OK A Few Week's Ago I Went To See An

OK a few week's ago I went to see an ortho Dr requarding pain in my Rt leg due to an auto accident 30 yrs ago ---to make a long story short ----my ankle has been killing me & I keep falling backwards........anyway's he only order 5 mg & its not strong enough --In about a week I have to see a specialist --I was wondering if I could take two pills instead of one 5 mg.........& will it affect my other three meds I have to take daily ??