How Can Eye Swelling Caused By Painkillers Be Treated?

Hi, i'm a 24years old girl. Recently by a MRI scan they found out one of the discs in my spine has prolapsed. As a result i get pain in my right leg which stops me from sitting and doing my studies. Doctor gave Zerodol 100mg, saying its a very light pain killer. Because when I take pain killers, I get my eyes swollen. Dr. said it wan't happen to this drug. But as usual i got a aswelling in my eyes. why?