A generic version of Pregabalin is available in Canada and the United Kingdom since 2004.
 Barlow and Proschan [1975] define availability of a repairable system as "the probability that the system is operating at a specified time t
 If we consider an arbitrary constant                     c        >        0              {\displaystyle c>0}  , then average availability is represented as                              A                      c                          =                              1            c                                                          0                                c                          A        (        t        )                d        t        

