Is oxycodone more addictive than morphine?

Any chemical, if you take too much of it, is dangerous and possibly lethal.

Drinking too much water too quickly can upset electrolyte balance in the brain, nerves & heart. This can easily lead to seizures, heart arrhythmia, unconsciousness and even death. Its called water intoxication.

So, not surprisingly, a powerful opiate like oxycodone can be dangerous in doses even slightly above those recommended by one's doctor. The main dangerous is respiratory depression. Typically, a person breathes about 12-15 times a minute when at rest. Under the influence of opiates, the respiratory drive is diminished (reduced). As the dose increases, the level of respiratory depression increases as well. If one takes too much, then respiratory depression increases to a point where there's not enough oxygen reaching the brain and heart. This can cause further respiratory depression making things even worse. If not treated, this can lead to hypoxia and even death.