In obstetrics, the distance between the midline superior point of the sacrum and the upper margin of the symphysis pubis. It is the anteroposterior diameter of the pelvic inlet, estimated by subtracting 1.5 to 2 cm from the measurement of the diagonal conjugate.
1 Promethazine-codeine cough syrup, a medication that contains codeine, an opioid that acts as a cough suppressant and can also produce relaxation and euphoria when consumed at a higher-than-prescribed dose. 2  It also contains promethazine HCl, an antihistamine that additionally acts as a sedative.
, former paramedic. Most likely that is promethazine, frequently known by the trade name Phenergan. It's a common antiemetic (anti-nausea and anti-vomiting). It used to be used even more commonly before drugs like ondansetron (Zofran) came on the market, which have fewer side effects like sedation. Promethazine might still be a preferred agent in some situations including motion sickness, pregnancy, and when sleep is desirable.