Hi Mrsbexie - Polaramine can & does affect the respiratory system of newborns who's mothers have ingested the drug prior to birth. As your baby could be born at any time now this is why it's not encouraged to take.

I am more interested in the rash. Have you had a urine test? A blood test? Is there any mention of what this rash is?

Without knowing what the rash is it's not wise to treat it. You can use things in your bath - the name escapes me due to sleep deprivation but it will come to me.. Pinetarsal... !

But really find out what the rash is - that it's not a complication of pregnancy - treat the rash topically but personally I don't recommend antihistamines at this stage of pregnancy.