ZENATANE

INDICATIONS AND USAGE Severe Recalcitrant Nodular Acne Zenatane is indicated for the treatment of severe recalcitrant nodular acne. Nodules are inflammatory lesions with a diameter of 5 mm or greater. The nodules may become suppurative or hemorrhagic. “Severe,” by definition, 2 means “many” as opposed to “few or several” nodules. Because of significant adverse effects associated with its use, Zenatane should be reserved for patients with severe nodular acne who are unresponsive to conventional therapy, including systemic antibiotics. In addition, Zenatane is indicated only for those patients who are not pregnant, because Zenatane can cause life threatening birth defects (see Boxed CONTRAINDICATIONS AND WARNING S ). A single course of therapy for 15 to 20 weeks has been shown to result in complete and prolonged remission of disease in many patients. 1,3,4 If a second course of therapy is needed, it should not be initiated until at least 8 weeks after completion of the first course, because experience has shown that patients may continue to improve while off Zenatane. The optimal interval before retreatment has not been defined for patients who have not completed skeletal growth (see WARNINGS: Skeletal: Bone Mineral Density, Hyperostosis, Premature Epiphyseal Closure ).

DOSAGE AND ADMINISTRATION Zenatane should be administered with a meal (see PRECAUTIONS : Information for Patients ). The recommended dosage range for Zenatane is 0.5 to 1 mg/kg/day given in two divided doses with food for 15 to 20 weeks. In studies comparing 0.1, 0.5, and 1 mg/kg/day, 8 it was found that all dosages provided initial clearing of disease, but there was a greater need for retreatment with the lower dosages. During treatment, the dose may be adjusted according to response of the disease and/or the appearance of clinical side effects — some of which may be dose related. Adult patients whose disease is very severe with scarring or is primarily manifested on the trunk may require dose adjustments up to 2 mg/kg/day, as tolerated. Failure to take Zenatane with food will significantly decrease absorption. Before upward dose adjustments are made, the patients should be questioned about their compliance with food instructions. The safety of once daily dosing with Zenatane has not been established. Once daily dosing is not recommended. If the total nodule count has been reduced by more than 70% prior to completing 15 to 20 weeks of treatment, the drug may be discontinued. After a period of 2 months or more off therapy, and if warranted by persistent or recurring severe nodular acne, a second course of therapy may be initiated. The optimal interval before retreatment has not been defined for patients who have not completed skeletal growth. Long-term use of Zenatane, even in low doses, has not been studied, and is not recommended. It is important that Zenatane be given at the recommended doses for no longer than the recommended duration. The effect of long-term use of Zenatane on bone loss is unknown (see WARNINGS : Skeletal : Bone Mineral Density , Hyperostosis , and Premature Epiphyseal closure ). Contraceptive measures must be followed for any subsequent course of therapy (see PRECAUTIONS ). Table 4 Zenatane Dosing by Body Weight (Based on Administration With Food) Body Weight Total mg/day kilograms pounds 0.5 mg/kg 1 mg/kg 2 mg/kg* 40 88 20 40 80 50 110 25 50 100 60 132 30 60 120 70 154 35 70 140 80 176 40 80 160 90 198 45 90 180 100 220 50 100 200 *See DOSAGE AND ADMINISTRATION : the recommended dosage range is 0.5 to 1 mg/kg/day. INFORMATION FOR PHARMACISTS Access the iPLEDGE REMS system via the internet (www.ipledgeprogram.com), or telephone (1-866495-0654) to obtain an authorization and the “do not dispense to patient after” date. Zenatane must only be dispensed in no more than a 30-day supply. REFILLS REQUIRE A NEW PRESCRIPTION AND A NEW AUTHORIZATION FROM THE iPLEDGE SYSTEM. A Zenatane Medication Guide must be given to the patient each time Zenatane is dispensed, as required by law. This Zenatane Medication Guide is an important part of the risk management program for the patient.

Special Patient Populations Pediatric Patients The pharmacokinetics of isotretinoin were evaluated after single and multiple doses in 38 pediatric patients (12 to 15 years) and 19 adult patients (≥18 years) who received Zenatane for the treatment of severe recalcitrant nodular acne. In both age groups, 4-oxo-isotretinoin was the major metabolite; tretinoin and 4-oxo-tretinoin were also observed. The dose-normalized pharmacokinetic parameters for isotretinoin following single and multiple doses are summarized in Table 3 for pediatric patients. There were no statistically significant differences in the pharmacokinetics of isotretinoin between pediatric and adult patients. Table 3. Pharmacokinetic Parameters of Isotretinoin Following Single and Multiple Dose Administration in Pediatric Patients, 12 to 15 Years of Age Mean ( ± SD), N=38* Parameter Isotretinoin(Single Dose) Isotretinoin(Steady-State) C max (ng/mL) 573.25 (278.79) 731.98 (361.86) AUC (0-12) (ng⋅hr/mL) 3033.37 (1394.17) 5082 (2184.23) AUC (0-24) (ng⋅hr/mL) 6003.81 (2885.67) – T max (hr)† 6 (1 to 24.6) 4 (0 to12) C ssmin (ng/mL) – 352.32 (184.44) T 1/2 (hr) – 15.69 (5.12) CL/F (L/hr) – 17.96 (6.27) *The single and multiple dose data in this table were obtained following a non-standardized meal that is not comparable to the high-fat meal that was used in the study in Table 2 . † Median (range) In pediatric patients (12 to 15 years), the mean ± SD elimination half-lives (t 1/2 ) of isotretinoin and 4-oxo-isotretinoin were 15.7 ± 5.1 hours and 23.1 ± 5.7 hours, respectively. The accumulation ratios of isotretinoin ranged from 0.46 to 3.65 for pediatric patients. WARNINGS Psychiatric Disorders Zenatane may cause depression, psychosis and, rarely, suicidal ideation, suicide attempts, suicide, and aggressive and/or violent behaviors. No mechanism of action has been established for these events (see ADVERSE REACTIONS: Psychiatric). Prescribers should read the brochure, Recognizing Psychiatric Disorders in Adolescents and Young Adults : A Guide for Prescribers of Isotretinoin . Prescribers should be alert to the warning signs of psychiatric disorders to guide patients to receive the help they need. Therefore, prior to initiation of Zenatane therapy, patients and family members should be asked about any history of psychiatric disorder, and at each visit during therapy patients should be assessed for symptoms of depression, mood disturbance, psychosis, or aggression to determine if further evaluation may be necessary. Signs and symptoms of depression, as described in the brochure (“Recognizing Psychiatric Disorders in Adolescents and Young Adults”), include sad mood, hopelessness, feelings of guilt, worthlessness or helplessness, loss of pleasure or interest in activities, fatigue, difficulty concentrating, change in sleep pattern, change in weight or appetite, suicidal thoughts or attempts, restlessness, irritability, acting on dangerous impulses, and persistent physical symptoms unresponsive to treatment. Patients should stop Zenatane and the patient or a family member should promptly contact their prescriber if the patient develops depression, mood disturbance, psychosis, or aggression, without waiting until the next visit. Discontinuation of Zenatane therapy may be insufficient; further evaluation may be necessary. While such monitoring may be helpful, it may not detect all patients at risk. Patients may report mental health problems or family history of psychiatric disorders. These reports should be discussed with the patient and/or the patient’s family. A referral to a mental health professional may be necessary. The physician should consider whether Zenatane therapy is appropriate in this setting; for some patients the risks may outweigh the benefits of Zenatane therapy. Pseudotumor Cerebri Zenatane use has been associated with a number of cases of pseudotumor cerebri (benign intracranial hypertension), some of which involved concomitant use of tetracyclines. Concomitant…

CONTRAINDICATIONS Pregnancy: Category X. See Boxed CONTRAINDICATIONS AND WARNINGS . Allergic Reactions Zenatane is contraindicated in patients who are hypersensitive to this medication or to any of its components (see PRECAUTIONS: Hypersensitivity).

Drug Interactions Drug Interactions Vitamin A: Because of the relationship of Zenatane to vitamin A, patients should be advised against taking vitamin supplements containing vitamin A to avoid additive toxic effects. Tetracyclines: Concomitant treatment with Zenatane and tetracyclines should be avoided because Zenatane use has been associated with a number of cases of pseudotumor cerebri (benign intracranial hypertension), some of which involved concomitant use of tetracyclines. Micro-dosed Progesterone Preparations: Micro-dosed progesterone preparations (“minipills” that do not contain an estrogen) may be an inadequate method of contraception during Zenatane therapy. Although other hormonal contraceptives are highly effective, there have been reports of pregnancy from patients who can become pregnant who have used combined oral contraceptives, as well as transdermal patch/injectable/implantable/vaginal ring hormonal birth control products. These reports are more frequent for patients who can become pregnant who use only a single form of contraception. It is not known if hormonal contraceptives differ in their effectiveness when used with Zenatane. Therefore, it is critically important for patients who can become pregnant to select and commit to use two forms of effective contraception simultaneously, at least one of which must be a primary form (see PRECAUTIONS ). Norethindrone/ethinyl estradiol: In a study of 31 premenopausal female patients with severe recalcitrant nodular acne receiving Ortho-Novum ® 7/7/7 Tablets as an oral contraceptive agent, Zenatane at the recommended dose of 1 mg/kg/day, did not induce clinically relevant changes in the pharmacokinetics of ethinyl estradiol and norethindrone and in the serum levels of progesterone, follicle-stimulating hormone (FSH) and luteinizing hormone (LH). Prescribers are advised to consult the package insert of medication administered concomitantly with hormonal contraceptives, since some medications may decrease the effectiveness of these birth control products. St. John’s Wort: Zenataneuse is associated with depression in some patients (see WARNINGS : Psychiatric Disorders and ADVERSE REACTIONS : Psychiatric). Patients should be prospectively cautioned not to self-medicate with the herbal supplement St. John’s Wort because a possible interaction has been suggested with hormonal contraceptives based on reports of breakthrough bleeding on oral contraceptives shortly after starting St.John's Wort. Pregnancies have been reported by users of combined hormonal contraceptives who also used some form of St.John's Wort. Phenytoin: Zenatane has not been shown to alter the pharmacokinetics of phenytoin in a study in seven healthy volunteers. These results are consistent with the in vitro finding that neither isotretinoin nor its metabolites induce or inhibit the activity of the CYP 2C9 human hepatic P450 enzyme. Phenytoin is known to cause osteomalacia. No formal clinical studies have been conducted to assess if there is an interactive effect on bone loss between phenytoin and Zenatane. Therefore, caution should be exercised when using these drugs together. Systemic Corticosteroids: Systemic corticosteroids are known to cause osteoporosis. No formal clinical studies have been conducted to assess if there is an interactive effect on bone loss between systemic corticosteroids and Zenatane. Therefore, caution should be exercised when using these drugs together.

Pregnancy: Category X. See Boxed CONTRAINDICATIONS AND WARNINGS.

Nursing Mothers It is not known whether this drug is excreted in human milk. Because of the potential for adverse effects, nursing mothers should not receive Zenatane.

ADVERSE REACTIONS Clinical Trials and Postmarketing Surveillance The adverse reactions listed below reflect the experience from investigational studies of Zenatane, and the postmarketing experience. The relationship of some of these events to Zenatane therapy is unknown. Many of the side effects and adverse reactions seen in patients receiving Zenatane are similar to those described in patients taking very high doses of vitamin A (dryness of the skin and mucous membranes, e.g., of the lips, nasal passage, and eyes). Dose Relationship Cheilitis and hypertriglyceridemia are usually dose related. Most adverse reactions reported in clinical trials were reversible when therapy was discontinued; however, some persisted after cessation of therapy (see WARNINGS and ADVERSE REACTIONS ). Body as a Whole allergic reactions, including vasculitis, systemic hypersensitivity (see PRECAUTIONS : Hypersensitivity ), edema, fatigue, lymphadenopathy, weight loss Cardiovascular palpitation, tachycardia, vascular thrombotic disease, stroke Endocrine/Metabolic hypertriglyceridemia (see WARNINGS : Lipids ), alterations in blood sugar levels (see PRECAUTIONS : Laboratory Tests ). Gastrointestinal inflammatory bowel disease (see WARNINGS : Inflammatory Bowel Disease ), hepatitis (see WARNINGS : Hepatotoxicity ), pancreatitis (see WARNINGS : Lipids ), bleeding and inflammation of the gums, colitis, esophagitis/esophageal ulceration, ileitis, nausea, other nonspecific gastrointestinal symptoms. Hematologic allergic reactions (see PRECAUTIONS : Hypersensitivity ), anemia, thrombocytopenia, neutropenia, rare reports of agranulocytosis (see PRECAUTIONS : Information for Patients ). See PRECAUTIONS : Laboratory Tests for other hematological parameters. Musculoskeletal skeletal hyperostosis, calcification of tendons and ligaments, premature epiphyseal closure, decreases in bone mineral density (see WARNINGS : Skeletal ), musculoskeletal symptoms (sometimes severe) including back pain, myalgia, and arthralgia (see PRECAUTIONS : Information for Patients ), transient pain in the chest (see PRECAUTIONS : Information for Patients ), arthritis, tendonitis, other types of bone abnormalities, elevations of CPK/rare reports of rhabdomyolysis (see PRECAUTIONS : Laboratory Tests ). Neurological pseudotumor cerebri (see WARNINGS : Pseudotumor Cerebri ), dizziness, drowsiness, headache, insomnia, lethargy, malaise, nervousness, paresthesias, seizures, stroke, syncope, weakness. Psychiatric suicidal ideation, suicide attempts, suicide, depression, psychosis, aggression, violent behaviors (see WARNINGS : Psychiatric Disorders ), emotional instability. Of the patients reporting depression, some reported that the depression subsided with discontinuation of therapy and recurred with reinstitution of therapy. Reproductive System abnormal menses. Respiratory bronchospasms (with or without a history of asthma), respiratory infection, voice alteration Skin and Appendages acne fulminans, alopecia (which in some cases persists), bruising, cheilitis (dry lips), dry mouth, dry nose, dry skin, epistaxis, eruptive xanthomas, 7 erythema multiforme, flushing, fragility of skin, hair abnormalities, hirsutism, hyperpigmentation and hypopigmentation, infections (including disseminated herpes simplex), nail dystrophy, paronychia, peeling of palms and soles, photoallergic/photosensitizing reactions, pruritus, pyogenic granuloma, rash (including facial erythema, seborrhea, and eczema), Stevens-Johnson syndrome, sunburn susceptibility increased, sweating, toxic epidermal necrolysis, urticaria, vasculitis (including Wegener’s granulomatosis; see PRECAUTIONS : Hypersensitivity ), abnormal wound healing (delayed healing or exuberant granulation tissue with crusting; see PRECAUTIONS : Information for Patients ) Special Senses Hearing hearing impairment (see WARNINGS : Hearing Impairment ), tinnitus. Vision corneal opacities (see WARNINGS : Corneal Opacities ), decreased night vision which may persis…