Effects on Calcium Metabolism
Hypercalcemia and hypercalciuria have been observed with use of Taclonex Scalp® Topical Suspension. If hypercalcemia or hypercalciuria develop, treatment should be discontinued until parameters of calcium metabolism have normalized. The effects of Taclonex Scalp® Topical Suspension on calcium metabolism following treatment durations of more than 8 weeks have not been evaluated.
Effects on Endocrine System
Systemic absorption of topical corticosteroids can produce reversible hypothalamic- pituitary-adrenal (HPA) axis suppression with the potential for clinical glucocorticosteroid insufficiency. This may occur during treatment or upon withdrawal of the topical corticosteroid.
In a study of 32 subjects treated with Taclonex Scalp® Topical Suspension
on the scalp and Taclonex® Ointment on the body, adrenal suppression was
identified in 5 of 32 subjects (15.6%) after 4 weeks of treatment and in 2 of
11 subjects (18.2%) who continued treatment for 8 weeks. [See CLINICAL
PHARMACOLOGY, Pharmacodynamics]
Because of the potential for systemic absorption, use of topical corticosteroids may require that patients be periodically evaluated for HPA axis suppression. Factors that predispose a patient using a topical corticosteroid to HPA axis suppression include the use of more potent steroids, use over large surface areas, use over prolonged periods, use under occlusion, use on an altered skin barrier, and use in patients with liver failure.
An ACTH stimulation test may be helpful in evaluating patients for HPA axis suppression. If HPA axis suppression is documented, an attempt should be made to gradually withdraw the drug, to reduce the frequency of application, or to substitute a less potent steroid. Manifestations of adrenal insufficiency may require supplemental systemic corticosteroids. Recovery of HPA axis function is generally prompt and complete upon discontinuation of topical corticosteroids.
Cushing's syndrome, hyperglycemia, and unmasking of latent diabetes mellitus can also result from systemic absorption of topical corticosteroids.
Use of more than one corticosteroid-containing product at the same time may increase the total systemic corticosteroid exposure.
Pediatric patients may be more susceptible to systemic toxicity from use of
topical corticosteroids. [See Use in Specific Populations]
Local Adverse Reactions with Topical Corticosteroids
Local adverse reactions may be more likely to occur with occlusive use, prolonged use or use of higher potency corticosteroids. Reactions may include atrophy, striae, telangiectasias, burning, itching, irritation, dryness, folliculitis, acneiform eruptions, hypopigmentation, perioral dermatitis, allergic contact dermatitis, secondary infection, and miliaria. Some local adverse reactions may be irreversible.
Allergic Contact Dermatitis with Topical Corticosteroids
Allergic contact dermatitis to any component of topical corticosteroids is usually diagnosed by a failure to heal rather than a clinical exacerbation. Clinical diagnosis of allergic contact dermatitis can be confirmed by patch testing.
Allergic Contact Dermatitis with Topical Calcipotriene
Allergic contact dermatitis has been observed with use of topical calcipotriene. Clinical diagnosis of allergic contact dermatitis can be confirmed by patch testing.
Concomitant Skin Infections
Concomitant skin infections should be treated with an appropriate antimicrobial agent. If the infection persists, Taclonex Scalp® Topical Suspension should be discontinued until the infection has been adequately treated.
Unevaluated Uses
The safety and efficacy of Taclonex Scalp® Topical Suspension in patients with known or suspected disorders of calcium metabolism have not been evaluated.
The safety and efficacy of Taclonex Scalp® Topical Suspension in patients with erythrodermic, exfoliative or pustular psoriasis have not been evaluated.
The safety and efficacy of Taclonex Scalp® Topical Suspension in patients with severe renal insufficiency or severe hepatic disorders have not been evaluated.
Eye Exposures
Avoid eye exposures. Taclonex Scalp® Topical Suspension may cause eye irritation.
Ultraviolet Light Exposures
Patients who apply Taclonex Scalp® Topical Suspension to exposed skin (e.g. a bald scalp) should avoid excessive exposure to either natural or artificial sunlight, including tanning booths, sun lamps, etc. Physicians may wish to limit or avoid use of phototherapy to the scalp in patients who use Taclonex Scalp® Topical Suspension.
Patient Counseling Information
This information is intended to aid in the safe and effective use of this medication. It is not a disclosure of all possible adverse or intended effects.
Patients using Taclonex Scalp® Topical Suspension should receive the following information and instructions.
Instructions for Use
This medication is to be used as directed by the physician. It is for external use only. Avoid contact with the face or eyes. As with any topical medication, patients should wash hands after application. This medication should not be used for any disorder other than that for which it has been prescribed. The treated skin area should not be bandaged or otherwise covered as to be occlusive, unless directed by the physician.
Adverse Reactions
Patients should report any signs of adverse reactions to their physician.
Concomitant Use of Other Corticosteroids
Other products containing calcipotriene or a corticosteroid should not be used with Taclonex Scalp® Topical Suspension without first talking to the physician.
Excessive Exposure to Light
Patients who use Taclonex Scalp® Topical Suspension should avoid excessive exposure to either natural or artificial sunlight (including tanning booths, sun lamps, etc.). Physicians may wish to limit or avoid use of phototherapy in patients who use Taclonex Scalp® Topical Suspension.
Nonclinical Toxicology
Carcinogenesis, Mutagenesis, Impairment of Fertility
When calcipotriene was applied topically for up to 24 months at dosages of 3, 10 and 30 mcg/kg/day (corresponding to 9, 30 and 90 mcg/m2/day), no biologically significant changes in tumor incidence were observed when compared to control. In a study in which albino hairless mice were exposed to both ultra-violet radiation (UVR) and topically applied calcipotriene, a reduction in the time required for UVR to induce the formation of skin tumors was observed (statistically significant in males only), suggesting that calcipotriene may enhance the effect of UVR to induce skin tumors.
Long-term animal studies have not been performed to evaluate the carcinogenic potential of betamethasone dipropionate.
Calcipotriene did not elicit any genotoxic effects in the Ames mutagenicity assay, the mouse lymphoma TK locus assay, the human lymphocyte chromosome aberration test, or the mouse micronucleus test.
Betamethasone dipropionate did not elicit any genotoxic effect in the Ames mutagenicity assay, the mouse lymphoma TK locus assay, or in the rat micronucleus test.
Studies in rats at doses of up to 54 mcg/kg/day (324 mcg/m2/day) of calcipotriene indicated no impairment of fertility or general reproductive performance.
Studies in male rats at oral doses of up to 200 mcg/kg/day (1,200 mcg/m2/day), and in female rats at oral doses of up to 1,000 mcg/kg/day (6,000 mcg/m2/day) of betamethasone dipropionate indicated no impairment of fertility.
Use In Specific Populations
Pregnancy
Teratogenic Effects: Pregnancy Category C
Animal reproduction studies have not been conducted with Taclonex Scalp® Topical Suspension. Taclonex Scalp® Topical Suspension contains calcipotriene that has been shown to be fetotoxic and betamethasone dipropionate that has been shown to be teratogenic in animals when given systemically. There are no adequate and well- controlled studies in pregnant women. Taclonex Scalp® Topical Suspension should be used during pregnancy only if the potential benefit to the patient justifies the potential risk to the fetus.
Teratogenicity studies with calcipotriene were performed by the oral route in rats and rabbits. In rabbits, increased maternal and fetal toxicity were noted at a dosage of 12 mcg/kg/day (144 mcg/m2/day); a dosage of 36 mcg/kg/day (432 mcg/m2/day) resulted in a significant increase in the incidence of incomplete ossification of the pubic bones and forelimb phalanges of fetuses. In a rat study, a dosage of 54 mcg/kg/day (324 mcg/m2/day) resulted in a significantly increased incidence of skeletal abnormalities (enlarged fontanelles and extra ribs). The enlarged fontanelles were most likely due to the effect of calcipotriene upon calcium metabolism. The estimated maternal and fetal no- adverse effect levels (NOAEL) in the rat (108 mcg/m2/day) and rabbit (48 mcg/m2/day) derived from oral studies are lower than the maximum topical dose of calcipotriene in man (460 mcg/m2/day).
Corticosteroids are generally teratogenic in laboratory animals when administered systemically at relatively low dosage levels. Betamethasone dipropionate has been shown to be teratogenic in mice and rabbits when given by the subcutaneous route at doses of 156 mcg/kg (468 mcg/m2/day) and 2.5 mcg/kg (30 mcg/m2/day), respectively. Those dose levels are lower than the maximum topical dose in man (about 5,950 mcg/m2/day). The abnormalities observed included umbilical hernia, exencephaly and cleft palate.
Pregnant women were excluded from the clinical studies conducted with Taclonex Scalp® Topical Suspension.
Nursing Mothers
Systemically administered corticosteroids appear in human milk and could suppress growth, interfere with endogenous corticosteroid production, or cause other untoward effects.
It is not known whether topically administered calcipotriene or corticosteroids could result in sufficient systemic absorption to produce detectable quantities in human milk.
Because many drugs are excreted in human milk, caution should be exercised when Taclonex Scalp® Topical Suspension is administered to a nursing woman.
Pediatric Use
Safety and effectiveness of the use of Taclonex Scalp® Topical Suspension
in pediatric patients have not been studied. Because of a higher ratio of skin
surface area to body mass, children under the age of 12 years may be at particular
risk of systemic adverse effects when they are treated with topical corticosteroids.
[See WARNINGS AND PRECAUTIONS]
HPA axis suppression, Cushing's syndrome, linear growth retardation, delayed weight gain, and intracranial hypertension have been reported in children receiving topical corticosteroids. Manifestations of adrenal suppression in children include low plasma cortisol levels and absence of response to ACTH stimulation. Manifestations of intracranial hypertension include bulging fontanelles, headaches, and bilateral papilledema.
Geriatric Use
Of the total number of patients in the controlled clinical studies of Taclonex Scalp® Topical Suspension, 334 were 65 years or older, while 84 were 75 years or older.
No overall differences in safety or effectiveness of Taclonex Scalp® Topical Suspension were observed between these patients and younger patients. All other reported clinical experience has not identified any differences in response between elderly and younger patients.
Last updated on RxList: 6/18/2008