Monograph. March 5, 2021.

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