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When and How to Use It

Some general considerations to keep in mind during treatment with Narcan include the following:
  • This medication comes as a liquid that is given as an injection.
  • Narcan may be injected into a vein (an intravenous, or IV, injection), a muscle (an intramuscular, or IM, injection), or under the skin (a subcutaneous, or SC, injection).
  • The injections will be given by a trained healthcare provider.
  • For Narcan to work properly, it must be used as prescribed.

Dosing Information

The Narcan dose your healthcare provider recommends will vary, depending on a few factors, including:
  • Your age
  • Your weight (for children)
  • The reason you are receiving the medication
  • How you respond to it. 
As is always the case, do not adjust your dosage unless your healthcare provider specifically tells you to do so.
(Click Narcan Dosage for more information.)

Side Effects of Narcan

As with any medicine, Narcan can cause side effects. However, not everyone who uses the medication will experience problems. Most people tolerate it quite well.
If side effects do occur, in most cases, they are minor and either require no treatment or are treated easily by you or your healthcare provider. Serious reactions are less common.
Some of the possible side effects of Narcan include:
  • Nausea
  • Vomiting
  • Sweating
  • Increased heart rate (tachycardia).  
(Click Narcan Side Effects to learn more, including potentially serious side effects you should report immediately to your healthcare provider.)
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Narcan Medication Information

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