Pharmacy calculation formulas
Density -
D=m/v
half life equation -
t1/2 = 0.693/k
Shelf life equation -
t90%=0.105/k
dilution equation -
C1V1=C2V2
dilution of liquid formulation -
amount of drug (mg)/quantity (mL) X DF = amount (mg)/dose (mL)
Henderson-Hasselbalch equation -
pH = pKa + log [salt]/[acid]
Isotonicity -
% adjusting= [0.52-[(%A x FD1%A)+(%B x FD1%B)....]/FD1% adjusting
SCE -
% adjusting= [0.9-[(%A x SCEa)+(%B x SCEb)....]/SCE adjusting
suppository formulation -
weight base for Y suppositories=[calibration-(dose (g)/DV)] x density x Y
