Fentanyl is a synthetic opioid that is up to 50 times stronger than heroin and 100 times stronger than morphine.
There are two types of fentanyl: pharmaceutical fentanyl and illicitly manufactured fentanyl. Both are considered synthetic opioids. Pharmaceutical fentanyl is prescribed by doctors to treat severe pain. Illicitly manufactured fentanyl is distributed through illegal drug markets and is often added to other drugs because it is so strong, which makes drugs cheaper, more powerful, more addictive and more dangerous.