lab rat
A lab rat is someone who will try any drug, even the ones that look like they were made in a garbage can. They probably don’t care if they die.
He took a drug that looked like a soup mix. Now he’s green and singing in the lab.
She took a drug that made her eyes glow and her hair turn blue. Now she’s a lab rat and a monster.
He tried a drug and now he can’t stop talking like a robot. He’s a lab rat for life.