Psoriderm Emultion Bath Additive

Hi All. This is my first time here.At the grand old age of 68 I have been diagnosed with Psoriasis. My GP has told me that it is very unusual for someone of my age to suddenly suffer from it. He has prescribed Dafobet and Diprobase Cream. They don't seem to be much help.The itching has become unbearable. He has now prescribed Psoriderm Emulsion Bath Additive to help with the itching. I have had a look back to see if anyone on here has used this stuff.I don't see any mention of it. Is there anyone who could let me know if they have used it before? He also said to use it every other day.I have used it a couple of times with not much success.