Hello Doctor,pl.help me.I am 69,suffering from Osteourtharities on both of my knees for many years.and also gout on my lefl knee.Since last 6 mnts,I am feeling severe pain on my right knee,for which I can't walk properly,after standing from chair,I can't walk and have to wait for a while.So long I have takien pain killers like Zerodol sr, ACE-Proxyvon,Emanzen-D,etc.So long I am taking pain killer,I am feeling better.Now I have been pescribed Zerodol SP. Pl.advice me,which is the right medicine for me to det relief from my severe pain and how long I have to continue the pescribed medicine.