Medronic acid

MDP-25 (Kit for the Preparation of Technetium Tc 99m Medronate) may be used as a bone imaging agent to delineate areas of altered osteogenesis.

The recommended adult dose, after reconstitution with oxidant-free sodium pertechnetate Tc-99m, is 370 to 740 megabecquerels (10 to 20 millicuries [200 µCi/kg]) by slow intravenous injection over a period of 30 seconds. Optimum scanning time is 1 to 4 hours post-injection. To minimize the contribution of the bladder content to the image, the patient should void immediately before imaging is started. The patient dose should be measured by a suitable radioactivity calibration system immediately prior to administration. Parenteral drug products should be inspected visually for particulate matter and discoloration prior to administration. The solution should not be used if cloudy.

None known.

This class of compounds is known to complex cations such as calcium. Particular caution should be used with patients who have, or who may be predisposed to, hypocalcemia (i.e., alkalosis). The contents of the kit before preparation are not radioactive. However, after the sodium pertechnetate Tc-99m is added, adequate shielding of the final preparation must be maintained. Preliminary reports indicate impairment of brain images using Sodium Pertechnetate Tc 99m Injection which have been preceded by bone imaging using an agent containing stannous ions. The impairment may result in false-positive or false-negative brain images. It is recommended, where feasible, that brain imaging using Sodium Pertechnetate Tc 99m Injection precede bone imaging procedures. Alternatively, a brain imaging agent such as technetium Tc-99m pentetate may be employed.

Several cases of allergic dermatological reactions have been reported in association with the use of Technetium Tc 99m Medronate. Several reactions have also been reported in association with other radiopharmaceuticals of the diphosphonate class, particularly Technetium Tc 99m Medronate. These are usually hypersensitivity reactions characterized by itching, various skin rashes, hypotension, chills, nausea, fever, and vomiting. One death secondary to cardiac arrhythmia following the administration of Technetium Tc 99m Medronate has been reported. In addition, one case of cardiac arrest in a patient also undergoing pulmonary function testing one and one-half hours after the performance of a bone scan using Technetium Tc 99m Medronate has been reported.