Zilretta Drug Information

(triamcinolone acetonide extended-release injectable suspension) is indicated as an intra-articular injection for the management of osteoarthritis pain of the knee. ZILRETTA is an extended-release synthetic corticosteroid indicated as an intra-articular injection for the management of osteoarthritis pain of the knee. Limitation of Use The efficacy and safety of repeat administration of ZILRETTA have not been demonstrated.

Limitation of Use The efficacy and safety of repeat administration of ZILRETTA have not been demonstrated. .

Important Dosage and

Administration Information ZILRETTA is administered as a single intra-articular extended-release injection of triamcinolone acetonide, to deliver 32 mg (5 mL). ZILRETTA is for intra-articular use only. Do NOT administer by the following routes: epidural, intrathecal, intravenous, intraocular, intramuscular, intradermal, subcutaneous. ZILRETTA is not suitable for use in small joints, such as the hand.

The efficacy and safety of repeat administration of ZILRETTA have not been demonstrated . The efficacy and safety of ZILRETTA for management of osteoarthritis pain of shoulder and hip have not been evaluated.

Preparation and

Administration of Intra-Articular Suspension Refer to the Instructions for Use for directions on the preparation and administration of ZILRETTA. ZILRETTA is supplied as a single-dose kit containing a vial of ZILRETTA microsphere powder, a vial of sterile diluent, and a sterile vial adapter. ZILRETTA must be prepared using the diluent supplied in the kit. Preparation of ZILRETTA requires close attention to the Instructions for Use to ensure successful administration.

Use proper aseptic technique throughout the dose preparation and administration procedure. ZILRETTA is a suspension product and it is normal for some residue to be left behind on the vial walls after withdrawing the contents. Promptly inject ZILRETTA after preparation to avoid settling of the suspension.

If needed, the ZILRETTA suspension can be stored in the vial for up to 4 hours at ambient conditions. Gently swirl the vial to resuspend any of the settled microspheres prior to preparing the syringe for injection. The usual technique for intra-articular injection should be followed.

Aspiration of synovial fluid may be performed based on clinical judgment prior to administration of ZILRETTA.

Non-Interchangeability with Other Formulations of Triamcinolone Acetonide for Intra-articular Use

ZILRETTA is NOT substitutable with other formulations of injectable triamcinolone acetonide.

Clinical Trials

Because clinical studies 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. The data below reflect exposure to a single 32 mg intra-articular injection of ZILRETTA in clinical studies in patients with moderate to severe pain due to osteoarthritis of the knee. Clinical studies included randomized, double-blind, parallel-group, placebo and/or active-controlled, and pharmacokinetic/pharmacodynamic studies with follow-up ranging from 6-24 weeks.

A total of 424 patients received ZILRETTA and 262 received placebo. Treatment emergent adverse reactions reported by greater than or equal to 1% of patients in the ZILRETTA arms are summarized below ( Table 1 and 2 ). Overall, the incidence and nature of adverse reactions was similar to that observed with placebo. Table 1: Most Commonly Reported Treatment-Emergent Adverse Reactions with ZILRETTA (Incidence ≥1%) in Patients with Osteoarthritis of the Knee Preferred Term (MedDRA) ZILRETTA (N=424) Placebo (N=262) Sinusitis 2% 1% Cough 2% 1% Contusions 2% 1% Table 2: Most Commonly Reported Treatment-Emergent Injected Knee Adverse Reactions with ZILRETTA (Incidence ≥1%) in Patients with Osteoarthritis of the Knee Preferred Term (MedDRA) ZILRETTA (N=424) Placebo (N=262) Joint Swelling 3% 2% Contusions 2% 1% The safety of repeat administration of ZILRETTA was evaluated in a multicenter, open-label, single-arm study in patients with osteoarthritis pain of the knee.

A total of 179 patients received a repeat injection on or after Week 12 (median 16.6 weeks) and were followed for 52 weeks from the initial injection. As assessed by adverse event rates for the periods of baseline to second dose and second dose to the comparable period after the second dose, there were higher rates of reported mild to moderate arthralgia after the second dose (16%) than after the first dose (6%). The data from this study are insufficient to fully characterize the safety of repeat administration of ZILRETTA..

Post-marketing Experience

The following adverse reactions, presented alphabetically by body system, have been identified during post-approval use of ZILRETTA. 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. Endocrine : Increased blood glucose (in diabetic patients). General and administration site conditions : Pain including injection site pain or discomfort and leg pain. Immune system : Hypersensitivity reactions including pruritus, rash, angioedema, and anaphylaxis . Infections and Infestations : Septic arthritis . Musculoskeletal : Arthralgia, joint swelling or effusion, muscle spasms.

Nervous system : Headache. Reproductive system : Postmenopausal vaginal bleeding (similar to a menstrual period). Skin and Subcutaneous Tissue : Pruritus.

Corticosteroid Adverse Reactions

The following adverse reactions, presented alphabetically by body system, are from voluntary reports or clinical studies of corticosteroids. Because some of 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. Anaphylactic reactions : Anaphylaxis including death, angioedema . Cardiovascular : Bradycardia, cardiac arrest, cardiac arrhythmias, cardiac enlargement, circulatory collapse, congestive heart failure, hypertension , fat embolism, hypertrophic cardiomyopathy in premature infants, myocardial rupture following recent myocardial infarction, pulmonary edema, syncope, tachycardia, thromboembolism, thrombophlebitis, vasculitis.

Dermatologic : Acne, allergic dermatitis, cutaneous and subcutaneous atrophy, dry scaly skin, ecchymoses and petechiae, edema, erythema, hyperpigmentation, hypopigmentation, impaired wound healing, increased sweating, lupus erythematosus-like lesions, purpura, rash, sterile abscess, striae, suppressed reactions to skin tests, thin fragile skin, thinning scalp hair, urticaria. Endocrine : Decreased carbohydrate and glucose tolerance, development of Cushingoid state, glycosuria, hirsutism, hypertrichosis, increased requirements for insulin or oral hypoglycemic agents in diabetes, manifestations of latent diabetes mellitus, menstrual irregularities, secondary adrenocortical and pituitary unresponsiveness (particularly in times of stress, as in trauma, surgery, or illness), suppression of growth in pediatric patients. Fluid and electrolyte disturbances : Congestive heart failure in susceptible patients , fluid retention, sodium retention.

Gastrointestinal : Abdominal distention, bowel/bladder dysfunction (after intrathecal administration) , elevation in serum liver enzyme levels (usually reversible upon discontinuation), hepatomegaly, increased appetite, nausea, pancreatitis, peptic ulcer with possible perforation and hemorrhage, perforation of the small and large intestine (particularly in patients with inflammatory bowel disease) , ulcerative esophagitis. Metabolic : Negative nitrogen balance due to protein catabolism. Musculoskeletal : Aseptic necrosis of femoral and humeral heads, calcinosis (following intra-articular or intralesional use), Charcot-like arthropathy, loss of muscle mass, muscle weakness, osteoporosis, pathologic fracture of long bones, post injection flare (following intra-articular use), steroid myopathy, tendon rupture, vertebral compression fractures.

Neurologic/Psychiatric : Convulsions, depression, emotional instability, euphoria, headache, increased intracranial pressure with papilledema (pseudotumor cerebri) usually following discontinuation of treatment, insomnia, mood swings, neuritis, neuropathy, paresthesia, personality changes, psychiatric disorders , vertigo. Arachnoiditis, meningitis, paraparesis/paraplegia, and sensory disturbances have occurred after intrathecal administration. Spinal cord infarction, paraplegia, quadriplegia, cortical blindness, and stroke (including brainstem) have been reported after epidural administration of corticosteroids . Ophthalmic : Exophthalmos, glaucoma, increased intraocular pressure , posterior subcapsular cataracts, rare instances of blindness associated with periocular injections.

Other : Abnormal fat deposits, decreased resistance to infection, hiccups, increased or decreased motility and number of spermatozoa, malaise, moon face, weight gain.

No drug-drug interaction studies have been conducted with ZILRETTA. Table 3 contains drug interactions associated with systemic corticosteroids. Table 3: Drug Interactions Associated with Systemic Corticosteroids Aminoglutethimide Aminoglutethimide may lead to a loss of corticosteroid-induced adrenal suppression. Amphotericin B injection and potassium-depleting agents When corticosteroids are administered concomitantly with potassium-depleting agents (i.e., amphotericin B, diuretics), observe patients closely for development of hypokalemia.

There have been cases reported in which concomitant use of amphotericin B and hydrocortisone was followed by cardiac enlargement and congestive heart failure. Antibiotics Macrolide antibiotics have been reported to cause a significant decrease in corticosteroid clearance. Anticholinesterases Concomitant use of anticholinesterase agents and corticosteroids may produce severe weakness in patients with myasthenia gravis.

If possible, withdraw anticholinesterase agents at least 24 hours before initiating corticosteroid therapy. Anticoagulants, oral Coadministration of corticosteroids and warfarin usually results in inhibition of response to warfarin, although there have been some conflicting reports. Therefore, monitor coagulation indices frequently to maintain the desired anticoagulant effect.

Antidiabetics Because corticosteroids may increase blood glucose concentrations, dosage adjustments of antidiabetic agents may be required. Antitubercular drugs Serum concentrations of isoniazid may be decreased. CYP 3A4 inducers (e.g., barbiturates, phenytoin, carbamazepine, and rifampin) Drugs which induce hepatic microsomal drug metabolizing enzyme activity may enhance metabolism of corticosteroids and require that the dosage of corticosteroid be increased.

CYP 3A4 inhibitors (e.g., ketoconazole) Ketoconazole, a strong CYP3A4 inhibitor, has been reported to decrease the metabolism of certain corticosteroids by up to 60% leading to an increased risk of corticosteroid side effects. Cholestyramine Cholestyramine may increase the clearance of corticosteroids. Cyclosporine Increased activity of both cyclosporine and corticosteroids may occur when the two are used concurrently.

Convulsions have been reported with this concurrent use. Digitalis glycosides Patients on digitalis glycosides may be at increased risk of arrhythmias due to hypokalemia. Estrogens, including oral contraceptives Estrogens may decrease the hepatic metabolism of certain corticosteroids, thereby increasing their effect.

Nonsteroidal anti-inflammatory drugs (NSAIDs) Concomitant use of aspirin (or other nonsteroidal anti-inflammatory drugs) and corticosteroids increases the risk of gastrointestinal side effects. Aspirin should be used cautiously in conjunction with corticosteroids in hypoprothrombinemia. The clearance of salicylates may be increased with concurrent use of corticosteroids.

Skin tests Corticosteroids may suppress reactions to allergy related skin tests. Vaccines Patients on prolonged corticosteroid therapy may exhibit a diminished response to toxoids and live or inactivated vaccines due to inhibition of antibody response. Corticosteroids may also potentiate the replication of some organisms contained in live attenuated vaccines.

If possible, defer routine administration of vaccines or toxoids until corticosteroid therapy is discontinued.

Pregnancy Risk Summary There are no data regarding the use of ZILRETTA in pregnant women to inform a drug associated risk of adverse developmental outcomes. Published studies on the association between corticosteroids and fetal outcomes have reported inconsistent findings and have important methodological limitations. The majority of published literature with corticosteroid exposure during pregnancy includes the oral, topical and inhaled dosage formulations; therefore, the applicability of these findings to a single intra-articular injection of triamcinolone acetonide is limited.

In animal reproductive studies from the published literature, pregnant mice, rats, rabbits, or primates administered triamcinolone acetonide during the period of organogenesis at doses that produced exposures less than the maximum recommended human dose (MRHD) caused resorptions, decreased fetal body weight, craniofacial and/or other abnormalities such as omphalocele (see Data ). 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 risk of major birth defects and miscarriage in clinically recognized pregnancies is 2% to 4% and 15% to 20%, respectively.

Data Animal Data The exposure margins listed below are based on body surface area comparisons (mg/m 2 ) to the highest daily triamcinolone acetonide exposure at the MRHD of 32 mg triamcinolone acetonide via ZILRETTA. Pregnant mice dosed with triamcinolone acetonide via intramuscular or subcutaneous injection at doses equivalent to 0.8 times the MRHD or higher during organogenesis caused cleft palate and a higher rate of resorption. In pregnant rats dosed with triamcinolone acetonide via intramuscular or subcutaneous injection at doses equivalent to 0.3 times the MRHD or higher during organogenesis caused developmental abnormality (cleft palate, omphalocele, late resorption, and growth retardation) and fetal mortality. No notable maternal toxicity was observed in rodents.

Pregnant rabbits dosed with triamcinolone acetonide via intramuscular injection for 4 days during organogenesis at doses equivalent to 0.15 times the MRHD or higher caused resorption and cleft palate. No notable maternal toxicity was observed. Pregnant primates dosed with triamcinolone acetonide via intramuscular injection for 4 days during organogenesis at doses equivalent to 3 times the MRHD or higher caused severe craniofacial CNS and skeletal/visceral malformation and higher prenatal death.

No notable maternal toxicity was observed. No peri- and post-natal development studies of triamcinolone acetonide in animals have been conducted.

Pediatric Use The safety and effectiveness of ZILRETTA in pediatric patients have not been established. The adverse effects of corticosteroids in pediatric patients are similar to those in adults. Carefully observe pediatric patients, including weight, height, linear growth, blood pressure, intraocular pressure, and clinical evaluation for the presence of infection, psychosocial disturbances, thromboembolism, peptic ulcers, cataracts, and osteoporosis.

Weigh potential growth effects of treatment against clinical benefits obtained and the availability of treatment alternatives.

is contraindicated in patients who are hypersensitive to triamcinolone acetonide, corticosteroids or any components of the product . Patients with hypersensitivity to triamcinolone acetonide or any component of the product.