Technetium Tc 99m Tetrofosmin Injection »Technetium Tc 99m Tetrofosmin Injection is a sterile aqueous solution,suitable for intravenous injection,that contains 99mTc in the form of a complex of tetrofosmin.It contains not less than 90.0percent and not more than 110.0percent of the labeled amount of 99mTc as tetrofosmin complex expressed in MBq (or mCi)per mLat the date and time indicated in the labeling.It may contain reducing agents,stabilizers,and buffers.It contains no antimicrobial agents.Other chemical forms of radioactivity do not exceed 10.0percent of the total. Packaging and storage— Preserve in adequately shielded single-dose or in multiple-dose containers.Protect from light.Store at a temperature not exceeding 25. Labeling— Label it to include the following,in addition to the information specified for Labelingunder Injections á1ñ:the time and date of calibration;the amount of 99mTc as labeled tetrofosmin expressed as total MBq (or mCi)and the concentration as megabecquerels per mL(or as mCi per mL)on the date and time of calibration;the expiration date and time;and a statement,“Caution—Radioactive Material.”The labeling indicates that in making dosage calculations,correction is to be made for radioactive decay,and also indicates that the radioactive half-life of 99mTc is 6.0hours. USP Reference standards á11ñ USP Endotoxin RS. Bacterial endotoxins á85ñ The limit of endotoxin content is not more than 175/VUSP Endotoxin Unit per mLof the Injection,when compared with USP Endotoxin RS,in which Vis the maximum recommended total dose,in mL,at the expiration date or time. pHá791ñ: between 8.3and 9.1. Radiochemical purity— To determine the amount of free technetium,apply a 10-to 20-µLvolume of Injection about 3.0cm from the bottom of a 2-×20-cm instant thin-layer chromatographic silica gel strip (see Chromatography á621ñ).Immediately develop the chromatogram by ascending chromatography to a height of 15cm using a solvent system consisting of a mixture of acetone and dichloromethane (35:65).Allow the chromatogram to air-dry.Determine the radioactivity distribution of the chromatogram by scanning with a suitable radiation detector.The RFvalue of the technetium Tc 99m tetrofosmin spot is approximately 0.5:the sum of radioactivity at the solvent front (unbound pertechnetate)and the origin (reduced hydrolyzed technetium and hydrophilic impurities)is not more than 10%. Other requirements— It meets the requirements for Radionuclide identificationand Radionuclidic purityunder Sodium Pertechnetate Tc 99m Injection.It meets also the requirements under Injections á1ñ,except that it may be distributed or dispensed prior to completion of the test for Sterility,the latter test being started on the date of manufacture. Assay for radioactivity á821ñ Using a suitable counting assembly (see Selection of a Counting Assembly),determine the radioactivity,in MBq (µCi)per mL,of the Injection by use of a calibrated system. Auxiliary Information— Staff Liaison:Andrzej Wilk,Ph.D.,Senior Scientific Associate Expert Committee:(RMI)Radiopharmaceuticals and Medical Imaging Agents USP28–NF23Page 1865 Phone Number:1-301-816-8305