Well, we've had similar drugs (though not vaccines) for a while I believe, and they don't always work as they should. A guy I worked with was a recovering alco

Well, we've had similar drugs (though not vaccines) for a while I believe, and they don't always work as they should. A guy I worked with was a recovering alcoholic on a "return-to-work" program. As a part of this program he had to take antabuse to stop him from drinking again. He died from a fatal heart attack within a month after he started working. It turns out he'd secretly still continued to drink even while on antabuse, which put an immense strain on his heart (antabuse gives tachycardia on consuming alcohol), causing the heart attack. Sad story. Alcholics have a really strong urge to drink, even though it causes discomfort.