 Attention all parents and community members in Humboldt County. Fentanyl is a highly potent and dangerous opioid that can cause serious harm. It's a synthetic drug that is often mixed with other substances, making it even more dangerous. Fentanyl is 50 to 100 times more powerful than morphine, and just a small amount can cause a fatal overdose. But there is hope. Mom, what's Narcan? Narcan is a medication that can save a life by reversing the effects of opioid overdose.