Rivanol (I) [1837-57-6] injections were susceptible to light, heat (100 or 121.5° for 10 min) and, to a lesser extent to O.AgNO3, CuSO4, MgSO4, Ph(OAc)2, Fe2S3, Na2S and K2CO3 accelerated I precipitationVitamin C [50-81-7], diisopropylamine ascorbate [97401-32-6], NaHSO3, Na2S2O3, Na EDTA [7379-28-4], boric acid and Na pyrosulfite alone or in combinations did not stabilize I injections.