Treating scalp psoriasis while feeding?

Have any of you used T/Gel or T/Sal shampoos while feeding? I have terrible scalp psoriasis and am wondering if these are fine to use... I've used them before I was pregnant and would like to use them again. I was formerly using a prescription shampoo but I lost my health insurance and can't afford it anymore. I need to go to the pharmacy later and will ask the pharmacist while I am there but I am just curious now. Other milder shampoos like Head and Shoulders or Selsun Blue, which I know are safe during feeding, don't work at all for me. My scalp is driving me crazy!!