While there are many alternative interpretations of this song, it seems to be the case that Velvet Underground leader Lou Reed
was merely describing the effects of the drug, while neither condemning it nor condoning it. It might have been done merely for shock value, or because Reed liked gritty subjects, or as a dark poem of addiction; the beauty of this song is that it works on all of these levels, and many more, at the same time. In many of his songs, we have cases where Lou Reed kept the focus on providing an objective description of the topic without taking a moral stance on the matter.
For the record, Reed spoke of the meaning of some of his songs in a 1971 interview with Creem
magazine: "I meant those songs to sort of exorcise the darkness, or the self-destructive element in me, and hoped other people would take them the same way. But when I saw how people were responding to them, it was disturbing. Because, like, people would come up and say, 'I shot up to 'Heroin,' things like that. For a while, I was even thinking that some of my songs might have contributed formatively to the consciousness of all these addictions and things going down with the kids today. But I don't think that anymore; it's really too awful a thing to consider."