You're thinking about narcan. It binds with the opiates in your system and pulls them out of your neurotransmitters. This is an actual vaccine, it trains your

You're thinking about narcan. It binds with the opiates in your system and pulls them out of your neurotransmitters. This is an actual vaccine, it trains your immune system to respond to the substance. Once that training is done, you don't need any amount of the original vaccine substance to be in your body. Besides, how would that even work if you took the vaccine and a month later used meth? That vaccine isn't in your body anymore.