You don't need a prescription for VSL#3. It's an over the counter (Without prescription) probiotic.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7190945/
Ask your Pharmacist if they carry it. Won't be on the shelf with the typical probiotics as it has to be refrigerated. I've wasted $ thousands on the brand name probiotics without any positive results - two weeks on this product (two capsules a day) and it was life changing for my Covid Gut.