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Rotating your image such that the text is readable would be a useful modification.

In the middle right (under BLOND) is the word Schlange, which is German for snake and also a German surname.

At the bottom, there appears to be a repeated sequence of characters which might be the Polish surname Zakrzewski. There's also a digit sequence 098765-543210 012345-567890.

Hope that helps.

This looks like the work of a schizophrenic. It sounds demeaning but I've seen similarly "encoded" messages, often around some common item (like a cigarette pack). They write them during psychosis and later find them and obsess over their decryption.

Judging by the image of the cigarette pack and the handwriting, this is clearly a doctor's prescription.

Could you tell a bit more about where, when, how you found it?

I found it while canoeing along a canal in Hamburg, July of 2016. That's all the detail I remember.