Narcan itself is only available as a nasal spray. But naloxone (the active drug ingredient in Narcan) comes in another form: an injection (shot) that’s given in a hospital or clinic. The injection may be intravenous, intramuscular, or subcutaneous.
Narcan nasal spray and naloxone injections have similar side effects. But naloxone injections can cause more severe opioid withdrawal symptoms. This is because naloxone injections can produce higher levels of the drug in your body than Narcan.
If you have questions about the form of naloxone that’s best for you, talk with your doctor.