We've written a lot about many dangerous drugs, most of which you can get with a prescription. But the world's deadliest drug might be a home-cooked synthetic drug using over-the-counter pills as its base. Called "krokodil" in Russia, the drug is a DIY version of desomorphine -- a powerful, fast-acting opioid -- users can make at home using codeine, iodine, and red phosphorous.
And if that doesn't sound appealing, wait until we get to the side effects: gangrene, meningitis, and skin damage with tissue sometimes falling off the bone. And yes, death. Here's what you need to know about krokodil: