SULFUR HEXAFLUORIDE is a component of LUMASON® (sulfur hexafluoride lipid-type A microspheres). It is an ultrasound contrast agent indicated for use in the heart echocardiography and in ultrasonography of the liver and the urinary tract. The sulfur hexafluoride lipid microspheres are composed of SF6 gas in the core surrounded by an outer shell monolayer of phospholipids with palmitic acid as a stabilizer.

Perflutren is a diagnostic drug that is used for the contrast enhancement during echocardiographic. It consists of lipid-coated microspheres filled with octafluoropropane gas. Ultrasound waves make the microspheres resonate and reflect a strong signal to an ultrasound machine. This results in a difference of density between gas-filled bubbles and blood around them and improves contrast of resulting images. Perflutren is used in patients with suboptimal echocardiograms to opacify the left ventricular chamber and improve the delineation of the heart borders.

Urea 13C is a urea molecule radiolabelled with the non-radioactive element carbon-13. 13C-urea present in drugs which are intended for use in the qualitative detection of 13CO2 in whole blood specimens, collected after the ingestion of 13C-urea. Helicobacter pylori (H. pylori) organisms colonizing the lining of the human stomach, produce urease which converts 13C-urea into 13CO2 and ammonia (NH4+). In the presence of urease associated with gastric H. pylori, 13C-urea is decomposed to 13CO2 and ammonia NH4. The 13CO2 is absorbed in the blood, then exhaled in the breath. This results in an increase in the ratio of 13CO2 to 12CO2 in a TEST breath sample compared to a BASELINE sample.

Methacholine (trade name Provocholine) is a synthetic choline ester that acts as a muscarinic receptor agonist. Methacholine is primarily used to diagnose bronchial hyperreactivity, which is the hallmark of asthma and also occurs in chronic obstructive pulmonary disease. This is accomplished through the bronchial challenge test, or methacholine challenge, in which a subject inhales aerosolized methacholine, leading to bronchoconstriction.

Sincalide is a synthetically-prepared C-terminal octapeptide of naturally occurring hormone cholecystokinin. Sincalide causes gallbladder contraction and stimulates secretion of pancreatic enzymes, and this property of the drug is used in diagnostic purposes. It is discussed that the drug acts by binding and stimulating the CCK-A receptor which is expressed in the target tissues. FDA approved sincalide under the name KINEVAC.

Tropicamide (Mydriacyl) is an anticholinergic used as a mydriatic.Tropicamide belongs to the group of medicines called anti-muscarinics. Tropicamide blocks the receptors in the muscles of the eye (muscarinic receptors). These receptors are involved controlling the pupil size and the shape of the lens. By blocking these receptors, tropicamide produces dilatation of the pupil (mydriasis) and prevents the eye from accommodating for near vision (cycloplegia). Tropicamide is given as eye drops to dilate the pupil and relax the lens so that eye examinations can be carried out thoroughly.

Perflisobutane is an anesthetic agent.

Upenazime is a non-radioactive chemical precursor for diagnostic imaging.