If your T isn't allowed to write prescriptions, the procedure is for you to tell the Pdoc the recommendation and the Pdoc calls your T for collaboration on the meds. I wouldn't be worried at all about telling the pdoc as they generally don't care a flip about mental stuff, don't want to talk about it very much with you, and will prescribed what your therapist recommends.
If you go to a mental health clinic to see your T, the clinic usually has a special nurse that writes all prescriptions for bi-polar, and such.