What is a Generic Drug?

A generic drug is a copy of the brand-name drug with the same dosage, safety, strength, quality, consumption method, performance, and intended use. Before generics become available on the market, the generic company must prove it has the same active ingredients as the brand-name drug and works in the same way and in the same amount of time in the body.

The only differences between generics and their brand-name counterparts is that generics are less expensive and may look slightly different (eg. different shape or color), as trademarks laws prevent a generic from looking exactly like the brand-name drug.

Generics are less expensive because generic manufacturers don't have to invest large sums of money to develop a drug. When the brand-name patent expires, generic companies can manufacture a copy of the brand-name and sell it at a substantial discount.

Narcan (Naloxone)


Narcan (Naloxone)

Prescription Required


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Generic Equivalent - Narcan (Naloxone)

Prescription Required


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  • Product Details


    What is Narcan?

    • Narcan (naloxone) is a medication used as a reversal agent for opioid drugs.

    How does Narcan work?

    • It works by directly blocking the activity of opioids at their receptor sites to reduce the clinical effects.

    In what forms does Narcan come?

    • You can buy Narcan online as a nasal spray or as an injection.
      • Nasal Spray Strengths - 2mg/0.1mL or 4mg/0.1mL
      • Injection Strengths - 0.4mg/mL, 1mg/mL, 2mg/0.4mL

    How should Narcan be stored?

    • Store your Narcan at room temperature and keep it away from children.


    • Talk to your doctor to learn about how and when to use Narcan.
    • Friends and caregivers of people who are at risk for opioid overdose should learn how to use Narcan.
    • How to use a Narcan Nasal Spray
      • Each nasal spray device contains a single dose. Do not re-use the device.
      • If an emergency overdose situation arises, follow these steps:
        • Check if the patient is overdosing by asking them. If they do not respond, check for the following symptoms:
          • Slow breathing
          • Small pupils
          • Inability to wake up
        • Lay the patient on their back to prepare for giving them a dose.
        • Remove a spraying device from the wrapper.
        • Gently insert the tip of the nozzle into the patient’s nostril and tilt their head back by lifting their neck.
        • Press the plunger of the spraying device to give the dose.
        • Call for emergency help.
      • How to use a Narcan Injection
        • Follow the instructions given by your doctor to administer intravenous injections.
        • If using an auto-injector device:
          • Remove the red safety guard.
          • Place the black end of the device against the outer thigh of the patient. Press firmly for five seconds to administer the dose.
          • Call for emergency help.
        • Usual dosage
          • For opiate overdose
            • Injectable solution – Give 0.4mg-2mg intravenously. You may have to repeat the dose every two to three minutes. If you have not achieved an adequate response after administering 10mg, reconsider the diagnosis of overdose. Narcan can also be given in the muscle (IM) or into the skin (SQ).
            • Nasal sprays – Give one spray (either 2mg or 4mg) into one nostril. You may have to repeat the dose every two to three minutes. Use alternating nostrils for each dose.


    The active ingredient in Narcan is naloxone hydrochloride. For a full list of ingredients, see the package inserts.

    Fact Table






    2% (By mouth, 90% absorption but high first-pass metabolism), 43-54% (Intranasally), 98% (Intramuscular, subcutaneous)

    Legal status

    RX Only

    Chemical Name


    Elimination half-life

    1.8-2.7 hours intranasally, 1.4 hours intramuscularly, and 1.2 hours intravenously

    Dosage (Strength)

    400mg (2 sprays), 400mcg (1 injection)


    Consult a doctor


    Narcan, Evzio, Nyxoid

    Protein binding

    Approximately 45% bound to albumin, but there is significant binding to other proteins

    PubChem CID






    ATC code

    A06AH04, V03AB15





    Routes of administration

    Endotracheal, intranasal, intravenous, intramuscular, intraosseous


    • Do not use Narcan if the patient has a known allergy to any of the ingredients.
    • The patient might have an initial response to a dose but get worse again in a few minutes. Watch the patient closely and give additional doses as needed until emergency help arrives.
    • Patients may experience agitation after receiving Narcan.
    • Do not use Narcan on newborn babies who were born to an opioid-addicted mother. They are at risk of severe withdrawals that could be life-threatening. Call for emergency help and follow the instructions provided.
    • Giving Narcan to an opioid-dependent patient can cause withdrawal symptoms.

    Side Effects


    • Redness at the injection site
    • Dizziness
    • Headache


    • Cardiac arrest
    • High blood pressure
    • Low blood pressure
    • Increased heart rate
    • Ventricular fibrillation
    • Ventricular tachycardia
    • Sweating
    • Nausea
    • Vomiting
    • Coma
    • Encephalopathy
    • Seizure
    • Tremor
    • Pulmonary edema
    • Opioid withdrawal

    Other Considerations

    Where to get Narcan

    • You can buy Narcan online
    • You can buy Narcan at your local drugstore

    IMPORTANT NOTE: The above information is intended to increase awareness of health information and does not suggest treatment or diagnosis. This information is not a substitute for individual medical attention and should not be construed to indicate that use of the drug is safe, appropriate, or effective for you. See your health care professional for medical advice and treatment.

    Product Code : 13255

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