Here we could success about the use of different antibiotics for mushroom cultures.

I have experimented with psilocybe cubensis and chloramphenicol on PDA and found out, that cultures did not grow very fast, and spores did not germinate at all. A piece of mushroom tissue was added to PDA with chloramphenicol, and it grew very slowly, strandy growths were very thin, only seen under magnifying glass.

At the same time a sample from the same tissue was added to PDA with H2O2 and ordinary PDA without any additives. The both samples were fully overgrown when the growth of the sample with chloramphenicol was still hard to see.

PDA=Potato Dextrose Agar

Do you have any experience using antibiotics during the first stage of mushroom growing/cloning?

Yes, to fight contaminations (bacteria) when using spore prints from wild mushrooms.

Where did you get the Antibiotics? I have a few from previous times I was sick, would they work?

I will try it with the antibiotics I have when I get the chance. Right now I am trying to get an agar culture going of Agaricus bisporus (button mushroom). I made the spore prints from store bought mushrooms, and didn't bother to sterilize much besides the water and syringe I used to make a spore syringe. I'll see if this gets infected with anything and if it does, I'll use the same syringe and use agar with antibiotics to see if it prevents it. Hopefully though, they just won't get infected.