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.
The stronger NyQuil Severe has all those ingredients, but tosses in the nasal decongestant phenylephrine. NyQuil Cough omits the acetaminophen but has the dextromethorphan and doxylamine succinate to cut down on your coughing.