How can a get a prfescription for Cystagon filled? ## Hello, I'm not quite sure what information you're seeking, but your best bet for getting a prescription filled would be to visit your local pharmacy. If you don't know where your nearest pharmacy is located, listed below is a pharmacy-locator that uses your zip code to find nearby pharmacies within a given mile range: pharmacylocator.unarxcard.com Phone numbers and addresses are included in the list after you verify your zip code. I hope this helps!