"The U.S. Food and Drug Administration today approved Vizamyl (flutemetamol F 18 injection), a radioactive diagnostic drug for use with positron emission tomography (PET) imaging of the brain in adults being evaluated for Alzheimer's disease (AD) "...
Risk For Image Misinterpretation And Other Errors
Errors may occur in the Amyvid estimation of brain neuritic plaque density during image interpretation [see Clinical Studies].
Image interpretation should be performed independently of the patient's clinical information. The use of clinical information in the interpretation of Amyvid images has not been evaluated and may lead to errors. Other errors may be due to extensive brain atrophy that limits the ability to distinguish gray and white matter on the Amyvid scan as well as motion artifacts that distort the image.
Amyvid scan results are indicative of the brain neuritic amyloid plaque content only at the time of image acquisition and a negative scan result does not preclude the development of brain amyloid in the future.
Amyvid, similar to other radiopharmaceuticals, contributes to a patient's overall long-term cumulative radiation exposure. Long-term cumulative radiation exposure is associated with an increased risk of cancer. Ensure safe handling to protect patients and health care workers from unintentional radiation exposure [see DOSAGE AND ADMINISTRATION].
Carcinogenesis, Mutagenesis, Impairment Of Fertility
Animal studies to assess the carcinogenicity or reproductive toxicity potentials of Amyvid have not been conducted.
In an in vitro bacterial reverse mutation assay (Ames test), increases in the number of revertant colonies were observed in 2 of the 5 strains exposed to 19F-AV-45, the non-radioactive form of florbetapir F 18. In a chromosomal aberration in vitro study with cultured human peripheral lymphocytes, 19F-AV-45 did not increase the percentage of cells with structural aberrations with 3-hour exposure with or without activation; however, 22-hour exposure produced a statistically significant increase in structural aberrations at all tested concentrations. Potential in vivo genotoxicity of 19FAV-45 was evaluated in a rat micronucleus study. In this assay, 19F-AV-45 did not increase the number of micronucleated polychromatic erythrocytes at the highest achievable dose level, 372 μg/kg/day, when given twice daily for 3 consecutive days.
Use In Specific Populations
Pregnancy Category C
It is not known whether Amyvid can affect reproductive capacity or cause fetal harm when administered to a pregnant woman. Animal reproduction studies have not been conducted with Amyvid. Amyvid should be administered to a pregnant woman only if clearly needed.
All radiopharmaceuticals, including Amyvid, have a potential to cause fetal harm. The likelihood of fetal harm depends on the stage of fetal development and the magnitude of the radiopharmaceutical dose. Assess pregnancy status before administering Amyvid to a female of reproductive potential.
It is not known whether Amyvid is excreted in human milk. Because many drugs are excreted into human milk and because of the potential for radiation exposure to nursing infants from Amyvid, avoid use of the drug in a breastfeeding mother or have the mother temporarily interrupt breastfeeding for 24 hours ( > 10 half-lives of radioactive decay for the F 18 isotope) after exposure to Amyvid. If breastfeeding is interrupted, the patient should pump and discard her breast milk and use alternate infant nutrition sources (e.g., stored breast milk or infant formula) for 24 hours after administration of the drug.
Amyvid is not indicated for use in pediatric patients.
Of 496 patients in completed clinical studies of Amyvid, 307 patients were ≥ 65 years old (203 patients were over 75 years of age). No overall differences in safety or effectiveness were observed between these subjects and younger subjects.
Last reviewed on RxList: 1/23/2014
This monograph has been modified to include the generic and brand name in many instances.
Additional Amyvid Information
Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.
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