4.1.2. Oral route
Ototoxic effects were not only noted in rats after inhalation
exposure but also after oral application, although the most comprehensive
studies were carried out by inhalation. A study by of
Wang et al. (2001) examined oral dose levels of 400 and 800 mg/
kg bw, however a NOAEL for auditory effects could not be derived
from this study (RAR, 2008). Further studies confirmed ototoxicity
of S by the oral route including: