What do you mean - drug release in vitro or in vivo& If in vitro, carry out dissolution test. Take out volumes of a medium every 5 min if your capsuls belong to immediate release ones and later calculate
I have formulate the micro-capsules of drugs and analyzed the slow release with respect to time using UV-VIS spectrometer. But I don't have half-life time (T1/2) release calculation procedure. I make a standard curve by plotting absorbance vercess concentration. Please guide me the calculation procedure.