Assessment of light stability of drugs in blood and plasma.

Aim: A procedure was developed for the assessment of photochemical stability of drugs in blood and plasma under standardized conditions. The procedure avoids a variable outcome of photochemical stability experiments and tests relevant worst case conditions so that unnecessary light protection is avoided. Results/methodology: Blood and plasma were spiked with a mixture of drugs and incubated in a Suntest CPS+, in the laboratory on the bench and near the window on a sunny summer day. The results were compared. Discussion/conclusion: No protection from light, limited protection from light and full protection from light are advised for drugs that are stable in plasma in the Suntest CPS+ at 250 W/m2 for at least 30 min, for 5–30 min and for <5 min, respectively.