I'm firmly in the camp of needing that where my skills are concerned, so you might be better to ask some of the more magic healers if they have a workaround.

I thought we did buy a bunch of medicine, none of it was an immunosuppressant? Hm.

[ He considers this for a moment, he remembered what Haibara had asked for and Curufin said he'd order them. ]

There should be Cyclosporine in the medicine, that's meant to deal with organ rejection.