2.1 Important Preparation and Administration Instructions

• ZELSUVMI is supplied in a carton containing the following:
  • Tube A containing berdazimer gel
  • Tube B containing hydrogel
  • Dosing guide
• Mix together equal amounts of gel from Tube A and Tube B before application [see Dosage and Administration (2.2)].
• Do not premix or store mixed ZELSUVMI.
• Instruct the patient to refer to the ZELSUVMI “Instructions for Use” for detailed instructions on the preparation and administration of ZELSUVMI [see Instructions for Use].

2.2 Recommended Dosage and Administration

• Dispense equal amounts (0.5 mL) of gel from Tube A and Tube B on the dosing guide.
• Immediately put the caps back on Tube A and Tube B tightly.
• Mix together on the dosing guide.
• Immediately apply ZELSUVMI as an even thin layer. Apply ZELSUVMI once daily to each MC lesion for up to 12 weeks.
• Wash hands after applying ZELSUVMI, unless hands are being treated.
• Allow ZELSUVMI to dry for 10 minutes after application.
• Avoid application to uninvolved skin and avoid transfer of applied ZELSUVMI to other areas, including the eye.
• Avoid swimming, bathing, or washing for 1 hour after application of ZELSUVMI.
• ZELSUVMI is for topical use only and not for ophthalmic, oral, or intravaginal use.

5.1 Application Site Reactions

Application site reactions, including allergic contact dermatitis, have occurred in patients treated with ZELSUVMI. Suspect allergic contact dermatitis in the event of pain, pruritus, swelling or erythema at the application site lasting longer than 24 hours. If allergic contact dermatitis occurs, discontinue ZELSUVMI and initiate appropriate therapy.

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.

In three double-blind, vehicle-controlled clinical trials (Trial 1, and Trial 2 and Trial 3, which were similarly designed to Trial 1), 1596 adult and pediatric subjects were treated with ZELSUVMI or vehicle gel topically once daily for up to 12 weeks [see Clinical Studies (14)]. In these trials 3% of subjects were less than 2 years of age, and 96% of subjects were 2 to 17 years of age. The trial population included 51% male, 88% White, 6% Black, and 6% Other; for ethnicity, 21% of subjects identified as Hispanic/Latino, 78% as non-Hispanic/Latino, and 1% were not reported. Adverse reactions reported by ≥1% of subjects and more frequently than vehicle-treated subjects are listed in Table 1.

8.1 Pregnancy

Risk Summary

There are no available data on ZELSUVMI use in pregnant women to evaluate for a drug-associated risk of major birth defects, miscarriage or other adverse maternal or fetal outcomes. In animal reproduction studies, oral administration of berdazimer to pregnant rats and rabbits increased malformations in the presence of severe maternal toxicity (see Data). The clinical relevance of this finding is unknown given the bioavailability of berdazimer following oral administration is significantly higher than topical application.

The available data do not allow the calculation of relevant comparisons between the systemic exposure of berdazimer observed in animal studies and the systemic exposure that would be expected in humans after topical use of ZELSUVMI.

The 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

Animal Data

Systemic embryo-fetal development studies were conducted in rats and rabbits. In an embryofetal development study in rats, oral dose levels of 28, 95, or 189 mg/kg/day berdazimer were administered during the period of organogenesis. Maternal mortality and elevated methemoglobin levels were noted in dams receiving doses of 95 and 189 mg/kg/day. The maternal no observable adverse effect level (NOAEL) was 28 mg/kg/day. Fetal skeletal malformations (changes in the lumbar and thoracic centra or arches, missing thoracic arches and centra, additional bone in the thoracic arches, missing lumbar centra and arches, and fused ribs) and visceral malformations (cleft palate) and decreased fetal weights were observed in litters from dams receiving 189 mg/kg/day. The fetal NOAEL was 95 mg/kg/day.

In an embryo-fetal development study in rabbits, oral dose levels of 47, 142, or 284 mg/kg/day berdazimer were administered during the period of organogenesis. Maternal mortality, aborted fetuses, adverse clinical observations, and elevated methemoglobin levels were noted in pregnant rabbits receiving doses of 142 and 284 mg/kg/day. The maternal NOAEL was 47 mg/kg/day. Decreased fetal weights were noted from pregnant rabbits receiving 284 mg/kg/day. The fetal NOAEL was 142 mg/kg/day.

8.2 Lactation

Risk Summary

There are no data on the presence of berdazimer or its metabolite in either human or animal milk, the effects on the breastfed infant, or the effects on milk production. The developmental and health benefits of breastfeeding should be considered along with the mother’s clinical need for ZELSUVMI and any potential adverse effects on the breastfed infant from ZELSUVMI or from the underlying maternal condition.

8.4 Pediatric Use

The safety and effectiveness of ZELSUVMI for the topical treatment of MC have been established in pediatric patients 1 year of age and older. Use of ZELSUVMI for this indication is supported by data from three randomized, vehicle-controlled, double-blind trials involving 1596 subjects of which 1575 were pediatric subjects with MC (904 were exposed to ZELSUVMI; 29 subjects were less than 2 years of age, including one subject less than 1 year of age, and 875 were 2 to 17 years of age) [see Clinical Studies (14)].

The safety and effectiveness of ZELSUVMI have not been established in pediatric patients younger than 1 year of age.

8.5 Geriatric Use

Of the total number of ZELSUVMI-treated subjects in clinical studies for MC, none were 65 to 74 years of age, and one was 75 years of age and older [see Clinical Studies (14)]. Clinical studies of ZELSUVMI did not include sufficient numbers of subjects 65 years of age and older to determine whether they respond differently from younger adult subjects.

12.1 Mechanism of Action

ZELSUVMI is a nitric oxide releasing agent. The mechanism of action for the treatment of molluscum contagiosum is unknown.

12.2 Pharmacodynamics

The pharmacodynamics of ZELSUVMI are unknown.

12.3 Pharmacokinetics

Plasma hydrolyzed MAP3 (hMAP3), a structural marker for berdazimer, and nitrate levels were evaluated in n=34 subjects 2 to 12 years of age with MC. Subjects applied ZELSUVMI once-daily for two weeks to a total treatment area of 484 cm2 (mean lesion count=34), applying a mean dose of approximately 3 mL/day. No subjects had quantifiable plasma hMAP3 concentrations on day 1; two subjects had quantifiable concentrations on day 15. Mean plasma nitrate levels were similar on days 1 and 15 and remained relatively flat during the PK sampling period (baseline through 1, 3, and 6 hours post-application).

There were no apparent differences in methemoglobin levels throughout the study.

13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility

The carcinogenic potential of berdazimer gel was assessed in a 2-year dermal mouse carcinogenicity study. There were no drug-related tumor findings associated with daily topical administration of berdazimer gel to mice at doses up to 4% berdazimer gel.

Berdazimer was mutagenic in a bacterial mutagenicity assay (Ames assay) but was not clastogenic in an in vitro chromosomal aberration assay in human peripheral blood lymphocytes or in an in vivo micronucleus assay in rats.

There were no berdazimer related effects on male or female fertility and early embryonic parameters in rats at oral doses up to 189 mg/kg/day.