In a message dated 97-02-19 19:24:34 EST,[log in to unmask] (Brian Collins writes: << the bioavailability can vary, depending on how much Carbidopa is in the system? Sorry for the delay; it is an interesting question, but because the pharmacalogy of this drug is so vastly different from others, I am discussing this with a neuro-pharmacalogist from NIH. If I found a satisfactory answer, I'll post it here. Michel