Jtu,
In my most humble opinion, Norvasc is a med that seems to have more side effects than most, is overpriced, and really best designed for hypertensives with angina and heart failure.
However, if you can escape side effects, it works well to bring down BP for a lot of people who need to add a 3rd drug to their regimen.
In theory, it's full effect would probably show up within two weeks.
zuzu xx