I have some multi use vials...

Right now, I am using one for HCG. I know that HCG has to be refridgerated and used w/ in a certain amount of time.

I the 1st amp I reconstituted has about one more dose in it... can I put another amp, once it is reconstituted, in w/ the small amount (I am sure that I won't be able to draw it all out) that is left from the last amp?

And how about other compounds, like test, etc? Is there a point at which they shouldn't be re-used (meaning putting more in over many different occasions)?

Thanks, bros!