VYKAT XR

1 INDICATIONS AND USAGE VYKAT XR is indicated for the treatment of hyperphagia in adults and pediatric patients 4 years of age and older with Prader-Willi syndrome (PWS). VYKAT XR is indicated for the treatment of hyperphagia in adults and pediatric patients 4 years of age and older with Prader-Willi syndrome (PWS). ( 1 )

2 DOSAGE AND ADMINISTRATION Prior to initiation, test fasting plasma glucose and HbA1c; optimize blood glucose in patients who have hyperglycemia. ( 2.1 ) Do not substitute with diazoxide oral suspension. ( 2.1 ) Administer orally once daily. ( 2.2 ) Recommended starting dosage and titration schedule is based on patient’s body weight. ( 2.2 ) Weight Starting Dosage Titration Dosage Titration Dosage Target Maintenance Dose Weeks 1 and 2 Weeks 3 and 4 Weeks 5 and 6 20 to <30 kg 25 mg 50 mg 75 mg 100 mg 30 to <40 kg 75 mg 150 mg 150 mg 150 mg 40 to <65 kg 75 mg 150 mg 225 mg 225 mg 65 to <100 kg 150 mg 225 mg 300 mg 375 mg 100 to <135 kg 150 mg 300 mg 375 mg 450 mg ≥135 kg 150 mg 300 mg 450 mg 525 mg The maximum recommended dosage is 5.8 mg/kg/day or 525 mg per day. ( 2.2 ) Interrupt VYKAT XR or reduce dosage for clinically significant elevations in fasting glucose or HbA1c; consider dosage reduction or interruption for clinically significant fluid overload. ( 2.3 ) See full prescribing information for VYKAT XR dosage modifications due to drug interactions ( 2.4 ) Following dosage interruption or a missed dose of 7 days or more, re-titrate according to Table 1 or Table 2 . ( 2.5 ) 2.1 Important Recommendations Prior to VYKAT XR Initiation Laboratory Testing Prior to VYKAT XR Initiation Prior to initiating treatment with VYKAT XR, test fasting plasma glucose (FPG) and HbA1c and optimize blood glucose in patients who have hyperglycemia [see Warnings and Precautions (5.1) ] . For fasting glucose and HbA1c monitoring recommendations during VYKAT XR treatment and for dosage modifications based on results, see Dosage and Administration (2.3) . Important Information Regarding Substitution Do not substitute VYKAT XR with diazoxide oral suspension because the pharmacokinetic profiles are different [see Clinical Pharmacology (12.3) ] . 2.2 Dosage and Administration Recommendations Administer VYKAT XR orally with or without food once daily [see Clinical Pharmacology (12.3) ] . Swallow tablets whole. Do not split, crush, or chew the extended-release tablets because doing so may compromise the extended-release characteristics, efficacy, or safety of VYKAT XR. The recommended oral dosage of VYKAT XR is based on body weight. The recommended starting dosage and titration schedule of VYKAT XR are shown in Table 1 . Table 1: Recommended Starting Dosage and Titration Regimen in Adults and Pediatric Patients 4 Years of Age and Older Weight Recommended Once Daily Dosage Starting Dosage Titration Dosage Titration Dosage Target Maintenance Dose Weeks 1 and 2 Weeks 3 and 4 Weeks 5 and 6 20 kg to <30 kg 25 mg 50 mg 75 mg 100 mg 30 kg to <40 kg 75 mg 150 mg 150 mg 150 mg 40 kg to <65 kg 75 mg 150 mg 225 mg 225 mg 65 kg to <100 kg 150 mg 225 mg 300 mg 375 mg 100 kg to <135 kg 150 mg 300 mg 375 mg 450 mg ≥135 kg 150 mg 300 mg 450 mg 525 mg The maximum recommended dosage of VYKAT XR is 5.8 mg/kg/day or 525 mg per day. Dosages above 5.8 mg/kg/day or 525 mg per day have not been evaluated in patients with PWS. 2.3 Monitoring and Dosage Modifications Due to Adverse Reactions Elevations in Fasting Glucose or HbA1c After initiating treatment with VYKAT XR, monitor: Fasting glucose (FPG or fasting blood glucose) at least once every week for the first 2 weeks, then at least once every 4 weeks, and as clinically indicated. HbA1c every 3 months and as clinically indicated. Monitor fasting glucose more frequently during the first few weeks of VYKAT XR treatment in patients with risk factors for hyperglycemia. If clinically significant elevations in fasting glucose of HbA1c occur during treatment, temporarily interrupt VYKAT XR or reduce the dosage until glycemic parameters are appropriately managed. Consider initiation or adjustment of standard antidiabetic therapy(ies). If clinically significant glucose elevations are noted during titration, titrate over a longer duration and/or to a lower dosage [see Warnings and Precautions (5.1) ] . Fluid Overload Monitor for signs or symptoms of edema or fluid overload. Consider dosage reduction or temporary dosage interruption in the event of clinically significant fluid overload. If clinically significat fluid overload is noted during titration, titrate over a longer duration and/or to a lower dosage [see Warnings and Precautions (5.2) ] . Titration After Resolution of Fluid Overload or Elevation in Fasting Glucose or HbA1c If fluid overload or elevations in fasting glucose or HbA1c resolve after a dosage reduction: For patients weighing less than 30 kg, titrate the dosage in increments of no more than 25 mg every 2 weeks or titrate over longer duration to a maximum dosage of 5.8 mg/kg/day. For patients weighing greater than or equal to 30 kg, titrate the dosage in increments of no more than 75 mg every 2 weeks or titrate over longer duration to a maximum dosage of 5.8 mg/kg/day. For recommendations on resuming VYKAT XR after dosage interruption, see Dosage and Administration (2.5) . 2.4 Dosage Modifications for Concomitant Use with Strong CYP1A2 Inhibitors VYKAT XR dosage modifications for concomitant use with strong CYP1A2 inhibitors are shown in Table 2 [see Drug Interactions (7) ] . Table 2: VYKAT XR Dosage Modifications for Concomitant Use with Strong CYP1A2 Inhibitors Weight VYKAT XR Recommended Once Daily Dosage Starting Dosage Titration Dosage Titration Dosage Target Maintenance Dose Weeks 1 and 2 Weeks 3 and 4 Weeks 5 and 6 20 to <30 kg 25 mg 25 mg 50 mg 75 mg 30 to <40 kg 50 mg 100 mg 100 mg 100 mg 40 to <65 kg 50 mg 100 mg 150 mg 150 mg 65 to <100 kg 100 mg 150 mg 200 mg 250 mg 100 to <135 kg 100 mg 200 mg 250 mg 300 mg ≥135 kg 100 mg 200 mg 300 mg 325 mg Based on clinical response, VYKAT XR may be titrated to a maximum recommended dosage of 3.6 mg/kg/day. The VYKAT XR daily dosage should not exceed 325 mg per day. No dosage modification is recommended when VYKAT XR is concomitantly used with moderate CYP1A2 inhibitors. 2.5 Recommendations Regarding Dosage Interruption, Missed Dose, or Discontinuation of Treatment Following a dosage interruption or missed dose of: Less than 7 days, resume VYKAT XR at the previous dosage 7 days or more, re-titrate VYKAT XR according to Table 1 or 2 , as appropriate [see Dosage and Administration (2.2 , 2.4) ] Treatment with VYKAT XR can be discontinued without tapering.

6 ADVERSE REACTIONS The following clinically significant adverse reactions are discussed in greater detail in other sections of the labeling: Hyperglycemia [see Warnings and Precautions (5.1) ] Risk of Fluid Overload [see Warnings and Precautions (5.2) ] Adverse Reactions from Clinical Studies of VYKAT XR in Patients with PWS 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. In the clinical study development program for treatment of hyperphagia in patients aged 4 years and older with PWS, a total of 125 patients received at least 1 dose of VYKAT XR. Patients received dosages of VYKAT XR up to 5.8 mg/kg/day (up to a maximum dosage of 525 mg/day) for up to 4.86 years (median: 3.0 years) in the following studies: Study 1: 13-week, randomized, double-blind, placebo-controlled, parallel-arm study in which 126 patients were randomized in a 2:1 ratio to VYKAT XR or placebo and received at least one dose of VYKAT XR. Study 2-OLE: A long-term, open-label, maintenance treatment period in 115 patients (mean duration 2.6 years; maximum duration 4.3 years) who had previously been enrolled in Study 1. Study 2-RWP: A 16-week, double-blind, placebo-controlled, randomized withdrawal treatment period, in which 77 patients who had completed Study 1 and Study 2-OLE were randomized in a 1:1 ratio to VYKAT XR or placebo [see Clinical Studies (14) ] . Study 3: A long-term, open-label, maintenance study in 77 patients who had completed Study 1 and Study 2-OLE. Adverse reactions leading to discontinuation in VYKAT XR-treated patients included aggression, diabetes mellitus, fluid retention, hirsutism, hyperglycemia, lower respiratory tract infection, peripheral edema, pulmonary edema, and papular rash. The primary safety analyses are based on Study 1. The most common adverse reactions (10% or more and at least 2% greater than in placebo) in Study 1 were hypertrichosis, edema, hyperglycemia, and rash. Table 3 presents adverse reactions that occurred in at least 5% of patients in Study 1 receiving VYKAT XR and 2% more frequently in VYKAT XR-treated patients than placebo. Table 3: Adverse Reactions Occurring in ≥5% of Patients with PWS Receiving VYKAT XR and at Least 2% Greater than Placebo in Study 1 Adverse Reaction VYKAT XR (N=84) Placebo (N=42) Hypertrichosis 36% 14% Edema Edema includes peripheral edema, periorbital edema, swelling face, pulmonary edema, and peripheral swelling. 27% 12% Hyperglycemia Hyperglycemia includes type 2 diabetes mellitus. 17% 5% Rash Rash includes contact dermatitis, erythema multiforme, maculo-papular rash, papular rash, and urticaria. 12% 2% Pyrexia 6% 0% Arthralgia 5% 2% Influenza 5% 2% Nasopharyngitis 5% 2% In Study 2-RWP, the adverse reactions that occurred most frequently (at least 5%) and to a greater extent than placebo included: Immune System Disorders: Seasonal allergy Investigations: Increased weight Nervous System Disorders: Hyperphagia, anxiety, affect lability, anger, compulsive hoarding, suicidal ideation Respiratory Disorders: Streptococcal pharyngitis, upper respiratory infection Skin and Subcutaneous Tissue Disorders: Hirsutism Erythema multiforme was reported in one subject in Study 1. One subject in Study 3 experienced a serious adverse reaction of diabetic ketoacidosis. Adverse Reactions from Clinical Trials or Postmarketing Experience of Diazoxide in An Unapproved Population The following adverse reactions associated with use of diazoxide for an unapproved population have been identified in clinical studies or post-marketing reports. Because some of these reactions were 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. Immune System Disorders: Hypersensitivity Investigations: Increased serum uric acid, transient neutropenia, thrombocytopenia, decreased hemoglobin/hematocrit, eosinophilia Respiratory Disorders: Pulmonary hypertension Special Senses: Cataracts Musculoskeletal and Connective Tissue Disorders: Abnormal facial features Most common adverse reactions (incidence ≥10% and at least 2% greater than in placebo) are hypertrichosis, edema, hyperglycemia, and rash. ( 6 ) To report SUSPECTED ADVERSE REACTIONS, contact Soleno Therapeutics, Inc. at 1-833-765-3661 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.

7 DRUG INTERACTIONS Table 4 displays clinically significant drug interactions with VYKAT XR. Table 4: Clinically Significant Drug Interactions with VYKAT XR Strong CYP1A2 Inhibitors See www.fda.gov/CYPandTransporterInteractingDrugs for examples of strong CYP1A2 and CYP3A4 inhibitors, sensitive CYP1A2 substrates, and dual strong CYP3A4 / moderate 1A2 inducers. Prevention or Management Reduce the dosage of VYKAT XR when concomitantly used with strong inhibitors of CYP1A2 [see Dosage and Administration (2.4) ] . Mechanism and Clinical Effect(s) VYKAT XR is a CYP1A2 substrate. Concomitant use of VYKAT XR with strong CYP1A2 inhibitors increases exposure of diazoxide, which may increase the frequency and/or severity of adverse reactions from VYKAT XR [see Clinical Pharmacology (12.3) ] . CYP1A2 Substrates Prevention or Management Concomitant use of VYKAT XR with CYP1A2 substrates is not recommended. Mechanism and Clinical Effect(s) VYKAT XR is an inhibitor of CYP1A2. Concomitant use of VYKAT XR with CYP1A2 substrates increases exposure of these substrates. This may increase the frequency and/or severity of adverse reactions from such substrates. Strong CYP3A4 Inhibitors Prevention or Management Monitor the frequency and severity of adverse reactions from VYKAT XR. A dosage reduction of VYKAT XR may be needed when used concomitantly with strong CYP3A4 inhibitors. Mechanism and Clinical Effect(s) Concomitant use of VYKAT XR with strong CYP3A4 inhibitors increases exposure of diazoxide, which may increase the frequency and/or severity of adverse reactions from VYKAT XR [see Clinical Pharmacology (12.3) ] . Dual Strong CYP3A4 / Moderate 1A2 Inducers Prevention or Management Concomitant use of VYKAT XR with dual strong CYP3A4/moderate CYP1A2 inducers is not recommended. Mechanism and Clinical Effect(s) VYKAT XR is a substrate of CYP3A4 and CYP1A2. Concomitant use of VYKAT XR with strong CYP3A4/moderate 1A2 inducers may decrease exposure of VYKAT XR. This may decrease the efficacy of VYKAT XR [see Clinical Pharmacology (12.3) ] . Drugs Highly Bound to Protein Prevention or Management Monitor international normalized ratio (INR) in patients who use coumarin or its derivatives concomitantly with VYKAT XR. Dosage modification of coumarin or its derivatives may be needed when used concomitantly with VYKAT XR. Monitor diphenylhydantoin serum levels when VYKAT XR is used concomitantly with diphenylhydantoin. Dosage modification of diphenylhydantoin may be needed when used concomitantly with VYKAT XR. Mechanism and Clinical Effect(s) Diazoxide is highly bound to serum proteins. Diazoxide may displace other drugs which are also highly bound to protein resulting in higher or lower blood levels of the concomitantly used drugs. The impact of protein binding displacement is expected to be clinically important for drugs with narrow therapeutic range such as coumarin or its derivatives and diphenylhydantoin. Protein binding displacement may result in an increased risk of adverse reactions due to higher blood levels of coumarin or its derivative or loss of efficacy due to lower exposures of diphenylhydantoin. Thiazide or Other Diuretics Prevention or Management Monitor for signs and symptoms of hyperglycemia [see Warnings and Precautions (5.1) ] and hyperuricemia when VYKAT XR is used concomitantly with thiazides or other diuretics. Dosage adjustment of VYKAT XR or diuretics may be needed when VYKAT XR is concomitantly used with diuretics. Mechanism and Clinical Effect(s) Both diazoxide and thiazides or other diuretics may produce hyperglycemia and hyperuricemia. The concomitant use of VYKAT XR with thiazides or other diuretics may potentiate the hyperglycemic and hyperuricemic effects of diazoxide [see Adverse Reactions (6) and Clinical Pharmacology (12.2) ] . Strong CYP1A2 Inhibitors: Reduce VYKAT XR dosage. ( 2.4 , 7 ) CYP1A2 Substrates: Concomitant use with VYKAT XR is not recommended. ( 7 ) See full prescribing information for additional clinically significant drug interactions. ( 7 )

16 HOW SUPPLIED/STORAGE AND HANDLING How Supplied VYKAT XR is supplied as follows: Strength Description Package Configuration NDC Number 25 mg diazoxide choline White, capsule-shaped tablets, debossed with "S-25" on one side 30-count bottles 83860-025-01 75 mg diazoxide choline White, round, standard convex tablets, debossed with "S-75" on one side 30-count bottles 83860-075-01 150 mg diazoxide choline White, oval-shaped tablets, debossed with “S-150” on one side. 30-count bottles 83860-150-01 Storage and Handling Store at 20°C to 25°C (68°F to 77°F); excursions permitted between 15° and 30°C (59° and 86°F) [see USP Controlled Room Temperature]. Keep in tightly closed container. Protect from humidity. Do not remove desiccant.