Fentanyl is considered dangerous primarily because of its extreme potency, being far stronger than most other opioids. Even very small amounts can cause respiratory depression, where breathing slows or stops, leading to overdose and death. Its effects occur rapidly, leaving little time to respond in an emergency. The risk is further increased because illicit fentanyl is often mixed with other drugs without a user’s knowledge, making dosage unpredictable. In addition, repeated use can lead to tolerance, dependence, and addiction, compounding its potential for harm.
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