Pimecrolimus Cream, 1% is not indicated for use in children less than 2 years of age.
The long-term safety and effects of Pimecrolimus Cream, 1% on the developing immune system are unknown.
Three Phase 3 pediatric trials were conducted involving 1114 subjects 2-17 years of age. Two trials were 6-week randomized vehicle-controlled trials with a 20-week open-label phase and one was a vehicle-controlled (up to 1 year) safety trial with the option for sequential topical corticosteroid use. Of these subjects, 542 (49%) were 2-6 years of age. In the short-term trials, 11% of Pimecrolimus subjects did not complete these trials and 1.5% of Pimecrolimus subjects discontinued due to adverse events. In the 1-year trial, 32% of Pimecrolimus subjects did not complete this trial and 3% of Pimecrolimus subjects discontinued due to adverse events. Most discontinuations were due to unsatisfactory therapeutic effect.
The most common local adverse event in the short-term trials of Pimecrolimus Cream, 1% in pediatric subjects ages 2-17 was application site burning (10% vs. 13% vehicle); the incidence in the long-term trial was 9% Pimecrolimus vs. 7% vehicle [see Adverse Reactions (6.1)]. Adverse events that were more frequent (>5%) in subjects treated with Pimecrolimus Cream, 1% compared to vehicle were headache (14% vs. 9%) in the short-term trial. Nasopharyngitis (26% vs. 21%), influenza (13% vs. 4%), pharyngitis (8% vs. 3%), viral infection (7% vs. 1%), pyrexia (13% vs. 5%), cough (16% vs. 11%), and headache (25% vs. 16%) were increased over vehicle in the 1-year safety trial [see Adverse Reactions (6.1)]. In 843 subjects ages 2-17 years treated with Pimecrolimus Cream, 1%, 9 (0.8%) developed eczema herpeticum (5 on Pimecrolimus Cream, 1% alone and 4 on Pimecrolimus Cream, 1% used in sequence with corticosteroids). In 211 subjects on vehicle alone, there were no cases of eczema herpeticum. The majority of adverse events were mild to moderate in severity.
Two Phase 3 trials were conducted involving 436 infants age 3 months-23 months. One 6-week randomized vehicle-controlled trial with a 20-week open-label phase and one safety trial, up to one year, were conducted. In the 6-week trial, 11% of Pimecrolimus and 48% of vehicle subjects did not complete this trial; no subject in either group discontinued due to adverse events. Infants on Pimecrolimus Cream, 1% had an increased incidence of some adverse events compared to vehicle. In the 6-week vehicle-controlled trial, these adverse events included pyrexia (32% vs. 13% vehicle), URI (24% vs. 14%), nasopharyngitis (15% vs. 8%), gastroenteritis (7% vs. 3%), otitis media (4% vs. 0%), and diarrhea (8% vs. 0%). In the open-label phase of the trial, for infants who switched to Pimecrolimus Cream, 1% from vehicle, the incidence of the above-cited adverse events approached or equaled the incidence of those subjects who remained on Pimecrolimus Cream, 1%. In the 6-month safety data, 16% of Pimecrolimus and 35% of vehicle subjects discontinued early and 1.5% of Pimecrolimus and 0% of vehicle subjects discontinued due to adverse events. Infants on Pimecrolimus Cream, 1% had a greater incidence of some adverse events as compared to vehicle. These included pyrexia (30% vs. 20%), URI (21% vs. 17%), cough (15% vs. 9%), hypersensitivity (8% vs. 2%), teething (27% vs. 22%), vomiting (9% vs. 4%), rhinitis (13% vs. 9%), viral rash (4% vs. 0%), rhinorrhea (4% vs. 0%), and wheezing (4% vs. 0%).
The systemic exposure to pimecrolimus from Pimecrolimus Cream, 1% was investigated in 28 pediatric subjects with atopic dermatitis (20%-80% BSA involvement) between the ages of 8 months-14 years. Following twice daily application for 3 weeks, blood concentrations of pimecrolimus were <2 ng/mL with 60% (96/161) of the blood samples having blood concentration below the limit of quantification (0.5 ng/mL). However, more children (23 children out of the total 28 children investigated) had at least one detectable blood level as compared to the adults (12 adults out of the total 52 adults investigated) over a 3-week treatment period. Due to the erratic nature of the blood levels observed, no correlation could be made between amount of cream, degree of BSA involvement, and blood concentrations. In general, the blood concentrations measured in adult atopic dermatitis subjects were comparable to those seen in the pediatric population.
In a second group of 30 pediatric subjects aged 3-23 months with 10%-92% BSA involvement, following twice daily application for 3 weeks, blood concentrations of pimecrolimus were <2.6 ng/mL with 65% (75/116) of the blood samples having blood concentration below 0.5 ng/mL, and 27% (31/116) below the limit of quantification (0.1 ng/mL) for these trials.
Overall, a higher proportion of detectable blood levels was seen in the pediatric subject population as compared to adult population. This increase in the absolute number of positive blood levels may be due to the larger surface area to body mass ratio seen in these younger subjects. In addition, a higher incidence of upper respiratory symptoms/infections was also seen relative to the older age group in the PK trials. At this time, a causal relationship between these findings and Pimecrolimus use cannot be ruled out.