Fentanyl is a synthetic opioid which is 100 times stronger than morphine and 50 times stronger than heroin. Simply touching it can cause a person to overdose.

Fentanyl inhibits pain signals in multiple pathways along the brain and spinal cord, and it also causes your brain to make extra dopamine creating sensations of intense euphoria and relaxation. Essentially, it hijacks your body’s built-in system of endorphins by binding to your opioid receptors much in the same way your endorphins do but at a much stronger level. As a result, it suppresses your brain’s ability to detect carbon dioxide levels in the body, potentially causing you to stop breathing. Other side effects include dizziness, chills, vomiting, fainting, difficulty urinating and extreme constipation. Watch AsapSCIENCE’s look into one of the deadliest drugs below.

References: NIH, NIHCM, Open Chemistry Database, DrugBank, NIST