VEKLURY contains remdesivir, a SARS-CoV-2 nucleotide analog RNA polymerase inhibitor. The chemical name for remdesivir is 2-ethylbutyl N -{( S )-[2- C -(4-aminopyrrolo[2,1-f][1,2,4]triazin-7-yl)-2,5-anhydro-d-altrononitril-6- O -yl]phenoxyphosphoryl}-L-alaninate. It has a molecular formula of C 27 H 35 N 6 O 8 P and a molecular weight of 602.6 g/mol. Remdesivir has the following structural formula: VEKLURY for injection contains 100 mg of remdesivir as a sterile, preservative-free lyophilized white to off-white to yellow powder in a single-dose clear glass vial. It requires reconstitution and then further dilution prior to administration by intravenous infusion . The inactive ingredients are 3 g betadex sulfobutyl ether sodium and may include hydrochloric acid and/or sodium hydroxide for pH adjustment. Chemical Structure

VEKLURY is indicated for the treatment of coronavirus disease 2019 (COVID-19) in adults and pediatric patients (birth to less than 18 years of age weighing at least 1.5 kg) who are : Hospitalized, or Not hospitalized and have mild-to-moderate COVID-19, and are at high risk for progression to severe COVID-19, including hospitalization or death. VEKLURY is a severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) nucleotide analog RNA polymerase inhibitor indicated for the treatment of coronavirus disease 2019 (COVID-19) in adults and pediatric patients (birth to less than 18 years of age weighing at least 1.5 kg) who are: Hospitalized, or Not hospitalized and have mild-to-moderate COVID-19, and are at high risk for progression to severe COVID-19, including hospitalization or death.

VEKLURY for injection, 100 mg, available as a sterile, preservative-free white to off-white to yellow lyophilized powder in single-dose vial for reconstitution. For injection: 100 mg of remdesivir as a lyophilized powder, in a single-dose vial.

Testing: In all patients, before starting VEKLURY and during treatment as clinically appropriate, perform hepatic laboratory testing. Assess prothrombin time before starting VEKLURY and monitor as clinically appropriate. Recommended dosage: Adults and pediatric patients weighing at least 40 kg: a single loading dose of VEKLURY 200 mg on Day 1 followed by once-daily maintenance doses of VEKLURY 100 mg from Day 2 via intravenous infusion. Pediatric patients (birth to less than 18 years of age) weighing 1.5 kg to less than 40 kg: Recommended dosage is based on weight. Refer to Table 1 of the full prescribing information for specific dosing guidelines based on body weight. Hospitalized patients: The treatment course of VEKLURY should be initiated as soon as possible after diagnosis of symptomatic COVID-19 has been made. For hospitalized patients requiring invasive mechanical ventilation and/or ECMO, the recommended total treatment duration is 10 days. For hospitalized patients not requiring invasive mechanical ventilation and/or ECMO, the recommended treatment duration is 5 days. If a patient does not demonstrate clinical improvement, treatment may be extended for up to 5 additional days for a total treatment duration of up to 10 days. Non-hospitalized patients: The treatment course of VEKLURY should be initiated as soon as possible after diagnosis of symptomatic COVID-19 has been made and within 7 days of symptom onset. For non-hospitalized patients diagnosed with mild-to-moderate COVID-19 who are at high risk for progression to severe COVID-19, including hospitalization or death, the recommended total treatment duration is 3 days. Renal impairment: No dosage adjustment of VEKLURY is recommended in patients with any degree of renal impairment, including those on dialysis. Administer VEKLURY via intravenous (IV) infusion over 30 to 120 minutes. Dose preparation and administration: Refer to the full prescribing information for further details. Storage of prepared dosages: VEKLURY contains no preservative

Dosage and Administration Overview VEKLURY may only be administered in settings in which healthcare providers have immediate access to medications to treat a severe infusion or hypersensitivity reaction, such as anaphylaxis, and the ability to activate the emergency medical system (EMS), as necessary . Administer VEKLURY for the treatment of COVID-19 in adults and pediatric patients (birth to less than 18 years of age weighing at least 1.5 kg) by intravenous infusion only. Do not administer by any other route. VEKLURY for injection must be reconstituted with Sterile Water for Injection prior to diluting with 0.9% sodium chloride injection

Testing Before Starting and During Treatment with VEKLURY Perform hepatic laboratory testing in all patients before starting VEKLURY and while receiving VEKLURY as clinically appropriate . Determine prothrombin time in all patients before starting VEKLURY and monitor while receiving VEKLURY as clinically appropriate

Recommended Dosage in Adults and Pediatric Patients (Birth to Less than 18 Years of Age Weighing at Least 1.5 kg) The recommended dosage for adults and pediatric patients weighing at least 40 kg is a single loading dose of VEKLURY 200 mg on Day 1 via intravenous infusion followed by once-daily maintenance doses of VEKLURY 100 mg from Day 2 via intravenous infusion. The recommended dosage for pediatric patients weighing 1.5 kg to less than 40 kg is presented in Table 1. Table 1 Recommended Dosage in Pediatric Patients Including Term Gestational age greater than 37 weeks. Neonates and Infants Weighing 1.5 kg to Less than 40 kg Pediatric Patient Population Loading Dose Via Intravenous Infusion Maintenance Dose Via Intravenous Infusion Less than 28 days old and at least 1.5 kg VEKLURY 2.5 mg/kg on Day 1 VEKLURY 1.25 mg/kg once daily from Day 2 At least 28 days old and 1.5 kg to less than 3 kg At least 28 days old and 3 kg to less than 40 kg VEKLURY 5 mg/kg on Day 1 VEKLURY 2.5 mg/kg once daily from Day 2 The treatment course of VEKLURY should be initiated as soon as possible after diagnosis of symptomatic COVID-19 has been made. The recommended total treatment duration for hospitalized patients requiring invasive mechanical ventilation and/or extracorporeal membrane oxygenation (ECMO) is 10 days. The recommended treatment duration for hospitalized patients not requiring invasive mechanical ventilation and/or ECMO is 5 days. If a patient does not demonstrate clinical improvement, treatment may be extended for up to 5 additional days for a total treatment duration of up to 10 days. Non-hospitalized patients : The treatment course of VEKLURY should be initiated as soon as possible after diagnosis of symptomatic COVID-19 has been made and within 7 days of symptom onset. The recommended total treatment duration for non-hospitalized patients diagnosed with mild-to-moderate COVID-19 who are at high risk for progression to severe COVID-19, including hospitalization or death, is 3 days. VEKLURY must be diluted prior to intravenous infusion. Refer to Dosage and Administration for detailed preparation and administration instructions

Renal Impairment No dosage adjustment of VEKLURY is recommended in patients with any degree of renal impairment, including patients on dialysis. VEKLURY may be administered without regard to the timing of dialysis

Dosage Preparation and Administration Reconstitution Instructions Remove the required number of single-dose vial(s) from storage. For each vial: Inspect the vial to ensure the container closure is free from defects. Aseptically reconstitute VEKLURY lyophilized powder by adding 19 mL of Sterile Water for Injection using a suitably sized syringe and needle per vial, and insert the needle in the center of the vial stopper. Only use Sterile Water for Injection to reconstitute VEKLURY lyophilized powder. Discard the vial if a vacuum does not pull the Sterile Water for Injection into the vial. Immediately shake the vial for 30 seconds. Allow the contents of the vial to settle for 2 to 3 minutes. A clear, colorless to yellow solution, free of visible particles, should result. If the contents of the vial are not completely dissolved, shake the vial again for 30 seconds and allow the contents to settle for 2 to 3 minutes. Repeat this procedure as necessary until the contents of the vial are completely dissolved. Discard the vial if the contents are not completely dissolved. Following reconstitution, each vial contains 100 mg/20 mL (5 mg/mL) of remdesivir solution. Use reconstituted product immediately to prepare the diluted drug product. Detailed dilution and administration instruction based on patient’s weight is provided below. Dilution Instructions for Adults and Pediatric Patients Weighing at Least 40 kg Care should be taken during admixture to prevent inadvertent microbial contamination. As there is no preservative or bacteriostatic agent present in this product, aseptic technique must be used in preparation of the final parenteral solution. It is always recommended to administer intravenous medication immediately after preparation when possible. Reconstituted VEKLURY for injection, containing 100 mg/20 mL remdesivir solution, must be further diluted in either a 100 mL or 250 mL 0.9% sodium chloride injection infusion bag. Refer to Table 2 for instructions. Table 2 Recommended Dilution Instructions—Reconstituted VEKLURY for Injection in Adults and Pediatric Patients Weighing at Least 40 kg VEKLURY dose 0.9% sodium chloride injection infusion bag volume to be used Volume to be withdrawn and discarded from 0.9% sodium chloride injection infusion bag Required volume of reconstituted VEKLURY for injection Loading dose 200 mg (2 vials) 250 mL 40 mL 40 mL (2 × 20 mL) 100 mL 40 mL 40 mL (2 × 20 mL) Maintenance dose 100 mg (1 vial) 250 mL 20 mL 20 mL 100 mL 20 mL 20 mL Withdraw and discard the required volume of 0.9% sodium chloride injection from the bag following instructions in Table 2, using an appropriately sized syringe and needle. Inspect the reconstituted VEKLURY for injection vial to ensure the solution is free of particulate matter. Withdraw the required volume of reconstituted VEKLURY for injection from the VEKLURY vial following instructions in Table 2, using an appropriately sized syringe. Discard any unused portion remaining in the reconstituted vial. Transfer the required volume of reconstituted VEKLURY for injection to the selected infusion bag. Gently invert the bag 20 times to mix the solution in the bag. Do not shake. The prepared infusion solution can be stored for 24 hours at room temperature (20°C to 25°C [68°F to 77°F]) or 48 hours at refrigerated temperature (2°C to 8°C [36°F to 46°F]) prior to administration. Administration Instructions for Adults and Pediatric Patients Weighing at Least 40 kg Do not administer the prepared diluted solution simultaneously with any other medication. The compatibility of VEKLURY injection with intravenous solutions and medications other than 0.9% sodium chloride injection, USP is not known. Administer VEKLURY via intravenous infusion over 30 to 120 minutes. Administration should be under conditions where management of severe hypersensitivity reactions, such as anaphylaxis, is possible. Monitor patients during infusion and observe patients for at least one hour after infusion is complete for signs and symptoms of hypersensitivity as clinically appropriate . Administer the diluted solution with the infusion rate described in Table 3. Table 3 Recommended Rate of Infusion—Diluted VEKLURY for Injection in Adults and Pediatric Patients Weighing at Least 40 kg Infusion bag volume Infusion time Rate of infusion 250 mL 30 min 8.33 mL/min 60 min 4.17 mL/min 120 min 2.08 mL/min 100 mL 30 min 3.33 mL/min 60 min 1.67 mL/min 120 min 0.83 mL/min Dilution Instructions for Pediatric Patients (Birth to Less than 18 Years of Age) Weighing 1.5 kg to Less than 40 kg Care should be taken during admixture to prevent inadvertent microbial contamination. As there is no preservative or bacteriostatic agent present in this product, aseptic technique must be used in preparation of the final parenteral solution. It is always recommended to administer intravenous medication immediately after preparation when possible. Inspect the reconstituted VEKLURY for injection vial to ensure the reconstituted solution is free of particulate matter. For pediatric patients (birth to less than 18 years of age) weighing 1.5 kg to less than 40 kg, the 100 mg/20 mL (5 mg/mL) remdesivir reconstituted solution should be further diluted to a fixed concentration of 1.25 mg/mL using 0.9% sodium chloride injection. The final required infusion volume concentration of 1.25 mg/mL remdesivir diluted solution for infusion is based on the pediatric weight-based dosing regimens. Small 0.9% sodium chloride injection infusion bags (e.g., 25, 50, or 100 mL) or an appropriately sized syringe should be used for pediatric dosing. The recommended dose is administered via intravenous infusion in a total volume dependent on the dose to yield the target remdesivir concentration of 1.25 mg/mL. A syringe and syringe pump may be used for infusion volumes less than 50 mL. Infusion with IV Bag Determine the total infusion volume needed to achieve a final infusion volume concentration of 1.25 mg/mL of remdesivir diluted solution based on the patient's calculated dose. Select an appropriately sized infusion bag (either prefilled with 0.9% sodium chloride injection or empty) to prepare VEKLURY diluted solution. If using a prefilled 0.9% sodium chloride injection infusion bag, withdraw and discard the amount of diluent equal to the volume of reconstituted VEKLURY solution needed per patient's dose plus a quantity sufficient to achieve a 1.25 mg/mL final volume concentration of remdesivir diluted solution. Withdraw the required volume of reconstituted VEKLURY solution into an appropriately sized syringe. Transfer the required volume of reconstituted VEKLURY solution to the 0.9% sodium chloride injection infusion bag. Gently invert the bag 20 times to mix the solution in the bag. Do not shake. If using an empty infusion bag, transfer the required volume of reconstituted VEKLURY solution to the bag, followed by a volume of 0.9% sodium chloride injection sufficient to achieve a 1.25 mg/mL final volume concentration of remdesivir diluted solution. The prepared infusion solution is stable for 24 hours at room temperature (20°C to 25°C [68°F to 77°F]) or 48 hours at refrigerated temperature (2°C to 8°C [36°F to 46°F]). Infusion with Syringe Determine the total infusion volume needed to achieve a final infusion volume concentration of 1.25 mg/mL of remdesivir diluted solution based on patient's calculated dose. Select an appropriately sized syringe equal to or larger than the calculated total infusion volume of 1.25 mg/mL remdesivir solution needed. Withdraw the required volume of reconstituted VEKLURY solution from the vial into the syringe based on patient's calculated dose, followed by the required volume of 0.9% sodium chloride injection needed to achieve a 1.25 mg/mL final volume concentration of remdesivir diluted solution. Gently invert the syringe 20 times to mix the solution in the syringe. Do not shake. The prepared diluted solution should be used immediately. Administration Instructions for Pediatric Patients (Birth to Less than 18 Years of Age) Weighing 1.5 kg to Less than 40 kg The prepared diluted solution should not be administered simultaneously with any other medication. The compatibility of VEKLURY with IV solutions and medications other than 0.9% sodium chloride injection, USP is not known. Administer VEKLURY via intravenous infusion over 30 to 120 minutes. The rate of infusion (mL/min) should be calculated based on the total infusion volume and total infusion time. Administration should be under conditions where management of severe hypersensitivity reactions, such as anaphylaxis, is possible. Monitor patients during infusion and observe patients for at least one hour after infusion is complete for signs and symptoms of hypersensitivity as clinically appropriate

Storage of Prepared Dosages After reconstitution, use vials immediately to prepare diluted solution. The diluted VEKLURY solution in the infusion bags can be stored up to 24 hours at room temperature (20°C to 25°C [68°F to 77°F]) prior to administration or 48 hours at refrigerated temperature (2°C to 8°C [36°F to 46°F]). IMPORTANT: This product contains no preservative. Any unused portion of a single-dose VEKLURY vial should be discarded after a diluted solution is prepared.

Hypersensitivity including infusion-related and anaphylactic reactions: Hypersensitivity reactions have been observed during and following administration of VEKLURY. Slower infusion rates, with a maximum infusion time of up to 120 minutes, can be considered to potentially prevent signs and symptoms of hypersensitivity. Monitor patients during infusion and observe patients for at least one hour after infusion is complete for signs and symptoms of hypersensitivity as clinically appropriate. If signs and symptoms of a clinically significant hypersensitivity reaction occur, immediately discontinue administration of VEKLURY and initiate appropriate treatment. Increased risk of transaminase elevations: Transaminase elevations have been observed in healthy volunteers and have also been reported in patients with COVID-19 who received VEKLURY. Perform hepatic laboratory testing in all patients before starting VEKLURY and while receiving VEKLURY as clinically appropriate. Consider discontinuing VEKLURY if ALT levels increase to greater than 10 times the upper limit of normal. Discontinue VEKLURY if ALT elevation is accompanied by signs or symptoms of liver inflammation. Risk of reduced antiviral activity when coadministered with chloroquine phosphate or hydroxychloroquine sulfate: Coadministration of VEKLURY and chloroquine phosphate or hydroxychloroquine sulfate is not recommended based on data from cell culture experiments demonstrating a potential antagonistic effect of chloroquine on the intracellular metabolic activation and antiviral activity of VEKLURY. 5.1 Hypersensitivity Including Infusion-related and Anaphylactic Reactions Hypersensitivity reactions, including infusion-related and anaphylactic reactions, have been observed during and following administration of VEKLURY; most occurred within one hour. Signs and symptoms may include hypotension, hypertension, tachycardia, bradycardia, hypoxia, fever, dyspnea, wheezing, angioedema, rash, nausea, diaphoresis, and shivering. Slower infusion rates, with a maximum infusion time of up to 120 minutes, can be considered to potentially prevent these signs and symptoms. Monitor patients during infusion and observe patients for at least one hour after infusion is complete for signs and symptoms of hypersensitivity as clinically appropriate. If signs and symptoms of a clinically significant hypersensitivity reaction occur, immediately discontinue administration of VEKLURY and initiate appropriate treatment. The use of VEKLURY is contraindicated in patients with known hypersensitivity to VEKLURY or any components of the product

Increased Risk of Transaminase Elevations Transaminase elevations have been observed in healthy volunteers who received 200 mg of VEKLURY followed by 100 mg doses for up to 10 days; the transaminase elevations were mild (Grade 1) to moderate (Grade 2) in severity and resolved upon discontinuation of VEKLURY. Transaminase elevations have also been reported in patients with COVID-19 who received VEKLURY . Because transaminase elevations have been reported as a clinical feature of COVID-19, and the incidence was similar in patients receiving placebo versus VEKLURY in clinical trials of VEKLURY, discerning the contribution of VEKLURY to transaminase elevations in patients with COVID-19 can be challenging. Perform hepatic laboratory testing in all patients before starting VEKLURY and while receiving VEKLURY as clinically appropriate . Consider discontinuing VEKLURY if ALT levels increase to greater than 10 times the upper limit of normal. Discontinue VEKLURY if ALT elevation is accompanied by signs or symptoms of liver inflammation

Risk of Reduced Antiviral Activity When Coadministered with Chloroquine Phosphate or Hydroxychloroquine Sulfate Coadministration of VEKLURY and chloroquine phosphate or hydroxychloroquine sulfate is not recommended based on data from cell culture experiments demonstrating a potential antagonistic effect of chloroquine on the intracellular metabolic activation and antiviral activity of VEKLURY .

7.1 Effects of Other Drugs on VEKLURY Due to potential antagonism based on data from cell culture experiments, concomitant use of VEKLURY with chloroquine phosphate or hydroxychloroquine sulfate is not recommended . Based on drug interaction studies conducted with VEKLURY, no clinically significant drug interactions are expected with inducers of cytochrome P450 (CYP) 3A4 or inhibitors of Organic Anion Transporting Polypeptides (OATP) 1B1/1B3 and, P-glycoprotein (P-gp)

Effects of VEKLURY on Other Drugs Based on drug interaction studies conducted with VEKLURY, it is a weak inhibitor of CYP3A and does not inhibit OATP1B1/1B3 .