Is 'quid pro quo' legal?

Quid pro quo means "something given or received for something else." There is nothing inherently illegal in giving or receiving something in exchange for something else, but in legal contexts quid pro quo often refers to something that is in fact illegal, such as if a company gives a government official money in exchange for receiving a contract that rightly should be given to whatever company is best able to meet the requirements for the contract.

Is 'quid pro quo' bribery?

One might say that every bribe is a case of quid pro quo, but not every quid pro quo is a case of bribery. A bribe is something (such as money or a favor) given or promised in order to influence the judgment or conduct of someone, and while quid pro quo may to be used to describe this, it may also refer to something merely traded for something else.

What does 'quid pro quo' have to do with medicine?

In current use, quid pro quo has little to do with medicine, but the Latin phrase it came from (which may be translated as "something for something") originated with apothecaries (people who prepare and sell drugs or compounds for medicinal purposes). In the 16th through the 18th centuries a quid pro quo often referred to the substitution of one medicine for another.