Growing evidence suggests Iran has weaponized pharmaceutical agents that could be added to weapons like artillery and grenades.Morteza Nikoubazl/NurPhoto via Getty ImagesIran is believed to have weaponized pharmaceutical agents to kill or incapacitate.These chemical weapons affect a victim's central nervous system.These are especially a problem if Iran supplies them to militant allies like Hezbollah and Hamas.Iran has developed chemical weapons based on synthetic opioids such as fentanyl, warns a US expert, powerful agents that could incapacitate soldiers or civilians when added to grenades or artillery.Pharmaceutical-based agents, or PBA, are essentially weaponized medicines that incapacitate or kill their victims depending on the exposure.