Frequencies for ndcdescription variable in nadacc20170705 dataset :

               NDC Description |      Freq.     Percent        Cum.
-------------------------------+-----------------------------------
 INDOCIN 25 MG/5 ML SUSPENSION |          1        3.45        3.45
          KEPPRA 500 MG TABLET |          1        3.45        6.90
  METHYLPHENIDATE ER 27 MG TAB |          1        3.45       10.34
     OXTELLAR XR 150 MG TABLET |          1        3.45       13.79
     OXTELLAR XR 300 MG TABLET |          1        3.45       17.24
     OXTELLAR XR 600 MG TABLET |          1        3.45       20.69
   PALIPERIDONE ER 9 MG TABLET |          5       17.24       37.93
    TROKENDI XR 100 MG CAPSULE |          2        6.90       44.83
    TROKENDI XR 200 MG CAPSULE |          2        6.90       51.72
     TROKENDI XR 25 MG CAPSULE |          2        6.90       58.62
     TROKENDI XR 50 MG CAPSULE |          2        6.90       65.52
VENLAFAXINE HCL ER 37.5 MG TAB |         10       34.48      100.00
-------------------------------+-----------------------------------
                         Total |         29      100.00

by Jean Roth , jroth@nber.org , 10 Feb 2018