Talk to General Physician on Medicine Alternate For Salazopyrin

I am under treatment for Rheumatoid arthritis in Spain. I was prescribed Salazopyrin 500 mg by doctor here. But unfortunately this medicine is out of stock because Pfizer has stopped producing this medicine and there is no alternate here. In Pakistan Feroz and sons pharma produces Salazodine with same molecule (Sulfasalazine). I just want to make sure is that the good alternate to Salazopyrin or is there any other good alternate to this medicine?