Oh ok, I got ya. So no matter the mg dosage the half-life is the same (Epi being approx 6 hours)?
According to this chart I believe so, but that doesn't make me happy.
No this shouldn't concern either one of you. Half-life is the time is takes for half that "stuff" to be excreted by the body. So regardless of what it is, if the half life is 2 weeks and you take 500mg then after 2 weeks 250mg is left.
Considering the generic case, the concentration at time t, which is C(t) is
C(t)=C(0)(0.5)^(t/half-life)
where C(0) is how much you take, t is the time since you took it, and half-life is the half-life. The time, t, and the half-life need to be in the same units. So the 2 week half-life should be 14 days, t is the number of days since the dose, C(0) is the amount you take and C(t) is the amount left after t days. As in the example mentioned, C(0) is 500mg so,
C(t)=(500mg)(0.5)^(t/14)
Now.... in reality it gets more complicated. If you are on test-e and we assume a half life of 14 days, for example, you probably take 250mg every 3.5 days.
So you take your first shot and
C(t)=(250)(0.5)^(t/14)
and after 3.5 days
C(t)=(250)(0.5)^(3.5/14)=210mg
then you take another shot so you now have
210mg+250mg=460mg
then 3.5 days later
C(t)=(460mg)(0.5)^(3.5/14)=387mg
As your cycle continues, more and more build in your body but not all of it is active. The ester needs to be cleaved before it is active so taking 387mg all at once is not the same as taking 250, waiting 3.5 days and then taking another 250mg.
This is an incredibly difficult topic which I'll come back to later to explain better but for now I need sleep to prep for the holidays tomorrow.