not sure what numbering system means, so "FIVE" is what you get. Within amonth of starting this med, I got terrible flu-crud-yuk [which happens in winter]. Towards end of this illness [for which series of antibiotics was taken], I had pain in my left side and some shortness of breath, which I initially just blamed on the flu. Now, after reading others' comments, I wonder if this drug may have brought on the illness. After a month and a half, I've quit!