Generic Rocaltrol is used for managing certain conditions caused by high or low parathyroid hormone levels. It is used to manage low blood calcium levels in patients who are on chronic kidney dialysis. More info »
Regarding the effect: I do notice an increase in bloodflow and a better
stamina using the pills (I use 50mg). A side-effect I have noticed is that
my nose clogs up so I seem like I have a cold for an hour or so after taking
one pill. No other side-effects than that.