When using Draino to unclog a kitchen sink,should you pour in both sinks or just the side without the disposal?

I poured it in the one side yesterday and it seems that I can run water in that side now with no problem but when I run water in the side that has the disposal, the water comes up through the other side. I wasn’t sure if it was safe to use Drano on both sides. And I realize some people don’t agree with solutions to unclog drains but this is the route I’m taking

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