Sinografin® (diatrizoate meglumine and iodipamide meglumine) is a contrast agent indicated for use in hysterosalpingography. Intrauterine used contrast agents have few known pharmacological effects. Most of the medium within the uterine cavity is discharged immediately after finishing of the procedure and the contrast medium retained is completely absorbed.

Thorotrast is an obsolete contrast medium containing a colloidal suspension of thorium dioxide. Contrast agents based on thorium have been abandoned since they turned out to be carcinogenic.

Viscosity is measured in centipoise (cP). The viscosity of water at 20° C is approximately 1 cP. Viscosity depends on temperature, size and shape of the dissolved particle.
The viscosity of contrast agents is an important factor in diagnostic imaging procedures like angiography and other studies where the injection rate can be of critical importance. Warming the contrast agent to body temperature may achieve higher flow rates. Contrast media are approximately twice as viscous at 20° C as at body temperature.