A Pharmacy Major was taking a course in Dispensing.

One day they were discussing the various labels
affixed to prescription containers, such as,
"Take with food," and "Take with water."

At the end of class, the professor passed out
a few sample labels.

Days later he noticed that one member of the class
had struck one of them onto his chemistry textbook.

It read: "Caution: May cause extreme drowsiness."