"Drug approval" refers to the process through which a government agency or regulatory body gives its permission for a new medication to be legally available for use. Full definition
There was a 64 percent increase in new drug approvals in the most recent timeframe of 2011 to 2015, compared to 2006 - 2010. (nreionline.com)
Further, as I noted here, drug approval decisions necessarily involve policy considerations, and can not be resolved by science alone. (volokh.com)
There are only four drugs that have been approved to treat the symptoms of the disease, and the most recent drug approval happened in 2003. (businessinsider.com)