Gallium Citrate Ga-67

Description

DESCRIPTION Gallium Citrate Ga 67 Injection is supplied in a 10 milliliter vial as an isotonic, sterile, non-pyrogenic solution. Each milliliter of the isotonic solution contains 74 megabecquerels (2 millicuries) of gallium Ga-67 on the calibration date as a complex formed from 8.3 nanograms gallium chloride Ga-67, 1.9 milligrams of sodium citrate dihydrate, 7.8 milligrams of sodium chloride and 0.9 percent benzyl alcohol (v/v) as a preservative. The pH is adjusted to between 5.5 to 8.0 with hydrochloric acid and/or sodium hydroxide solution. Gallium Ga-67, with a half-life of 78.26 hours, is cyclotron produced by the proton irradiation of enriched zinc. At the time of calibration the drug contains no more than 0.02% gallium Ga-66 and no more than 0.2% zinc Zn-65. The concentration of each radionuclidic impurity changes with time. At expiration, the drug contains no more than 0.001% gallium Ga-66 and no more than 1.0% zinc Zn-65. No carrier has been added. Gallium citrate has the following chemical structure: P hysical Characteristics Gallium Ga-67 with a physical half-life of 78.26 hours 1 decays by electron capture to stable zinc Zn-67. Photons that are useful for imaging studies are listed in Table 1. Table 1. Principal Radiation Emission Data Radiation Mean Percent Per Disintegration Energy (keV) Gamma-2 Gamma-3 Gamma-4 Gamma-5 Gamma-6 Gamma-7 2.9 35.7 19.7 2.2 16.0 4.5 91.3 93.3 184.6 209.0 300.2 393.5 1 Kocher, D.C., Radioactive Decay Data Tables, Health and Safety Research Division, National Technical Information Service, DOE/TIC-11026, pg. 80, 1981. E xternal Radiation The specific gamma ray constant for gallium Ga-67 is 1.6 R/mCi-hour at 1 cm. The first half-value thickness of lead (Pb) is 0.066 cm. A range of values for the relative attenuation of the radiation emitted by this radionuclide that results from interposition of various thicknesses of lead is shown in Table 2. For example, the use of 1.2 cm of lead will decrease the radiation exposure by a...

What Is Gallium Citrate Ga-67 Used For?

INDICATIONS AND USAGE Gallium Citrate Ga 67 Injection may be useful to demonstrate the presence and extent of Hodgkin's disease, lymphoma, and bronchogenic carcinoma. Positive gallium Ga-67 uptake in the absence of prior symptoms warrants follow-up as an indication of a potential disease state. Gallium Citrate Ga 67 Injection may be useful as an aid in detecting some acute inflammatory lesions.

Dosage and Administration

DOSAGE AND ADMINISTRATION The recommended adult (70 kg) dose of Gallium Citrate Ga 67 Injection is 74 to 185 megabecquerels (2 to 5 millicuries). Gallium Citrate Ga 67 Injection is intended for intravenous administration only. Approximately 10 percent of the administered dose is excreted in the feces during the first week after injection. Daily laxatives and/or enemas are recommended from the day of injection until the final images are obtained in order to cleanse the bowel of radioactive material and minimize the possibility of false positive studies. Studies indicate the optimal tumor to background concentration ratios are often obtained 48 hours post injection. However, considerable biological variability may occur in individuals and acceptable images may be obtained as early as 6 hours and as late as 120 hours after injection. 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. Do not use if contents are turbid. Instructions for the handling of Gallium Citrate Ga 67: Waterproof gloves should be used during the entire handling and administration procedure. Using proper shielding, the vial containing the Gallium Citrate Ga 67 should be visually inspected to ensure that it is free of particulate matter and discoloration prior to use. Maintain adequate shielding during the life of the product and use a sterile, shielded syringe for withdrawing and injecting the preparation. R adiation Dosimetry The estimated absorbed radiation doses 2 from an intravenous injection of 185 megabecquerels (5 millicuries) of Gallium Citrate Ga 67 are shown in Table 4. Table 4. Absorbed Radiation Doses Tissue mGy/ 185MBq rads/ 5mCi Whole Body Skeleton Liver Bone Marrow Spleen Kidney Ovaries Testes Gastrointestinal Tract Stomach Small Intestine Upper Large Intestine Lower Large Intestine 13.0 22.0 23.0 29.0 26.5 20.5 14.0 12.0 11.0 18.0 28.0 45.0 1.30 2.20 2.30 2.90 2.65 2.05 1.40 1.20 1.10 1.80 2.80 4.50 2 MIRD Dose Estimate Report No. 2, J. Nucl. Med. 14; 755-6 (1973).

Side Effects (Adverse Reactions)

ADVERSE REACTIONS Rare occurrences of allergic reactions, skin rash and nausea have been reported in association with Gallium Citrate Ga 67 use.

Contraindications

CONTRAINDICATIONS None.

Pregnancy and Breastfeeding

Pregnancy Animal reproductive studies have not been conducted with Gallium Citrate Ga 67. It is also not known whether Gallium Citrate Ga 67 can cause fetal harm when administered to a pregnant woman or can affect reproduction capacity. Gallium Citrate Ga 67 should be given to a pregnant woman only if clearly needed. Ideally, examinations using radiopharmaceuticals, especially those elective in nature of women of childbearing capability, should be performed during the first few (approximately ten) days following the onset of menses.

Nursing Mothers This drug is known to be excreted in human milk during lactation, therefore, formula feedings should be substituted for breast feedings.

How Supplied

HOW SUPPLIED Catalog Number 180. Gallium Citrate Ga 67 Injection is supplied sterile and non-pyrogenic for intravenous use. Each milliliter contains 74 megabecquerels (2 millicuries) of gallium Ga-67 on the calibration date, as a complex formed from 8.3 nanograms gallium chloride Ga-67, 1.9 milligrams of sodium citrate dihydrate, 7.8 milligrams of sodium chloride, and 0.9 percent benzyl alcohol (v/v) as a preservative. The pH is adjusted to between 5.5 to 8.0 with hydrochloric acid and/or sodium hydroxide solution. Gallium Citrate Ga 67 Injection is available in vials containing the following amounts on the calibration date. Catalog No. N180G0 222 megabecquerels (6 mCi) NDC 69945-180-06 N180M0 444 megabecquerels (12 mCi) NDC 69945-180-12 Storage and Handling The contents of the vial are radioactive, and adequate shielding and handling precautions must be maintained. Store at controlled room temperature 20° to 25°C (68° to 77°F) [see USP]. Storage and disposal of Gallium Citrate Ga 67 Injection should be controlled in a manner that is in compliance with the appropriate regulations of the government agency authorized to license the use of this radionuclide. ©2022 Curium US LLC. Curium TM and the Curium logo are trademarks of a Curium company. Manufactured by: Curium US LLC Maryland Heights, MO 63043 Made in USA A180I0 R07/2022 Curium logo