Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
EXAMPLES FROM THE WEB FOR TRUTH-SERUM
Then, abruptly, "Are you sure that was truth-serum in that hypodermic?"
So the doctors gave him truth-serum so he would not try to conceal anything from them.
What sort of talents and abilities did he possess, that he could react thus to a truth-serum?