Maybe he is pregnant.
On a serious note, many chemical can cause a metallic taste. some corticosteroids, vasotec, vancocin, flagyl.....
I highly doubt that M1T has caused that much liver damage in the time period reported to the extent that there would be issues with either copper or iron. Unless preexisting Wilson's disease, hemochromatosis, or cirrhosis was present.
He would most likely experience jandice, ascites and extreme lethargy as well.
I am with Ubi most people seem to blow liver toxicity way out of proportion.