A drug that counteracts the effects of another drug.

Examples are Naltrexone (Vivitrol) and Naloxone (NARCAN), both used to prevent or reverse the effects of opioid overdose.

Find out more about NARCAN here.

Find out more about Vivitrol here.

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addiction SUD Substance Use Disorder MAT Medication Assisted Treatment relapse prevention drug drugs opiates Opioid