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.
For a chesty cough with phlegm, expectorants can help you 'cough it up' and ease the cough. An expectorant is a medicine that thins mucus so you can cough it up more easily. The ingredients you will typically see in cough expectorant are guaiphenesin, ammonium chloride, squill, sodium citrate and ipecacuanha. These medicines are unlikely to cause side effects for most people.