Verse 1 of the lyrics shows how afraid the man (Edward, if related to the
movie Breaking Dawn) is of losing his lover (Bella). The first two lines are
related to the last three lines. The lines ‘If you ever leave me, baby’ and ‘Leave
some morphine at my door’ describe how painful his feeling is if his lover ever
leaves him. Morphine is a powerful and addictive drug used for stopping pain and
making people calmer. However, the morphine in this line should not be
interpreted literally; instead there is a connotative meaning within this line. This
line implies that if the man loses his girl, he will feel great sadness. The writer of
this song (Bruno Mars) makes a comparison of a thing to another that has
something in common. This style is called a metaphor. The next three lines make
the meaning of the metaphor in the first two lines clearer. The lines ‘Cause it
would take a whole lot of medication’, ‘To realize what we used to have’, and
‘We don’t have it anymore’ tell the listeners that the man (Edward) would need a
lot of efforts and time to heal the pain if the woman (Bella) leaves him. The
morphine represents the idea that the great sadness will take much effort to relieve
it. The phrase a whole lot of medication in the third line of the Verse 1 may refer
to much time and efforts (not literally means medicine).