WARNINGS
Included as part of the "PRECAUTIONS" Section
PRECAUTIONS
Local Inflammatory Reactions
Intense local inflammatory reactions including skin weeping or erosion can occur after few applications
of Aldara Cream and may require an interruption of dosing [see DOSAGE AND ADMINISTRATION and ADVERSE REACTIONS]. Aldara Cream has the potential to exacerbate inflammatory conditions of the skin,
including chronic graft versus host disease.
Severe local inflammatory reactions of the female external genitalia can lead to severe vulvar swelling.
Severe vulvar swelling can lead to urinary retention. Dosing should be interrupted or discontinued for
severe vulvar swelling.
Administration of Aldara Cream is not recommended until the skin is completely healed from any
previous drug or surgical treatment.
Systemic Reactions
Flu-like signs and symptoms may accompany, or even precede, local inflammatory reactions and may
include malaise, fever, nausea, myalgias and rigors. An interruption of dosing should be considered [see ADVERSE REACTIONS].
Ultraviolet Light Exposure
Exposure to sunlight (including sunlamps) should be avoided or minimized during use of Aldara Cream
because of concern for heightened sunburn susceptibility. Patients should be warned to use protective
clothing (e.g., a hat) when using Aldara Cream. Patients with sunburn should be advised not to use
Aldara Cream until fully recovered. Patients who may have considerable sun exposure, e.g., due to their
occupation, and those patients with inherent sensitivity to sunlight should exercise caution when using
Aldara Cream.
Aldara Cream shortened the time to skin tumor formation in an animal photoco-carcinogenicity study
[see Nonclinical Toxicology]. The enhancement of ultraviolet carcinogenicity is not necessarily
dependent on phototoxic mechanisms. Therefore, patients should minimize or avoid natural or artificial
sunlight exposure.
Unevaluated Uses
Actinic Keratosis
Safety and efficacy have not been established for Aldara Cream in the treatment of actinic keratosis with
repeated use, i.e. more than one treatment course, in the same area.
The safety of Aldara Cream applied to areas of skin greater than 25 cm2 (e.g., 5 cm × 5 cm) for the
treatment of actinic keratosis has not been established [see CLINICAL PHARMACOLOGY].
Unevaluated Uses
Superficial Basal Cell Carcinoma
The safety and efficacy of Aldara Cream have not been established for other types of basal cell
carcinomas (BCC), including nodular and morpheaform (fibrosing or sclerosing) types. Aldara Cream
is not recommended for treatment of BCC s ubtypes other than the s uperficial variant (i.e.,
s BCC). Patients with sBCC treated with Aldara Cream should have regular follow-up of the treatment
site [see Clinical Studies].
The safety and efficacy of treating sBCC lesions on the face, head and anogenital area have not been
established.
Unevaluated Uses
External Genital Warts
Aldara Cream has not been evaluated for the treatment of urethral, intra-vaginal, cervical, rectal, or
intra-anal human papilloma viral disease.
Patient Counseling Information
See FDA-Approved Patient Labeling
General Information
All Indications
Aldara Cream should be used as directed by a physician [see DOSAGE AND ADMINISTRATION]. Aldara
Cream is for external use only. Contact with the eyes, lips and nostrils should be avoided [see INDICATIONS AND USAGE and DOSAGE AND ADMINISTRATION]. The treatment area should not be bandaged
or otherwise occluded. Partially-used packets should be discarded and not reused. The prescriber
should demonstrate the proper application technique to maximize the benefit of Aldara Cream therapy.
It is recommended that patients wash their hands before and after applying Aldara cream.
Local Skin Reactions
All Indications
Patients may experience local skin reactions during treatment with Aldara Cream (even with normal
dosing). Potential local skin reactions include erythema, edema, vesicles, erosions/ulcerations,
weeping/exudate, flaking/scaling/dryness, and scabbing/crusting. These reactions can range from mild
to severe in intensity and may extend beyond the application site onto the surrounding skin. Patients may
also experience application site reactions such as itching and/or burning [see ADVERSE REACTIONS].
Local skin reactions may be of such intensity that patients may require rest periods from treatment.
Treatment with Aldara Cream can be resumed after the skin reaction has subsided, as determined by the
physician. Patients should contact their physician promptly if they experience any sign or symptom at the
application site that restricts or prohibits their daily activity or makes continued application of the cream
difficult.
Because of local skin reactions, during treatment and until healed, the treatment area is likely to appear
noticeably different from normal skin. Localized hypopigmentation and hyperpigmentation have been
reported following use of Aldara Cream. These skin color changes may be permanent in some patients.
Systemic Reactions
All Indications
Patients may experience flu-like systemic signs and symptoms during treatment with Aldara Cream (even
with normal dosing). Systemic signs and symptoms may include malaise, fever, nausea, myalgias and
rigors [see ADVERSE REACTIONS]. An interruption of dosing should be considered.
Patients Being Treated For Actinic Keratosis (AK)
Dosing is 2 times per week for a full 16 weeks, unless otherwise directed by the physician. However,
the treatment period should not be extended beyond 16 weeks due to missed doses or rest periods [see DOSAGE AND ADMINISTRATION].
It is recommended that the treatment area be washed with mild soap and water 8 hours following Aldara
Cream application.
Most patients using Aldara Cream for the treatment of AK experience erythema, flaking/scaling/dryness
and scabbing/crusting at the application site with normal dosing [see ADVERSE REACTIONS].
Use of sunscreen is encouraged, and patients should minimize or avoid exposure to natural or artificial
sunlight (tanning beds or UVA/B treatment) while using Aldara Cream [see WARNINGS AND PRECAUTIONS].
Sub-clinical AK lesions may become apparent in the treatment area during treatment and may
subsequently resolve [see Clinical Studies].
Patients Being Treated For Superficial Basal Cell Carcinoma (sBCC)
Dosing is 5 times per week for a full 6 weeks, unless otherwise directed by the physician. However,
the treatment period should not be extended beyond 6 weeks due to missed doses or rest periods [see DOSAGE AND ADMINISTRATION].
It is recommended that the treatment area be washed with mild soap and water 8 hours following Aldara
Cream application [see DOSAGE AND ADMINISTRATION].
Most patients using Aldara Cream for the treatment of sBCC experience erythema, edema, induration,
erosion, scabbing/crusting and flaking/scaling at the application site with normal dosing [see ADVERSE REACTIONS].
Use of sunscreen is encouraged, and patients should minimize or avoid exposure to natural or artificial
sunlight (tanning beds or UVA/B treatment) while using Aldara Cream [see WARNINGS AND PRECAUTIONS].
The clinical outcome of therapy can be determined after resolution of application site reactions and/or
local skin reactions.
Patients with sBCC treated with Aldara Cream should have regular follow-up to re-evaluate the
treatment site [see Clinical Studies].
Patients Being Treated For External Genital Warts
Dosing is 3 times per week to external genital/perianal warts. Aldara Cream treatment should continue
until there is total clearance of the genital/perianal warts or for a maximum of 16 weeks.
It is recommended that the treatment area be washed with mild soap and water 6–10 hours following
Aldara Cream application.
It is common for patients to experience local skin reactions such as erythema, erosion,
excoriation/flaking, and edema at the site of application or surrounding areas. Most skin reactions are
mild to moderate.
Sexual (genital, anal, oral) contact should be avoided while Aldara Cream is on the skin. Application of
Aldara Cream in the vagina is considered internal and should be avoided. Female patients should take
special care if applying the cream at the opening of the vagina because local skin reactions on the
delicate moist surfaces can result in pain or severe swelling, and may cause difficulty in passing urine,
or inability to urinate.
Uncircumcised males treating warts under the foreskin should retract the foreskin and clean the area
daily.
New warts may develop during therapy, as Aldara Cream is not a cure.
The effect of Aldara Cream on the transmission of genital/perianal warts is unknown.
Aldara Cream may weaken condoms and vaginal diaphragms; therefore, concurrent use is not
recommended.
Should severe local skin reaction occur, the cream should be removed by washing the treatment area
with mild soap and water.
Nonclinical Toxicology
Carcinogenesis, Mutagenesis, Impairment Of Fertility
In an oral (gavage) rat carcinogenicity study, imiquimod was administered to Wistar rats on a 2×/week
(up to 6 mg/kg/day) or daily (3 mg/kg/day) dosing schedule for 24 months. No treatment related tumors
were noted in the oral rat carcinogenicity study up to the highest doses tested in this study of 6 mg/kg
administered 2×/week in female rats (87× MRHD based on weekly AUC comparisons), 4 mg/kg
administered 2×/week in male rats (75× MRHD based on weekly AUC comparisons) or 3 mg/kg
administered 7×/week to male and female rats (153× MRHD based on weekly AUC comparisons).
In a dermal mouse carcinogenicity study, imiquimod cream (up to 5 mg/kg/application imiquimod or
0.3% imiquimod cream) was applied to the backs of mice 3×/week for 24 months. A statistically
significant increase in the incidence of liver adenomas and carcinomas was noted in high dose male
mice compared to control male mice (251× MRHD based on weekly AUC comparisons). An increased
number of skin papillomas was observed in vehicle cream control group animals at the treated site only.
The quantitative composition of the vehicle cream used in the dermal mouse carcinogenicity study is the
same as the vehicle cream used for Aldara Cream, minus the active moiety (imiquimod).
In a 52-week dermal photoco-carcinogenicity study, the median time to onset of skin tumor formation
was decreased in hairless mice following chronic topical dosing (3×/week; 40 weeks of treatment
followed by 12 weeks of observation) with concurrent exposure to UV radiation (5 days per week) with
the Aldara Cream vehicle alone. No additional effect on tumor development beyond the vehicle effect
was noted with the addition of the active ingredient, imiquimod, to the vehicle cream.
Imiquimod revealed no evidence of mutagenic or clastogenic potential based on the results of five in
vitro genotoxicity tests (Ames assay, mouse lymphoma L5178Y assay, Chinese hamster ovary cell
chromosome aberration assay, human lymphocyte chromosome aberration assay and SHE cell
transformation assay) and three in vivo genotoxicity tests (rat and hamster bone marrow cytogenetics
assay and a mouse dominant lethal test).
Daily oral administration of imiquimod to rats, throughout mating, gestation, parturition and lactation,
demonstrated no effects on growth, fertility or reproduction, at doses up to 87× MRHD based on AUC
comparisons.
Use In Specific Populations
Pregnancy
Pregnancy Category C
Note: The Maximum Recommended Human Dose (MRHD) was set at 2 packets per treatment of Aldara
Cream (25 mg imiquimod) for the animal multiple of human exposure ratios presented in this label. If
higher doses than 2 packets of Aldara Cream are used clinically, then the animal multiple of human
exposure would be reduced for that dose. A non-proportional increase in systemic exposure with
increased dose of Aldara Cream was noted in the clinical pharmacokinetic study conducted in actinic
keratosis subjects [see CLINICAL PHARMACOLOGY]. The AUC after topical application of 6 packets of
Aldara Cream was 8 fold greater than the AUC after topical application of 2 packets of Aldara Cream in
actinic keratosis subjects. Therefore, if a dose of 6 packets per treatment of Aldara Cream was
topically administered to an individual, then the animal multiple of human exposure would be either 1/3
of the value provided in the label (based on body surface area comparisons) or 1/8 of the value
provided in the label (based on AUC comparisons). The animal multiples of human exposure
calculations were based on weekly dose comparisons for the carcinogenicity studies described in this
label. The animal multiples of human exposure calculations were based on daily dose comparisons for
the reproductive toxicology studies described in this label.
Systemic embryofetal development studies were conducted in rats and rabbits. Oral doses of 1, 5 and 20
mg/kg/day imiquimod were administered during the period of organogenesis (gestational days 6–15) to
pregnant female rats. In the presence of maternal toxicity, fetal effects noted at 20 mg/kg/day (577×
MRHD based on AUC comparisons) included increased resorptions, decreased fetal body weights,
delays in skeletal ossification, bent limb bones, and two fetuses in one litter (2 of 1567 fetuses)
demonstrated exencephaly, protruding tongues and low-set ears. No treatment related effects on
embryofetal toxicity or teratogenicity were noted at 5 mg/kg/day (98× MRHD based on AUC
comparisons).
Intravenous doses of 0.5, 1 and 2 mg/kg/day imiquimod were administered during the period of
organogenesis (gestational days 6–18) to pregnant female rabbits. No treatment related effects on
embryofetal toxicity or teratogenicity were noted at 2 mg/kg/day (1.5× MRHD based on BSA
comparisons), the highest dose evaluated in this study, or 1 mg/kg/day (407× MRHD based on AUC
comparisons).
A combined fertility and peri- and post-natal development study was conducted in rats. Oral doses of 1,
1.5, 3 and 6 mg/kg/day imiquimod were administered to male rats from 70 days prior to mating through
the mating period and to female rats from 14 days prior to mating through parturition and lactation. No
effects on growth, fertility, reproduction or post-natal development were noted at doses up to 6
mg/kg/day (87× MRHD based on AUC comparisons), the highest dose evaluated in this study. In the
absence of maternal toxicity, bent limb bones were noted in the F1 fetuses at a dose of 6 mg/kg/day (87×
MRHD based on AUC comparisons). This fetal effect was also noted in the oral rat embryofetal
development study conducted with imiquimod. No treatment related effects on teratogenicity were noted
at 3 mg/kg/day (41× MRHD based on AUC comparisons).
There are no adequate and well-controlled studies in pregnant women. Aldara Cream should be used
during pregnancy only if the potential benefit justifies the potential risk to the fetus.
Nursing Mothers
It is not known whether imiquimod is excreted in human milk following use of Aldara Cream. Because
many drugs are excreted in human milk, caution should be exercised when Aldara Cream is administered
to nursing women.
Pediatric Use
AK and sBCC are not conditions generally seen within the pediatric population. The safety and efficacy
of Aldara Cream for AK or sBCC in patients less than 18 years of age have not been established.
Safety and efficacy in patients with external genital/perianal warts below the age of 12 years have not
been established.
Aldara Cream was evaluated in two randomized, vehicle-controlled, double-blind trials involving 702
pediatric subjects with molluscum contagiosum (MC) (470 exposed to Aldara; median age 5 years,
range 2–12 years). Subjects applied Aldara Cream or vehicle 3 times weekly for up to 16 weeks.
Complete clearance (no MC lesions) was assessed at Week 18. In Study 1, the complete clearance rate
was 24% (52/217) in the Aldara Cream group compared with 26% (28/106) in the vehicle group. In
Study 2, the clearance rates were 24% (60/253) in the Aldara Cream group compared with 28% (35/126)
in the vehicle group. These studies failed to demonstrate efficacy.
Similar to the studies conducted in adults, the most frequently reported adverse reaction from 2 studies
in children with molluscum contagiosum was application site reaction. Adverse events which occurred
more frequently in Aldara-treated subjects compared with vehicle-treated subjects generally resembled
those seen in studies in indications approved for adults and also included otitis media (5% Aldara vs.
3% vehicle) and conjunctivitis (3% Aldara vs. 2% vehicle).
Erythema was the most frequently reported local skin reaction. Severe local skin reactions reported by
Aldara-treated subjects in the pediatric studies included erythema (28%), edema (8%), scabbing/crusting
(5%), flaking/scaling (5%), erosion (2%) and weeping/exudate (2%).
Systemic absorption of imiquimod across the affected skin of 22 subjects aged 2 to 12 years with
extensive MC involving at least 10% of the total body surface area was observed after single and
multiple doses at a dosing frequency of 3 applications per week for 4 weeks. The investigator
determined the dose applied, either 1, 2 or 3 packets per dose, based on the size of the treatment area
and the subject's weight. The overall median peak serum drug concentrations at the end of week 4 was
between 0.26 and 1.06 ng/mL except in a 2-year old female who was administered 2 packets of study
drug per dose, had a Cmax of 9.66 ng/mL after multiple dosing. Children aged 2–5 years received doses
of 12.5 mg (one packet) or 25 mg (two packets) of imiquimod and had median multiple-dose peak serum
drug levels of approximately 0.2 or 0.5 ng/mL, respectively. Children aged 6–12 years received doses
of 12.5 mg, 25 mg, or 37.5 mg (three packets) and had median multiple dose serum drug levels of
approximately 0.1, 0.15, or 0.3 ng/mL, respectively. Among the 20 subjects with evaluable laboratory
assessments, the median WBC count decreased by 1.4*10 /L and the median absolute neutrophil count
decreased by 1.42*10 /L.
Geriatric Use
Of the 215 subjects treated with Aldara Cream in the AK clinical studies, 127 subjects (59%) were 65
years and older, while 60 subjects (28%) were 75 years and older. Of the 185 subjects treated with
Aldara Cream in the sBCC clinical studies, 65 subjects (35%) were 65 years and older, while 25
subjects (14%) were 75 years and older. No overall differences in safety or effectiveness were
observed between these subjects and younger subjects. No other clinical experience has identified
differences in responses between the elderly and younger subjects, but greater sensitivity of some
older individuals cannot be ruled out.