It is highly unlikely that a drug that inhibits a mammmalian enzyme would ever work on a fungal one.  Despite the fact that the latter has a similar activity to tryptophan hydroxylase, the mammalian and the fungal hydrozylases have different substratesand different productsaanf chances are that they share very little sequence similarity.

Also, tryptophan hydroxylase and tryptamine hydroxylase are not the same thing.