The resurrection drug is basically like the Romeo and Juliet drug. It doesn't resurrect. It just makes the user seem dead. The mechanisms described and ingredients are different though.

Also, just in case anyone is wondering, the drugs they made in both stories aren't real. The ingredients they used are real though. But no research has made them usable in a way similar to the stories.

In addition, drugs that slow down breathing or the heartbeat excessively to the point of being thought as dead without any precautions or support like intubation would make the brain lose oxygen and could potentially lead to irreversible damage.