Frequencies for first 10,000 rows of drug_rec_act variable in reac2017q3 dataset :

                           drug_rec_act |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                                        |      9,984       99.84       99.84
                        Acute psychosis |          1        0.01       99.85
                               Asthenia |          1        0.01       99.86
                             Depression |          1        0.01       99.87
               Disturbance in attention |          1        0.01       99.88
                    Febrile neutropenia |          1        0.01       99.89
                               Headache |          1        0.01       99.90
               Hepatitis B reactivation |          1        0.01       99.91
                              Influenza |          1        0.01       99.92
                         Joint swelling |          1        0.01       99.93
                           Pericarditis |          1        0.01       99.94
                       Pleural effusion |          1        0.01       99.95
                              Pneumonia |          1        0.01       99.96
                            Pneumonitis |          1        0.01       99.97
                                 Sepsis |          1        0.01       99.98
                              Urticaria |          1        0.01       99.99
                         Vision blurred |          1        0.01      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 8 Feb 2018