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.
Suppress a dry, hacking cough. The most common kind of single-ingredient cough medicine is a suppressant, which acts on the cough center in the brain. Some suppressants contain the narcotic drug codeine or a codeine derivative, which are approved for over-the-counter sales in several states.