DESCRIPTION:
Mometasone furoate monohydrate is an anti-inflammatory corticosteroid having
the chemical name,
9,21-Dichloro-11beta,17-dihydroxy-16alpha-methylpregna-1,4-diene-3,20-dione
17-(2-furoate) monohydrate.
Mometasone furoate monohydrate is a white powder, with an empirical formula
of C27H30CI2O8·H2O, and
a molecular weight of 539.45. It is practically insoluble in water; slightly
soluble in methanol, ethanol, and isopropanol; soluble in acetone and
chloroform; and freely soluble in tetrahydrofuran. Its partition coefficient
between octanol and water is greater than 5000.
Nasonex nasal spray, 50 mug is a
metered-dose, manual pump spray unit containing an aqueous suspension of
mometasone furoate monohydrate equivalent to 0.05% w/w mometasone furoate
calculated on the anhydrous basis; in an aqueous medium containing glycerin,
microcrystalline cellulose and carboxymethylcellulose sodium, sodium citrate,
0.25% w/w phenylethyl alcohol, citric acid, benzalkonium chloride, and
polysorbate 80. The pH is between 4.3 and 4.9.
After initial priming (10 actuations), each actuation of the pump delivers a
metered spray containing 100 mg of suspension containing mometasone furoate
monohydrate equivalent to 50 mug of mometasone furoate calculated on the
anhydrous basis. Each bottle of Nasonex nasal
spray, 50 mug provides 120 sprays.
Mometasone furoate is a corticosteroid demonstrating anti-inflammatory
properties. The precise mechanism of corticosteroid action on allergic rhinitis
is not known. Corticosteroids have been shown to have a wide range of effects on
multiple cell types (e.g., mast cells, eosinophils, neutrophils,
macrophages, and lymphocytes) and mediators (e.g., histamine, eicosanoids,
leukotrienes, and cytokines) involved in inflammation.
Mometasone furoate demonstrated no mineralocorticoid, androgenic,
antiandrogenic, or estrogenic activity in preclinical studies. After
administration of a single intranasal dose of mometasone furoate to adult male
rats, the highest drug levels were seen in the esophagus, trachea, nasal
passage, and mouth.
In two clinical studies utilizing nasal antigen challenge, mometasone furoate
decreased some markers of the early- and late-phase allergic response. These
observations included decreases (vs. placebo) in histamine and eosinophil
cationic protein levels, and reductions (vs. baseline) in eosinophils,
neutrophils, and epithelial cell adhesion proteins. The clinical significance of
these findings is not known.
The effect of mometasone furoate on nasal mucosa following 12 months of
treatment was examined in 46 patients with allergic rhinitis. There was no
evidence of atrophy and there was a marked reduction in intraepithelial
eosinophilia and inflammatory cell infiltration (e.g., eosinophils,
lymphocytes, monocytes, neutrophils, and plasma cells).
The effects of renal impairment, hepatic impairment, age, or gender on
mometasone furoate pharmacokinetics have not been adequately investigated.
Three clinical pharmacology studies have been conducted in humans to assess
the effect of mometasone furoate at various doses on adrenal function. In one
study, daily doses of 200 and 400 mug of mometasone furoate and 10 mg of
prednisone were compared to placebo in 64 patients with allergic rhinitis.
Adrenal function before and after 36 consecutive days of treatment was assessed
by measuring plasma cortisol levels following a 6-hour Cortrosyn (ACTH) infusion
and by measuring 24-hour urinary-free cortisol levels. Mometasone furoate, at
both the 200 and 400 mug dose, was not associated with a statistically
significant decrease in mean plasma cortisol levels post-Cortrosyn infusion or a
statistically significant decrease in the 24-hour urinary-free cortisol levels
compared to placebo. A statistically significant decrease in the mean plasma
cortisol levels post-Cortrosyn infusion and 24-hour urinary-free cortisol levels
was detected in the prednisone treatment group compared to placebo.
A second study assessed adrenal response to mometasone furoate (400 and 1600
mug/day), prednisone (10 mg/day), and placebo, administered for 29 days in 48
male volunteers. The 24-hour plasma cortisol area under the curve (AUC0-24),
during and after an 8-hour Cortrosyn infusion and 24-hour urinary-free cortisol
levels were determined at baseline and after 29 days of treatment. No
statistically significant differences of adrenal function were observed with
mometasone furoate compared to placebo.
A third study evaluated single, rising doses of mometasone furoate (1000,
2000, and 4000 mug/day), orally administered mometasone furoate (2000, 4000, and
8000 mug/day), orally administered dexamethasone (200, 400, and 800 mug/day),
and placebo (administered at the end of each series of doses) in 24 male
volunteers. Dose administrations were separated by at least 72 hours.
Determination of serial plasma cortisol levels at 8 AM and for the 24-hour
period following each treatment were used to calculate the plasma cortisol area
under the curve (AUC0-24). In addition, 24-hour urinary-free cortisol
levels were collected prior to initial treatment administration and during the
period immediately following each dose. No statistically significant decreases
in the plasma cortisol AUC, 8 AM cortisol levels, or 24-hour urinary-free
cortisol levels were observed in volunteers treated with either mometasone
furoate or oral mometasone, as compared with placebo treatment. Conversely,
nearly all volunteers treated with the 3 doses of dexamethasone demonstrated
abnormal 8 AM cortisol levels (defined as a cortisol level <10 mug/dl),
reduced 24-hour plasma AUC values, and decreased 24-hour urinary-free cortisol
levels, as compared to placebo treatment.
The efficacy and safety of mometasone furoate in the prophylaxis and
treatment of seasonal allergic rhinitis and the treatment of perennial allergic
rhinitis have been evaluated in 18 controlled trials, and one uncontrolled
clinical trial, in approximately 3000 adults (age 17-85) and adolescents (age
12-16). This included 1757 males and 1453 females, including a total of 283
adolescents (182 boys and 101 girls) with seasonal allergic or perennial
allergic rhinitis, treated with mometasone furoate at doses ranging from 50 to
800 mug/day. The majority of patients were treated with 200 mug/day. These
trials evaluated the total nasal symptom scores that included stuffiness,
rhinorrhea, itching, and sneezing. Patients treated with mometasone furoate 200
mug/day had a significant decrease in total nasal symptom scores compared to
placebo-treated patients. No additional benefit was observed for mometasone
furoate doses greater than 200 mug/day. A total of 350 patients have been
treated with mometasone furoate for 1 year or longer.
In patients with seasonal allergic rhinitis, mometasone furoate demonstrated
improvement in nasal symptoms (vs. placebo) within 2 days after the first dose.
Maximum benefit is usually achieved within 1 to 2 weeks after initiation of
dosing.
Prophylaxis of seasonal allergic rhinitis for patients 12 years of age and
older with mometasone furoate, given at a dose of 200 mug/day, was evaluated in
two clinical studies in 284 patients. These studies were designed such that
patients received 4 weeks of prophylaxis with mometasone furoate prior to the
anticipated onset of the pollen season, however, some patients received only 2
to 3 weeks of prophylaxis. Patients receiving 2 to 4 weeks of prophylaxis with
mometasone furoate demonstrated a statistically significantly smaller mean
increase in total nasal symptom scores with onset of the pollen season as
compared to placebo patients.
Mometasone furoate is indicated for the prophylaxis and treatment of the
nasal symptoms of seasonal allergic rhinitis and the treatment of the nasal
symptoms of perennial allergic rhinitis, in adults and children 12 years of age
and older. In patients with a known seasonal allergen that precipitates nasal
symptoms of seasonal allergic rhinitis, initiation of prophylaxis with
mometasone furoate is recommended 2 to 4 weeks prior to the anticipated start of
the pollen season.
Hypersensitivity to any of the ingredients of this preparation
contraindicates its use.
The replacement of a systemic corticosteroid with a topical corticosteroid
can be accompanied by signs of adrenal insufficiency and, in addition, some
patients may experience symptoms of withdrawal (i.e., joint and/or
muscular pain, lassitude, and depression). Careful attention must be given when
patients previously treated for prolonged periods with systemic corticosteroids
are transferred to topical corticosteroids, with careful monitoring for acute
adrenal insufficiency in response to stress. This is particularly important in
those patients who have associated asthma or other clinical conditions where too
rapid a decrease in systemic corticosteroid dosing may cause a severe
exacerbation of their symptoms.
If recommended doses of intranasal corticosteroids are exceeded or if
individuals are particularly sensitive or predisposed by virtue of recent
systemic steroid therapy, symptoms of hypercorticism may occur, including very
rare cases of menstrual irregularities, acneiform lesions, and cushingoid
features. If such changes occur, topical corticosteroids should be discontinued
slowly, consistent with accepted procedures for discontinuing oral steroid
therapy.
Persons who are on drugs which suppress the immune system are more
susceptible to infections than healthy individuals. Chickenpox and measles, for
example, can have a more serious or even fatal course in nonimmune children or
adults on corticosteroids. In such children or adults who have not had these
diseases, particular care should be taken to avoid exposure. How the dose,
route, and duration of corticosteroid administration affects the risk of
developing a disseminated infection is not known. The contribution of the
underlying disease and/or prior corticosteroid treatment to the risk is also not
known. If exposed to chickenpox, prophylaxis with varicella zoster immune globin
(VZIG) may be indicated. If exposed to measles, prophylaxis with pooled
intramuscular immunoglobulin (IG) may be indicated. (See the respective package
inserts for complete VZIG
and IG
prescribing information.) If chickenpox develops, treatment with antiviral
agents may be considered.
PRECAUTIONS:
General
In clinical studies with mometasone furoate, the development of localized
infections of the nose and pharynx with Candida albicans has occurred
only rarely. When such an infection develops, use of mometasone furoate should
be discontinued and appropriate local or systemic therapy instituted, if needed.
Nasal corticosteroids should be used with caution, if at all, in patients
with active or quiescent tuberculous infection of the respiratory tract, or in
untreated fungal, bacterial, systemic viral infections, or ocular herpes
simplex.
Rarely, immediate hypersensitivity reactions may occur after the intranasal
administration of mometasone furoate monohydrate. Extreme rare instances of
wheezing have been reported.
Rare instances of nasal septum perforation and increased intraocular pressure
have also been reported following the intranasal application of aerosolized
corticosteroids. As with any long-term topical treatment of the nasal cavity,
patients using mometasone furoate over several months or longer should be
examined periodically for possible changes in the nasal mucosa.
Because of the inhibitory effect of corticosteroids on wound healing,
patients who have experienced recent nasal septum ulcers, nasal surgery, or
nasal trauma should not use a nasal corticosteroid until healing has occurred.
Glaucoma and cataract formation was evaluated in one controlled study of 12
weeks' duration and one uncontrolled study of 12 months' duration in patients
treated with mometasone furoate at 200 mug/day, using intraocular pressure
measurements and slit lamp examination. No significant change from baseline was
noted in the mean intraocular pressure measurements for the 141 mometasone
furoate-treated patients in the 12-week study, as compared with 141
placebo-treated patients. No individual mometasone furoate-treated patient was
noted to have developed a significant elevation in intraocular pressure or
cataracts in this 12-week study. Likewise, no significant change from baseline
was noted in the mean intraocular pressure measurements for the 139 mometasone
furoate-treated patients in the 12-month study and again, no cataracts were
detected in these patients. Nonetheless, nasal and inhaled corticosteroids have
been associated with the development of glaucoma and/or cataracts. Therefore,
close follow-up is warranted in patients with a change in vision and with a
history of glaucoma and/or cataracts.
When nasal corticosteroids are used at excessive doses, systemic
corticosteroid effects such as hypercorticism and adrenal suppression may
appear. If such changes occur, mometasone furoate should be discontinued slowly,
consistent with accepted procedures for discontinuing oral steroid therapy.
Information for the Patient
Patients being treated with mometasone furoate should be given the following
information and instructions. This information is intended to aid in the safe
and effective use of this medication. It is not a disclosure of all intended or
possible adverse effects. Patients should use mometasone furoate at regular
intervals (once daily) since its effectiveness depends on regular use.
Improvement in nasal symptoms of allergic rhinitis has been shown to occur
within 2 days after the first dose. Maximum benefit is usually achieved within 1
to 2 weeks after initiation of dosing. Patients should take the medication as
directed and should not increase the prescribed dosage by using it more than
once a day in an attempt to increase its effectiveness. Patients should contact
their physician if symptoms do not improve, or if the condition worsens. To
assure proper use of this nasal spray, and to attain maximum benefit, patients
should read and follow the accompanying Patient's Instructions for Use
carefully.
Patients should be cautioned not to spray mometasone furoate into the eyes.
Persons who are on immunosuppressant doses of corticosteroids should be
warned to avoid exposure to chickenpox or measles, and patients should also be
advised that if they are exposed, medical advice should be sought without delay.
Carcinogenesis, Mutagenesis, and Impairment of Fertility
In Sprague Dawley rats, mometasone furoate demonstrated no statistically
significant increase in the incidence of tumors at an inhalation dose of 67
mug/kg (approximately 3 times the maximum recommended daily intranasal dose in
adults on a mug/m2 basis). In Swiss CD-1 mice, mometasone furoate
demonstrated no statistically significant increase in the incidence of tumors at
an inhalation dose of 160 mug/day (approximately 4 times the maximum recommended
daily intranasal dose in adults on a mug/m2 basis).
At cytotoxic doses, mometasone furoate produced an increase in chromosome
aberrations in vitro in Chinese hamster ovary-cell cultures in the
nonactivation phase, but not in the presence of rat liver S9 fraction.
Mometasone furoate was not mutagenic in the mouse-lymphoma assay and the Salmonella
/E.coli /mammalian microsome mutation assay, a Chinese hamster lung cell
(CHL) chromosomal-aberrations assay, an in vivo mouse bone-marrow
erythrocyte-micronucleus assay, a rat bone-marrow clastogenicity assay, and the
mouse male germ-cell clastogenicity assay. Mometasone furoate also did not
induce unscheduled DNA synthesis in vivo in rat hepatocytes.
In reproductive toxicity studies in rats, mometasone furoate administered
subcutaneously caused prolonged gestation, prolonged and difficult labor,
reduced offspring survival, and reduced maternal body weight gain following
treatment at 15 mug/kg (approximately ¾ the maximum recommended daily
intranasal dose in adults on a mug/m2 basis). Impairment of fertility
in rats was not produced by subcutaneous doses up to 15 mug/kg.
Pregnancy Category C
Teratogenic Effects: Mometasone furoate caused cleft palate in mice at
subcutaneous doses of 60 and 180 mug/kg, (approximately 2 and 4 times the
maximum recommended daily intranasal dose in adults on a mug/m2
basis, respectively). Offspring survival was reduced in the 180 mug/kg group.
The nonteratogenic subcutaneous dose level in mice was 20 mug/kg (approximately
½ the maximum recommended daily intranasal dose in adults on a mug/m2
basis).
In rabbits, mometasone furoate was teratogenic and caused flexed front paws
at a topical dermal dose of 150 mug/kg (approximately 14 times the maximum
recommended daily intranasal dose in adults on a mug/m2 basis).
In rats, mometasone furoate produced umbilical hernia, cleft palate, and
delayed ossification at a topical dermal dose of 600 mug/kg (approximately 30
times the maximum recommended daily intranasal dose in adults on a mug/m2
basis). At 1200 mug/kg (approximately 60 times the maximum recommended daily
intranasal dose in adults on a mug/m2 basis), microphthalmia,
umbilical hernias, and delayed ossification were observed in rat pups.
In these teratogenicity studies, there were also reductions in maternal body
weight gain and effects on fetal growth (lower fetal body weights and/or delayed
ossification) in mice (60 and 180 mug/kg), rabbits (150 mug/kg), and rats (600
mug/kg).
In an oral teratology study in rabbits, at 700 mug/kg, (approximately 70
times the maximum recommended daily intranasal dose in adults on a mug/m2
basis), increased incidences of resorptions and malformations, including cleft
palate and/or head malformations (hydrocephaly or domed head) were observed.
Pregnancy failure was observed in most rabbits at 2800 mug/kg (approximately 270
times the maximum recommended daily intranasal dose in adults on a mug/m2
basis).
There are no adequate, and well-controlled studies in pregnant women.
Mometasone furoate, like other corticosteroids, should be used during pregnancy
only if the potential benefits justify the potential risk to the fetus.
Experience with oral corticosteroids since their introduction in pharmacologic,
as opposed to physiologic doses suggests that rodents are more prone to
teratogenic effects from corticosteroids than humans. In addition, because there
is a natural increase in corticosteroid production during pregnancy, most women
will require a lower exogenous corticosteroid dose and many will not need
corticosteroid treatment during pregnancy.
Nonteratogenic Effects: Hypoadrenalism may occur in infants born to
women receiving corticosteroids during pregnancy. Such infants should be
carefully monitored.
Nursing Mothers
It is not known if mometasone furoate is excreted in human milk. Because
other corticosteroids are excreted in human milk, caution should be used when
mometasone furoate is administered to nursing women.
Pediatric Use
Safety and effectiveness in children less than 12 years of age have not been
established.
Geriatric Use
A total of 203 patients above 64 years of age (age range 64-85) have been
treated with mometasone furoate for up to 3 months. The adverse reactions
reported in this population were similar in type and incidence to those reported
by younger patients.