Fetroja

1 INDICATIONS AND USAGE FETROJA is a cephalosporin antibacterial indicated in patients 18 years of age or older for the treatment of the following infections caused by susceptible Gram-negative microorganisms: Complicated Urinary Tract Infections (cUTI), including Pyelonephritis ( 1.1 ) Hospital-acquired Bacterial Pneumonia and Ventilator-associated Bacterial Pneumonia (HABP/VABP) ( 1.2 ) To reduce the development of drug-resistant bacteria and maintain the effectiveness of FETROJA and other antibacterial drugs, FETROJA should be used only to treat or prevent infections that are proven or strongly suspected to be caused by bacteria. ( 1.3 ) 1.1 Complicated Urinary Tract Infections (cUTIs), Including Pyelonephritis FETROJA ® is indicated in patients 18 years of age or older for the treatment of complicated urinary tract infections (cUTIs), including pyelonephritis caused by the following susceptible Gram-negative microorganisms: Escherichia coli , Klebsiella pneumoniae , Proteus mirabilis , Pseudomonas aeruginosa , and Enterobacter cloacae complex [see Clinical Studies (14.1) ] . 1.2 Hospital-acquired Bacterial Pneumonia and Ventilator-associated Bacterial Pneumonia (HABP/VABP) FETROJA is indicated in patients 18 years of age or older for the treatment of hospital-acquired bacterial pneumonia and ventilator-associated bacterial pneumonia, caused by the following susceptible Gram-negative microorganisms: Acinetobacter baumannii complex, Escherichia coli , Enterobacter cloacae complex, Klebsiella pneumoniae , Pseudomonas aeruginosa , and Serratia marcescens [see Clinical Studies (14.2) ]. 1.3 Usage To reduce the development of drug-resistant bacteria and maintain the effectiveness of FETROJA and other antibacterial drugs, FETROJA should be used only to treat or prevent infections that are proven or strongly suspected to be caused by susceptible bacteria. When culture and susceptibility information are available, they should be considered in selecting or modifying antibacterial therapy. In the absence of such data, local epidemiology and susceptibility patterns may contribute to the empiric selection of therapy.

2 DOSAGE AND ADMINISTRATION Administer 2 grams of FETROJA for injection every 8 hours by intravenous (IV) infusion over 3 hours in patients with creatinine clearance (CLcr) 60 to 119 mL/min. ( 2.1 ) Dose adjustments are required for patients with CLcr less than 60 mL/min, (including patients receiving intermittent hemodialysis (HD) or continuous renal replacement therapy (CRRT)), and for patients with CLcr 120 mL/min or greater. ( 2.2 ) See full prescribing information for instructions on preparation of FETROJA doses. ( 2.3 ) See full prescribing information for drug compatibilities. ( 2.4 ) 2.1 Recommended Dosage The recommended dosage of FETROJA is 2 grams administered every 8 hours by intravenous (IV) infusion over 3 hours in adults with a creatinine clearance (CLcr) of 60 to 119 mL/min. Dosage adjustment of FETROJA is recommended for patients with CLcr less than 60 mL/min, including patients receiving intermittent hemodialysis (HD) or continuous renal replacement therapy (CRRT), and for patients with CLcr 120 mL/min or greater [see Dosage and Administration (2.2) ]. The recommended duration of treatment with FETROJA is 7 to 14 days. The duration of therapy should be guided by the patient's clinical status. 2.2 Dosage Adjustments in Patients with CLcr Less Than 60 mL/min (Including Patients Undergoing Intermittent HD or CRRT), and CLcr 120 mL/min or Greater Dosage Adjustments in Patients with CLcr Less Than 60 mL/min Including Patients Receiving Intermittent HD Dosage adjustment of FETROJA is recommended in patients with CLcr less than 60 mL/min (Table 1). For patients undergoing intermittent HD, start the dosing of FETROJA immediately after the completion of HD. For patients with fluctuating renal function, monitor CLcr and adjust dosage accordingly. Table 1 Recommended Dosage of FETROJA for Patients with CLcr Less Than 60 mL/min Including Patients Receiving Intermittent HD Estimated Creatinine Clearance (CLcr) CLcr = creatinine clearance estimated by Cockcroft-Gault equation. Dose Frequency Infusion Time HD = hemodialysis. CLcr 30 to 59 mL/min 1.5 grams Every 8 hours 3 hours CLcr 15 to 29 mL/min 1 gram Every 8 hours 3 hours CLcr less than 15 mL/min, with or without intermittent HD Cefiderocol is removed by HD; administer FETROJA immediately after HD for patients receiving intermittent HD. 0.75 grams Every 12 hours 3 hours Dosage Adjustments in Patients Receiving CRRT For patients receiving CRRT, including continuous venovenous hemofiltration (CVVH), continuous venovenous hemodialysis (CVVHD), and continuous venovenous hemodiafiltration (CVVHDF), the dosage of FETROJA should be based on the effluent flow rate in CRRT (see Table 2 ). These recommendations are intended to provide initial dosing in patients receiving CRRT. Dosing regimens may need to be tailored based on residual renal function and patient's clinical status [see Use in Specific Populations (8.6) ] . Table 2 Recommended Dosage of FETROJA for Patients Receiving CRRT Effluent Flow Rate Ultrafiltrate flow rate for CVVH, dialysis flow rate for CVVHD, ultrafiltrate flow rate plus dialysis flow rate for CVVHDF. Recommended Dosage of FETROJA CRRT = continuous renal replacement therapy. 2 L/hr or less 1.5 grams every 12 hours 2.1 to 3 L/hr 2 grams every 12 hours 3.1 to 4 L/hr 1.5 grams every 8 hours 4.1 L/hr or greater 2 grams every 8 hours Dosage Adjustments in Patients with CLcr 120 mL/min or Greater For patients with CLcr greater than or equal to 120 mL/min, FETROJA 2 grams administered every 6 hours by IV infusion over 3 hours is recommended [see Use in Specific Populations (8.6) ] . 2.3 Preparation of FETROJA Solution for Administration FETROJA is supplied as a sterile, lyophilized powder that must be reconstituted and subsequently diluted using aseptic technique prior to intravenous infusion. Preparation of Doses Reconstitute the powder for injection in the FETROJA vial with 10 mL of either 0.9% sodium chloride injection, USP or 5% dextrose injection, USP and gently shake to dissolve. Allow the vial(s) to stand until the foaming generated on the surface has disappeared (typically within 2 minutes). The reconstituted solution will have a final volume of approximately 11.2 mL and concentration of 0.089 gram/mL. The reconstituted solution is for intravenous infusion only after dilution in an appropriate infusion solution. To prepare the required doses, withdraw the appropriate volume of reconstituted solution from the vial according to Table 3 below. Add the withdrawn volume to a 100 mL infusion bag containing 0.9% sodium chloride injection, USP or 5% dextrose injection, USP [see Dosage and Administration (2.4) ] . Parenteral drug products should be inspected visually for particulate matter and discoloration prior to administration, whenever solution and container permit. FETROJA infusions are clear, colorless solutions. Discard any unused FETROJA solution in the vial (see Table 3 ). Table 3 Preparation of FETROJA Doses FETROJA Dose Number of 1-gram FETROJA Vials to be Reconstituted Volume to Withdraw from Reconstituted Vial(s) Total Volume of FETROJA Reconstituted Solution for Further Dilution into a 100 mL Infusion Bag 2 grams 2 vials 11.2 mL (entire contents) of each vial 22.4 mL 1.5 grams 2 vials 11.2 mL (entire contents) of first vial AND 5.6 mL from second vial 16.8 mL 1 gram 1 vial 11.2 mL (entire contents) 11.2 mL 0.75 gram 1 vial 8.4 mL 8.4 mL 2.4 Drug Compatibility FETROJA solution for administration is compatible with: 0.9% sodium chloride injection, USP 5% dextrose injection, USP The compatibility of FETROJA solution for administration with solutions containing other drugs or other diluents has not been established. 2.5 Storage of Reconstituted Solutions Reconstituted FETROJA Upon reconstitution with the appropriate diluent, the reconstituted FETROJA solution in the vial should be immediately transferred and diluted into the infusion bag. Reconstituted FETROJA can be stored for up to 1 hour at room temperature in the vial. Discard any unused reconstituted solution. Diluted FETROJA Infusion Solution The diluted FETROJA infusion solution in the infusion bag is stable for up to 6 hours at room temperature. The diluted FETROJA infusion solution in the infusion bag may also be refrigerated at 2°C to 8°C (36°F to 46°F) for up to 24 hours, protected from light; and then the infusion should be completed within 6 hours at room temperature.

4 CONTRAINDICATIONS FETROJA is contraindicated in patients with a known history of severe hypersensitivity to cefiderocol or other beta-lactam antibacterial drugs, or any other component of FETROJA [see Warnings and Precautions (5.2) and Adverse Reactions (6.1) ] . FETROJA is contraindicated in patients with a known history of severe hypersensitivity to cefiderocol and other beta-lactam antibacterial drugs or other components of FETROJA. ( 4 )

5 WARNINGS AND PRECAUTIONS Increase in All-Cause Mortality in Patients with Carbapenem-Resistant Gram-Negative Bacterial Infections: An increase in all-cause mortality was observed in FETROJA-treated patients compared to those treated with best available therapy (BAT). Closely monitor the clinical response to therapy in patients with cUTI and HABP/VABP. ( 5.1 ) Hypersensitivity Reactions: Serious and occasionally fatal hypersensitivity (anaphylactic) reactions have been reported in patients receiving beta-lactam antibacterial drugs. Hypersensitivity was observed with FETROJA. Cross-hypersensitivity may occur in patients with a history of penicillin allergy. If an allergic reaction occurs, discontinue FETROJA. ( 5.2 ) Clostridioides difficile -associated Diarrhea (CDAD): CDAD has been reported with nearly all systemic antibacterial agents, including FETROJA. Evaluate if diarrhea occurs. ( 5.3 ) Seizures and Other Central Nervous System (CNS) Adverse Reactions: CNS adverse reactions such as seizures have been reported with FETROJA. If focal tremors, myoclonus, or seizures occur, evaluate patients to determine whether FETROJA should be discontinued. ( 5.4 ) 5.1 Increase in All-Cause Mortality in Patients with Carbapenem-Resistant Gram-Negative Bacterial Infections An increase in all-cause mortality was observed in patients treated with FETROJA as compared to best available therapy (BAT) in a multinational, randomized, open-label trial in critically ill patients with carbapenem-resistant Gram-negative bacterial infections (NCT02714595). Patients with nosocomial pneumonia, bloodstream infections, sepsis, or cUTI were included in the trial. BAT regimens varied according to local practices and consisted of 1 to 3 antibacterial drugs with activity against Gram-negative bacteria. Most of the BAT regimens contained colistin. The increase in all-cause mortality occurred in patients treated for nosocomial pneumonia, bloodstream infections, or sepsis. The 28-Day all-cause mortality was higher in patients treated with FETROJA than in patients treated with BAT [25/101 (24.8%) vs. 9/49 (18.4%), treatment difference 6.4%, 95% CI (-8.6, 19.2)]. All-cause mortality remained higher in patients treated with FETROJA than in patients treated with BAT through Day 49 [34/101 (33.7%) vs. 10/49 (20.4%), treatment difference 13.3%, 95% CI (-2.5, 26.9)]. Generally, deaths were in patients with infections caused by Gram-negative organisms, including non-fermenters such as Acinetobacter baumannii complex, Stenotrophomonas maltophilia , and Pseudomonas aeruginosa , and were the result of worsening or complications of infection, or underlying comorbidities. The cause of the increase in mortality has not been established. Closely monitor the clinical response to therapy in patients with cUTI and HABP/VABP. 5.2 Hypersensitivity Reactions Serious and occasionally fatal hypersensitivity (anaphylactic) reactions and serious skin reactions have been reported in patients receiving beta-lactam antibacterial drugs. Hypersensitivity was observed in FETROJA-treated patients in clinical trials [see Adverse Reactions (6.1) ] . These reactions are more likely to occur in individuals with a history of beta-lactam hypersensitivity and/or a history of sensitivity to multiple allergens. There have been reports of individuals with a history of penicillin hypersensitivity who have experienced severe reactions when treated with cephalosporins. Before therapy with FETROJA is instituted, inquire about previous hypersensitivity reactions to cephalosporins, penicillins, or other beta-lactam antibacterial drugs. Discontinue FETROJA if an allergic reaction occurs. 5.3 Clostridioides difficile -associated Diarrhea (CDAD) Clostridioides difficile -associated diarrhea (CDAD) has been reported for nearly all systemic antibacterial agents, including FETROJA. CDAD may range in severity from mild diarrhea to fatal colitis. Treatment with antibacterial agents alters the normal flora of the colon and may permit overgrowth of C . difficile . C. difficile produces toxins A and B, which contribute to the development of CDAD. Hypertoxin-producing strains of C. difficile cause increased morbidity and mortality, as these infections can be refractory to antimicrobial therapy and may require colectomy. CDAD must be considered in all patients who present with diarrhea following antibacterial use. Careful medical history is necessary because CDAD has been reported to occur more than 2 months after the administration of antibacterial agents. If CDAD is suspected or confirmed, antibacterial drugs not directed against C. difficile may need to be discontinued. Manage fluid and electrolyte levels as appropriate, supplement protein intake, monitor antibacterial treatment of C. difficile , and institute surgical evaluation as clinically indicated. 5.4 Seizures and Other Central Nervous System (CNS) Adverse Reactions Cephalosporins, including FETROJA, have been implicated in triggering seizures [see Adverse Reactions (6.1) ] . Nonconvulsive status epilepticus (NCSE), encephalopathy, coma, asterixis, neuromuscular excitability, and myoclonia have been reported with cephalosporins particularly in patients with a history of epilepsy and/or when recommended dosages of cephalosporins were exceeded due to renal impairment. Adjust FETROJA dosing based on creatinine clearance [see Dosage and Administration (2.2) ] . Anticonvulsant therapy should be continued in patients with known seizure disorders. If CNS adverse reactions including seizures occur, patients should undergo a neurological evaluation to determine whether FETROJA should be discontinued. 5.5 Development of Drug-Resistant Bacteria Prescribing FETROJA in the absence of a proven or strongly suspected bacterial infection or a prophylactic indication is unlikely to provide benefit to the patient and increases the risk of the development of drug-resistant bacteria [see Indications and Usage (1.3) ] .

7 DRUG INTERACTIONS Use alternate testing methods to confirm positive results of dipstick tests (urine protein, ketones, or occult blood). ( 7.1 ) 7.1 Drug/Laboratory Test Interactions Cefiderocol may result in false-positive results in dipstick tests (urine protein, ketones, or occult blood). Use alternate clinical laboratory methods of testing to confirm positive tests.

6 ADVERSE REACTIONS The following serious adverse reactions are described in greater detail in the Warnings and Precautions section: Increase in All-Cause Mortality in Patients with Carbapenem-Resistant Gram-Negative Bacterial Infections [see Warnings and Precautions (5.1) ] Hypersensitivity Reactions [see Warnings and Precautions (5.2) ] Clostridioides difficile -associated Diarrhea (CDAD) [see Warnings and Precautions (5.3) ] Seizures and Other Central Nervous System Adverse Reactions [see Warnings and Precautions (5.4) ] cUTI: The most frequently occurring adverse reactions in greater than or equal to 2% of cUTI patients treated with FETROJA were diarrhea, infusion site reactions, constipation, rash, candidiasis, cough, elevations in liver tests, headache, hypokalemia, nausea, and vomiting. ( 6.1 ) HABP/VABP: The most frequently occurring adverse reactions in greater than or equal to 4% of HABP/VABP patients treated with FETROJA were elevations in liver tests, hypokalemia, diarrhea, hypomagnesemia, and atrial fibrillation. ( 6.1 ) To report SUSPECTED ADVERSE REACTIONS, contact Shionogi Inc. at 1-800-849-9707 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 practice. Complicated Urinary Tract Infections (cUTIs), Including Pyelonephritis FETROJA was evaluated in an active-controlled, randomized clinical trial in patients with cUTI, including pyelonephritis (Trial 1). In this trial, 300 patients received FETROJA 2 grams every 8 hours infused over 1 hour (or a renally-adjusted dose), and 148 patients were treated with imipenem/cilastatin 1gram/1gram every 8 hours infused over 1 hour (or a renally-adjusted dose). The median age of treated patients across treatment arms was 65 years (range 18 to 93 years), with approximately 53% of patients aged greater than or equal to 65. Approximately 96% of patients were White, most were from Europe, and 55% were female. Patients across treatment arms received treatment for a median duration of 9 days. Serious Adverse Reactions and Adverse Reactions Leading to Discontinuation In Trial 1, a total of 14/300 (4.7%) cUTI patients treated with FETROJA and 12/148 (8.1%) of cUTI patients treated with imipenem/cilastatin experienced serious adverse reactions. One death (0.3%) occurred in 300 patients treated with FETROJA as compared to none treated with imipenem/cilastatin. Discontinuation of treatment due to any adverse reaction occurred in 5/300 (1.7%) of patients treated with FETROJA and 3/148 (2.0%) of patients treated with imipenem/cilastatin. Specific adverse reactions leading to treatment discontinuation in patients who received FETROJA included diarrhea (0.3%), drug hypersensitivity (0.3%), and increased hepatic enzymes (0.3%). Common Adverse Reactions Table 4 lists the most common selected adverse reactions occurring in ≥ 2% of cUTI patients receiving FETROJA in Trial 1. Table 4 Selected Adverse Reactions Occurring in ≥ 2% of cUTI Patients Receiving FETROJA in Trial 1 Adverse Reaction FETROJA 2 grams IV over 1 hour every 8 hours (with dosing adjustment based on renal function). (N = 300) Imipenem/Cilastatin 1 gram IV over 1 hour every 8 hours (with dosing adjustment based on renal function and body weight). (N = 148) cUTI = complicated urinary tract infection. Diarrhea 4% 6% Infusion site reactions Infusion site reactions include infusion site erythema, inflammation, pain, pruritis, injection site pain, and phlebitis. 4% 5% Constipation 3% 4% Rash Rash includes rash macular, rash maculopapular, erythema, skin irritation. 3% < 1% Candidiasis Candidiasis includes oral or vulvovaginal candidiasis, candiduria. 2% 3% Cough 2% < 1% Elevations in liver tests Elevations in liver tests include alanine aminotransferase, aspartate aminotransferase, gamma-glutamyl transferase, blood alkaline phosphatase, hepatic enzyme increased. 2% < 1% Headache 2% 5% Hypokalemia Hypokalemia includes blood potassium decreased. 2% 3% Nausea 2% 4% Vomiting 2% 1% Other Adverse Reactions of FETROJA in the cUTI Patients (Trial 1) The following selected adverse reactions were reported in FETROJA-treated cUTI patients at a rate of less than 2% in Trial 1: Blood and lymphatic disorders : thrombocytosis Cardiac disorders : congestive heart failure, bradycardia, atrial fibrillation Gastrointestinal disorders : abdominal pain, dry mouth, stomatitis General system disorders : pyrexia, peripheral edema Hepatobiliary disorders : cholelithiasis, cholecystitis, gallbladder pain Immune system disorders : drug hypersensitivity Infections and infestations : C. difficile infection Laboratory investigations : prolonged prothrombin time (PT) and prothrombin time international normalized ratio (PT-INR), red blood cells urine positive, creatine phosphokinase increase Metabolism and nutrition disorders : decreased appetite, hypocalcemia, fluid overload Nervous system disorders : dysgeusia, seizure Respiratory, thoracic, and mediastinal disorders : dyspnea, pleural effusion Skin and subcutaneous tissue disorders : pruritis Psychiatric disorders : insomnia, restlessness Hospital-acquired Bacterial Pneumonia and Ventilator-associated Bacterial Pneumonia (HABP/VABP) FETROJA was evaluated in an active-controlled clinical trial in patients with HABP/VABP (Trial 2). In this trial, 148 patients received FETROJA 2 grams every 8 hours infused over 3 hours, and 150 patients received meropenem 2 grams every 8 hours infused over 3 hours. Doses of study treatments were adjusted based on renal function. The median age was 67 years, approximately 59% of patients were 65 years of age and older, 69% were male, and 68% were White. Overall, approximately 60% were ventilated at randomization, including 41% with VABP and 14% with ventilated HABP. The mean Acute Physiology And Chronic Health Evaluation (APACHE II) score was 16. All patients received empiric treatment for Gram-positive organisms with linezolid for at least 5 days. Serious Adverse Reactions and Adverse Reactions Leading to Discontinuation In Trial 2, serious adverse reactions occurred in 54/148 (36.5%) HABP/VABP patients treated with FETROJA and 45/150 (30%) of HABP/VABP patients treated with meropenem. Adverse reactions leading to death were reported in 39/148 (26.4%) patients treated with FETROJA and 35/150 (23.3%) patients treated with meropenem. Adverse reactions leading to discontinuation of treatment occurred in 12/148 (8.1%) of patients treated with FETROJA and 14/150 (9.3%) of patients treated with meropenem. The most common adverse reactions leading to discontinuation in both treatment groups were elevated liver tests. Common Adverse Reactions Table 5 lists the most common selected adverse reactions occurring in ≥ 4% of patients receiving FETROJA in the HABP/VABP trial. Table 5 Selected Adverse Reactions Occurring in ≥ 4% of HABP/VABP Patients Receiving FETROJA in Trial 2 Adverse Reaction FETROJA 2 grams IV over 3 hours every 8 hours (with dosing adjustment based on renal function). N = 148 Meropenem 2 grams IV over 3 hours every 8 hours (with dosing adjustment based on renal function). N = 150 HABP/VABP = hospital-acquired bacterial pneumonia/ventilator-associated bacterial pneumonia. Elevations in liver tests Elevations in liver tests include the following terms: aspartate aminotransferase increased, alanine aminotransferase increased, gamma-glutamyl transferase increased, liver function test increased, liver function test abnormal, hepatic enzyme increased, transaminases increased, hypertransaminesemia. 16% 16% Hypokalemia Hypokalemia includes blood potassium decreased. 11% 15% Diarrhea 9% 9% Hypomagnesemia 5% < 1% Atrial fibrillation 5% 3% Other Adverse Reactions of FETROJA in HABP/VABP Patients in Trial 2 The following selected adverse reactions were reported in FETROJA-treated HABP/VABP patients at a rate of less than 4% in Trial 2: Blood and lymphatic disorders : thrombocytopenia, thrombocytosis Cardiac disorders : myocardial infarction, atrial flutter Gastrointestinal disorders : nausea, vomiting, abdominal pain Hepatobiliary disorders : cholecystitis, cholestasis Infections and infestations : C. difficile infection, oral candidiasis Laboratory investigations : prolonged prothrombin time (PT) and prothrombin time international normalized ratio (PT-INR), activated partial thromboplastin time (aPTT) Metabolism and nutrition disorders : hypocalcemia, hyperkalemia Nervous system disorders : seizure Renal and genitourinary disorders : acute interstitial nephritis Respiratory, thoracic, and mediastinal disorders : cough Skin and subcutaneous tissue disorders : rash including rash erythematous 6.2 Postmarketing Experience The following adverse reactions have been identified during postapproval use of FETROJA. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure. Blood and lymphatic system disorders : neutropenia Renal and urinary disorders : chromaturia

8.1 Pregnancy Risk Summary There are no available data on FETROJA use in pregnant women to evaluate for a drug-associated risk of major birth defects, miscarriage, or adverse maternal or fetal outcomes. Available data from published prospective cohort studies, case series, and case reports over several decades with cephalosporin use in pregnant women have not established drug-associated risks of major birth defects, miscarriage, or adverse maternal or fetal outcomes (see Data ) . Developmental toxicity studies with cefiderocol administered during organogenesis to rats and mice showed no evidence of embryo-fetal toxicity, including drug-induced fetal malformations, at doses providing exposure levels 0.9 times (rats) or 1.3 times (mice) higher than the average observed in patients receiving the maximum recommended daily dose. The estimated background risk of major birth defects and miscarriage for the indicated population is unknown. All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2% to 4% and 15% to 20%, respectively. Data Human Data While available studies cannot definitively establish the absence of risk, published data from prospective cohort studies, case series, and case reports over several decades have not identified an association with cephalosporin use during pregnancy and major birth defects, miscarriage, or other adverse maternal or fetal outcomes. Available studies have methodologic limitations, including small sample size, retrospective data collection, and inconsistent comparator groups. Animal Data Developmental toxicity was not observed in rats at intravenous doses of up to 1000 mg/kg/day or mice at subcutaneous doses of up to 2000 mg/kg/day given during the period of organogenesis (gestation days 6-17 in rats and 6-15 in mice). No treatment-related malformations or reductions in fetal viability were observed. Mean plasma exposure (AUC) at these doses was approximately 0.9 times (rats) and 1.3 times (mice) the daily mean plasma exposure in patients that received 2 grams of cefiderocol infused intravenously every 8 hours. In a pre- and postnatal development study, cefiderocol was administered intravenously at doses up to 1000 mg/kg/day to rats from Day 6 of pregnancy until weaning. No adverse effects on parturition, maternal function, or pre- and postnatal development and viability of the pups were observed. In pregnant rats, cefiderocol-derived radioactivity was shown to cross the placenta, but the amount detected in fetuses was a small percentage (< 0.5%) of the dose.