the mean percent penetration ( csf conc./serum conc . x 100 % ) with the three dosages was 10 to 50 % for gentamicin , 8 to 23 % for tobramycin , 6 to 16 % for sisomicin , and 11 to 23 % for amikacin .
C0017436
gentamicin
C0037209
sisomicin