Does PRP cause hair to shed more?

No, prp shouldn't cause an in crease in hair shedding. I do recommend combining prp with progesterone to improve results. It will take up to 6 months to see improvement. I recommend getting a formal evaluation with a hair loss expert. Best, Dr. Emer

Since your PRP therapy was 6 months ago the current shedding should not be related.Perhaps it is time for another treatment or you need to be on Finasteride and/or Minoxidil.I would recommend a consultation with a Dermatologist or experienced Hair Restoration surgeon to develop an appropriate treatment plan.

PRP can result in some
initial shedding, as it functions to convert some resting hairs into the Anagan
phase. Not all PRP is equal and if your doctor does not remove the white blood
cells from the mixture, the shedding can occur from the inflammation. Some
doctors believe that PRP actually causes a good inflammation and that the
growth factors that are released stimulate regrowth and the growth phase. If micro
needling is involved with the PRP, shredding can also occur. However if
properly performed with the proper PRP mixture being injected into the scalp,
then you can expect the hair to regrow stronger after the shedding phase. 

This sounds atypical, PRP should not cause hairloss. I would recommend an evaluation with a reputable provider.