Florbetapir

12.1 Mechanism of Action Florbetapir F 18 binds to amyloid beta plaques and the F 18 isotope produces a positron signal that is detected by a PET scanner. In in vitro binding studies using postmortem human brain homogenates containing amyloid beta plaques, the dissociation constant (Kd) for florbetapir was 3.7 ± 0.3 nM. The binding of florbetapir F 18 to amyloid beta aggregates was demonstrated in postmortem human brain sections using autoradiographic methods, thioflavin S and traditional silver staining correlation studies as well as immunohistochemistry (monoclonal antibody to amyloid beta) correlation studies. Florbetapir binding to tau protein and a battery of neuroreceptors was not detected in in vitro studies.

1 INDICATIONS AND USAGE AMYVID is indicated for positron emission tomography (PET) of the brain to estimate amyloid beta neuritic plaque density in adults with cognitive impairment for: Evaluation of Alzheimer's disease (AD) and other causes of cognitive decline Selection of patients who are indicated for amyloid beta-directed therapy as described in the prescribing information of the therapeutic products AMYVID is a radioactive diagnostic drug indicated for positron emission tomography (PET) of the brain to estimate amyloid beta neuritic plaque density in adults with cognitive impairment for: Evaluation of Alzheimer's disease (AD) and other causes of cognitive decline Selection of patients who are indicated for amyloid beta-directed therapy as described in the prescribing information of the therapeutic products ( 1 )

2 DOSAGE AND ADMINISTRATION The recommended amount of radioactivity is 370 MBq (10 mCi) administered as a single intravenous bolus in a total volume of up to 10 mL. ( 2.2 ) Follow the injection with an intravenous flush of approximately 10 mL of 0.9% sodium chloride injection. ( 2.2 ) Obtain 10-minute PET images starting approximately 30 minutes to 50 minutes after drug administration. ( 2.3 ) See full prescribing information for image interpretation and radiation dosimetry. ( 2.4 , 2.5 ) 2.1 Radiation Safety - Drug Handling Handle AMYVID with appropriate safety measures to minimize radiation exposure during administration [see Warnings and Precautions ( 5.2 )] . Use waterproof gloves and effective radiation shielding, including syringe shields when handling and administering AMYVID. Radiopharmaceuticals, including AMYVID, should be used by or under the control of healthcare providers who are qualified by specific training and experience in the safe use and handling of radionuclides, and whose experience and training have been approved by the appropriate governmental agency authorized to license the use of radionuclides. 2.2 Recommended Dosage and Administration Instructions Recommended Dosage The recommended amount of radioactivity of AMYVID is 370 MBq (10 mCi) in a total volume of up to 10 mL, administered as a single intravenous bolus. The maximum mass dose is 50 mcg. Follow the injection with an intravenous flush of approximately 10 mL of 0.9% sodium chloride injection. Patient Preparation Instruct patients to hydrate before and after AMYVID administration and to void following AMYVID administration before imaging and frequently thereafter [see Warnings and Precautions ( 5.2 )] . Administration Use aseptic technique and radiation shielding when withdrawing and administering AMYVID. Visually inspect AMYVID for particulate matter and discoloration prior to administration. Do not use AMYVID if it contains particulate matter or if it is discolored. Do not dilute AMYVID. Assay the dose in a dose calibrator prior to administration. Inject AMYVID through a short intravenous catheter (approximately 1.5 inches or less) to minimize the potential for adsorption of the drug to the catheter. Portions of the AMYVID dose may adhere to longer catheters. Dispose of unused product in a safe manner in compliance with applicable regulations. 2.3 Image Acquisition Instructions Position the patient supine with the head positioned to center the brain, including the cerebellum, in the PET scanner field of view. Tape or other flexible head restraints may be employed to reduce head movement. Acquire 10-minute PET images starting 30 minutes to 50 minutes after AMYVID administration. Image reconstruction should include attenuation correction with resulting transaxial pixel sizes between 2 mm and 3 mm. 2.4 Image Display and Interpretation Image Display Display images in the transaxial orientation with access as needed to the sagittal and coronal planes. In reviewing the images, include all transaxial slices of the brain using a black-white scale set to the maximum intensity of all the brain pixels. Initially locate the brain slice with the highest levels of image contrast (highest signal intensity) and adjust the contrast appropriately. Start image interpretation by displaying slices sequentially from the bottom of the brain to the top. Periodically refer to the sagittal and coronal plane image display as needed to better define the signal intensity and to ensure that the entire brain is displayed. Visual Assessment AMYVID images should be interpreted only by readers who successfully complete the training program provided by the manufacturer. Perform image interpretation independently of the patient's clinical features, relying on the recognition of unique image features. Interpret AMYVID images based upon the distribution of signal intensity within the cerebral cortex by comparing the signal intensity in the cortical gray matter and the adjacent white matter. The signal intensity in the cerebellum does not contribute to the scan interpretation. For example, a positive scan may show retained cerebellar gray-white contrast even when the cortical gray-white contrast is lost. Some scans may be difficult to interpret due to image noise, atrophy with a thinned cortical ribbon, or image blur. For cases where there is uncertainty as to the location of cortical signal, use co-registered anatomical imaging to improve localization of signal [see Warnings and Precautions ( 5.1 )] . Negative AMYVID Scan Negative scans show more signal in white matter than in adjacent cortical gray matter, creating clear gray-white contrast. A negative scan indicates sparse to no amyloid beta neuritic plaques. In patients being evaluated for AD and other causes of cognitive decline who have not been treated with amyloid beta-directed therapy, a negative scan is inconsistent with a neuropathological diagnosis of AD at the time of image acquisition and reduces th

6 ADVERSE REACTIONS Most common adverse reactions (incidence ≥ 0.4%) were headache, musculoskeletal pain, increased blood pressure, nausea, fatigue, injection site reaction, anxiety, back pain, claustrophobia, dizziness, feeling cold, insomnia, and neck pain. ( 6.1 ) To report SUSPECTED ADVERSE REACTIONS, contact Eli Lilly and Company at 1-800-545-5979 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch . 6.1 Clinical Trials Experience Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in clinical practice. The safety of AMYVID was evaluated in 555 adult subjects who received AMYVID by intravenous injection in clinical trials. Table 2 shows adverse reactions reported in ≥ 0.4% of subjects from the clinical trials. Table 2: Adverse Reactions Reported in ≥ 0.4% of Adult Subjects Who Received AMYVID in Clinical Trials a Includes the terms blood pressure increased and hypertension. b Includes the terms injection site hemorrhage, injection site irritation, and injection site pain. c Includes the terms feeling cold and chills. Adverse Reaction AMYVID N=555 % Headache 1.8 Musculoskeletal pain 0.7 Blood pressure increased a 0.7 Nausea 0.7 Fatigue 0.5 Injection site reaction b 0.5 Anxiety 0.4 Back pain 0.4 Claustrophobia 0.4 Dizziness 0.4 Feeling cold c 0.4 Insomnia 0.4 Neck pain 0.4 Adverse reactions that occurred in <0.4% of subjects included infusion site rash, dysgeusia, pruritus, urticaria, and flushing.