In a meta-analysis including studies of various durations, the investigators found that Rasilez added to 5mg of Norvasc worked about as well as 10mg of Norvasc alone. I might call this incremental but I would not necessarily call it additive.
To call the combination of Rasilez and Norvasc additive, I would want to see that the combo produced a clinical benefit that was as great as the sum of the benefits of Rasilez monotherapy and Norvasc (5mg) monotherapy. So far, I have not seen any evidence that it does. Hence the comment in #msg-13100149: “Rasilez is apparently not synergistic with Norvasc (the leading calcium-channel blocker) and the clinical benefit may not even be additive.”
“The efficient-market hypothesis may be the foremost piece of B.S. ever promulgated in any area of human knowledge!”