Quinine and Hydroxychloroquine

The precursor for hydroxychloroquine, Quinine, aka "tonic"; the original antimalarial drug) is also used to cut street Heroin. "Quinine is the most popular cutting agent used in the United States and was found in 68 percent of the samples collected from Washington, Los Angeles, Chicago, New York, and Buffalo."
https://www.addictioncampuses.com/heroin/cut-with/
Does this seem odd to you?

Here's a link to the facts about hydroxychloroquine

And one for Quinine