CA2344050A1 - Antibiotic compositions for treatment of the eye, ear and nose - Google Patents

Abstract

Ophthalmic, otic and nasal compositions containing a new class of antibiotics (e.g., moxifloxacin) are disclosed. The compositions preferably also contain one or more anti-inflammatory agents. The compositions may be utilized to treat ophthalmic, otic and nasal conditions by topically applying the compositions to the affected tissues.

Description

ANTIBIOTIC COMPOSITIONS FOR
TREATMENT OF THE EYE, EAR AND NOSE
Background of the Invention io The present invention is directed to the provision of topical antibiotic pharmaceutical compositions for the treatment of ophthalmic, otic and nasal infections, particularly bacterial infections, and to methods of treating ophthalmic, otic and nasal infections by applying those compositions to the affected tissues. The compositions and i s methods of the invention are based on the use of a new class of antibiotics. The compositions of the present invention may also contain one or more anti-inflammatory agents.
The use of quinolone antibiotics to treat infections represents the current state of 2o the art in the field of ophthalmic pharmaceutical compositions and methods of treatment.
For example, a topical ophthalmic composition containing the quinolone ciprofloxacin is marketed by Alcon Laboratories, Inc. under the name CILOXANTM lC.'lnr~finxa~in 0.3%) Ophthalmic Solution. The following quinolones have also been utilized in ophthalmic antibiotic compositions:
uinolone Product Manufacturer Ofloxacin OCUFLOXTM Allergan Norfloxacin CHIBROXINTM Merck Lomefloxacin LOMEFLOXTM Senju The foregoing quinolone antibiotic compositions are generally effective in treating ophthalmic infections, and have distinct advantages over prior ophthalmic antibiotic compositions, particularly those having relatively limited spectrums of antimicrobial s activity, such as: neomycin, polvmvxin B. ~entam;~;n a"~t tmhro,~.,....;.., ...L.:..t. ..-_ primarily useful against gram negative pathogens; and bacitracin, gramicidin, and erythromycin, which are primarily active against gram positive pathogens.
However, despite the general efficacy of the ophthalmic quinolone therapies currently available, there is a need for improved compositions and methods of treatment based on the use of jo antibiotics that are more effective than existing antibiotics against key ophthalmic pathogens, and less prone to the development of resistance by those pathogens.
There is an even greater need for effective topical compositions and methods for treating otic and nasal infections, particularly bacterial infections. The use of oral ~s antibiotics to treat otic infections in children has limited efficacy, and creates a serious risk of pathogen resistance to the orally administered antibiotics.
Ophthalmic, otic and nasal infections are frequently accompanied by inflammation of the infected ophthalmic, otic and nasal tissues and perhaps even surrounding tissues.
2o Similarly, ophthalmic, otic and nasal surgical procedures that create a risk of microbial infections frequently also cause inflammation of the affected tissues. Thus, there is also a need for ophthalmic, otic and nasal pharmaceutical compositions that combine the anti-infective activity of one or more antibiotics with the anti-inflammatory activity of one or more steroid or non-steroid agents in a single composition.
2s Summary of the Invention The invention is based on the use of a potent new class of antibiotics to treat ophthalmic, otic and nasal infections, as well as the prophylactic use of these antibiotics 3o following surgery or other trauma to ophthalmic, otic or nasal tissues. The compositions of the present invention may also be administered to the affected tissues during ophthalmic, otic or nasal surgery procedures to prevent or alleviate post-surgical infections.
s The compositions preferably also contain one or more anti-inflammatory agents to treat inflammation associated with infections of ophthalmic, otic or nasal tissues. The anti-inflammatory component of the compositions is also useful in treating inflammation associated with physical trauma to ophthalmic, otic or nasal tissues, including inflammation resulting from surgical procedures. The comn~sitinnc ~f rhP
.,..o~o.,f io invention are therefore particularly useful in treating inflammation associated with trauma to ophthalmic, otic or nasal tissues wherein there is either an infection or a risk of an infection resulting from the trauma.
Examples of ophthalmic conditions that may be treated with the compositions of ~s the present invention include conjunctivitis, keratitis, blepharitis, dacyrocystitis, hordeolum and corneal ulcers. The compositions of the invention may also be used prophylactically in connection with various ophthalmic surgical procedures that create a risk of infection.
2o Examples of otic conditions that may be treated with the compostions of the present invention include otitis externa and otitis media. With respect to the treatment of otitis media, the compositions of the present invention are primarily useful in cases where the tympanic membrane has ruptured or tympanostomy tubes have been implanted.
The compositions may also be used to treat infections associated with otic surgical procedures, 2s such as tympanostomy, or to prevent such infections.
The compositions of the present invention are specially formulated for topical application to ophthalmic, otic and nasal tissues. The compositions are preferably sterile, and have physical properties (e.g., osmolality and pH) that are specially suited for application to ophthalmic, otic and nasal tissues, including tissues that have been compromised Detailed Description of the Invention s The antibiotics used in the compositions and methods of the present invention have the following formula:
(I) COOR
'~ J

I
to R1 wherein ~s R1 is a cyclopropyl which may be substituted by 1 to 3 of substituents selected from the group consisting of a C,-C6 alkyl and a halogen atom, a phenyl which may be substituted by 1 to 3 of substituents selected from the group consisting of C~-C6 alkoxy, a halogen atom and hydroxy, a C,-Cb alkyl which may be substituted by a halogen atom, a C2-C6 alkanoyloxy or hydroxy, a CZ-C6 alkenyl or 2o thienyl;
R2 is a member selected from the group consisting of a 1-piperazinyl group which may have 1 to 3 substituents selected from the group consisting of a C,-C6 alkyl group, a C,-C6 alkanoyl group, a phenyl (C,-C6) alkyl group, and a 2-oxo-1,3-zs dioxolenemethyl group which may be substituted by a phenyl group or a C,-C6 alkyl group; a 1-pyrrolidinyl group which may have 1 to 3 substituents selected from the group consisting of an amino group which can have 1 or 2 substituents selected from a C,-C6 alkyl group and a (C,-C6)alkooxy-carbonyl group, an amino(C,-C6)alkyl group which may have 1 to 2 substituents selected from C~-C6 alkyl group and a (C,-C6)alkoxy-carbonyl group on the amino moiety, and a C,-s alkyl group; a morphoIino group which may have 1 to 3 substituents of C~-C6 alkyl groups; a 1-piperidinyl group which may have 1 to 3 substituents selected from the group consisting of a C,-C6 alkyl group, hydroxy, a halogen atom and oxo group;
and a 1,4-diazobicyclo[4.3.0]nonan-4-yl group;
io R3 is a C,-C6 alkyl;
R is hydrogen atom or a C,-C6 alkyl; and X is a halogen atom, or a pharmaceutically acceptable salt thereof.
is The compound Grepafloxacin is most preferred. Grepafloxacin has the following structure:

2o F ~ COOH
'~ J
N N
NJ
2s Further details regarding the structure, preparation, and physical properties of Grepafloxacin and other compounds of formula (I} are provided in U. S. Patent No.

5,563,138.

The concentrations of the antibiotics of formula (I) in the compositions of the present invention will vary depending on the intended use of the compositions (e.g., treatment of existing infections or prevention of post-surgical infections), and the relative antimicrobial activity of the specific antibiotic selected. The antimirrnh;ai artiv,itm "f s antibiotics is generally expressed as the minimum concentration required to inhibit the growth of a specified pathogen. This concentration is also referred to as the "minimum inhibitory concentration" or "MIC". The term "MIC90" refers to the minimum concentration of antibiotic required to inhibit the growth of ninety percent (90%) of the strains of a species. The concentration of an antibiotic required to totally kill a specified io bacteria is referred to as the "minimum bactericidal concentration" or "MBC". The minimum inhibitory concentration of Grepafloxacin for several bacteria commonly associated with ophthalmic, otic and nasal infections are provided in the following table:
Microor anism MIC 90 is S. aureus/methicillin sensitive 0.13 S. aureus/methicillin resistant 0.13 S. aureus/quinolone resistant 0.13 S. epidermidis/methicillin sensitive 0.13 S. epidermidis/methicillin resistant 0.13 2o S. pneumoniae/penicillin sensitive 0.25 S. pneumoniae/penicillin resistant 0.25 P. aeruginosa g,0 H. influenzae/(3-lactamase positive 0.008 H influenzae/(3lactamase negative 0.008 2s All of the foregoing concentrations are expressed as micrograms per milliliter ("mcg/ml") The appropriate antibiotic concentration for ophthalmic compositions will generally be an amount of one or more antibiotics of formula (I) sufficient to provide a so concentration in the aqueous humor and lacrimal fluid of the eye equal to or greater than the MIC90 level for the selected antibiotic(s), relative to gram-negative and gram-positive organisms commonly associated with ophthalmic infections. The appropriate concentration for otic and nasal compositions will generally be an amount of one or more antibiotics of formula (I) sufficient to provide a concentration in the infected tissues equal s to or greater than the MIC90 level for the selected antibiotic(s), relative to gram-negative and gram-positive organisms commonly associated with otic or nasal infections.
Such amounts are referred to herein as "an antimicrobial effective amount". The compositions of the present invention will typically contain one or more compounds of formula (I) in a concentration of from about 0.1 to about 1.0 percent by weight ("wt. %") of the ~ o compositions.
The compositions of the present invention may also contain one or more anti inflammatory agents. The anti-inflammatory agents utilized in the present invention are broadly classified as steroidal or non-steroidal. The preferred steroidal anti-inflammatory i s agents are glucocorticoids.
The preferred glucocorticoids for ophthalmic and otic use include dexamethasone, loteprednol, rimexolone, prednisolone, fluorometholone, and hydrocortisone.
The preferred glucocorticoids for nasal use include mometasone, fluticasone, beclomethasone, 2o flunisolide, triamcinolone and budesonide.

The dexamethasone derivatives described in U.S. Patent No. 5,223,493 (Boltralik) are also preferred steroidal anti-inflammatory agents, particularly with respect to compositions for treating ophthalmic inflammation. The following compounds are especially preferred:

O
O
O O
O ""O r AL-2512 ~~~~~ii F
These compounds are referred to herein as "21-ether derivatives of dexamethasone". The 21-benzyl ether derivative (i.e., compound AL-2512) is particularly preferred.
Zo The preferred non-steroidal anti-inflammatory agents are: prostaglandin H
synthetase inhibitors (Cox I or Cox II), also referred to as cyclooxygenase type I and type II inhibitors, such as diclofenac, flurbiprofen, ketorolac, suprofen, nepafenac, amfenac, indomethacin, naproxen, ibuprofen, bromfenac, ketoprofen, meclofenamate, piroxicam, sulindac, mefanamic acid, diflusinal, oxaprozin, tolmetin, fenoprofen, benoxaprofen, ~ s nabumetome, etodolac, phenylbutazone, aspirin, oxyphenbutazone, NCX-4016, _g_ HCT-1026, NCX-284, NCX-456, tenoxicam and carprofen; cyclooxygenase type II
selective inhibitors, such as NS-398, vioxx, celecoxib, P54, etodolac, L-804600 and S-33516; PAF antagonists, such as SR-27417, A-137491, ABT-299, apafant, bepafant, minopafant, E-6123, BN-50727, nupafant and modipafant; PDE IV inhibitors, such as s ariflo, torbafylline, rolipram, flaminast, piclamilast, cipamfylline, CG-1088, V-11294A, CT-2820, PD-168787, CP-293121, DWP-205297, CP-220629, SH-636, BAY-19-8004, and roflumilast; inhibitors of cytokine production, such as inhibitors of the NFkB
transcription factor; or other anti-inflammatory agents known to those skilled in the art.
The concentrations of the anti-inflammatory agents contained in the compositions of the present invention will vary based on the agent or agents selected and the type of inflammation being treated. The concentrations will be sufficient to reduce inflammation in the targeted ophthalmic, otic or nasal tissues following topical application of the compositions to those tissues. Such an amount is referred to herein as "an anti-cs inflammatory effective amount". The compositions of the present invention will typically containe one or more anti-inflammatory agents in an amount of from about 0.01 to about 1.0 wt.%.
The compositions are typically administered to the affected ophthalmic, otic or 2o nasal tissues by topically applying one to four drops of a sterile solution or suspension, or a comparable amount of an ointment, gel or other solid or semisolid composition, one to four times per day. However, the compositions may also be formulated as irrigating solutions that are applied to the affected ophthalmic, otic or nasal tissues during surgical procedures.
The ophthalmic, otic and nasal compositions of the present invention will contain one or more compounds of formula (I) and preferably one or more anti-inflammatory agents, in pharmaceutically acceptable vehicles. The compositions will typically have a pH in the range of 4.5 to 8Ø The ophthalmic compositions must also be formulated to 3o have osmotic values that are compatible with the aqueous humor of the eye and ophthalmic tissues. Such osmotic values will generally be in the range of from about 200 to about 400 milliosmoles per kilogram of water ("mOsm/kg"), but will preferably be about 300 mOsm/kg.
s Ophthalmic, otic and nasal products are typically packaged in multidose form.
Preservatives are thus required to prevent microbial contamination during use.
Suitable preservatives include: polyquaternium-l, benzalkonium chloride, thimerosal, chlorobutanol, methyl paraben, propyl paraben, phenylethyl alcohol, edetate disodium, sorbic acid, or other agents known to those skilled in the art. The use of polyquaternium-to 1 as the antimicrobial preservative is preferred. Typically such preservatives are employed at a level of from 0.001 % to 1.0% by weight.
The solubility of the components of the present compositions may be enhanced by a surfactant or other appropriate co-solvent in the composition. Such co-solvents include polysorbate 20, 60, and 80, polyoxyethylene/polyoxypropylene surfactants (e.g., Pluronic is F-68, F-84 and P-103), cyclodextrin, or other agents known to those skilled in the art.
Typically such co-solvents are employed at a level of from 0.01 % to 2% by weight.
The use of viscosity enhancing agents to provide the compositions of the invention with viscosities greater than the viscosity of simple aqueous solutions may be desirable to 2o increase absorption of the active compounds by the target tissues or increase the retention time in the eye, ear or nose. Such viscosity building agents include, for example, polyvinyl alcohol, polyvinyl pyrrolidone, methyl cellulose, hydroxy propyl methylcellulose, hydroxyethyl cellulose, carboxymethyl cellulose, hydroxy propyl cellulose or other agents know to those skilled in the art. Such agents are typically zs employed at a level of from 0.01 % to 2% by weight.
The following examples are provided to further illustrate the ophthalmic, otic and nasal compositions of the present invention.

Exa Oohthalmic/Otic/Nasal Solution Ingredient Amount (wt. %) s Grepafloxacin 0.3 5 Sodium Acetate 0.03 Acetic Acid 0.04 Mannitol 4.60 EDTA 0.05 to BenzaIkonium Chloride 0.006 Water q.s. 100 Example Z
is Ophthalmic/Otic/Nasal Suspension Ingredient Amount (wt. %) Grepafloxacin 0.3 Dexamethasone, Micronized USP 0.10 2o Benzalkonium Chloride 0.01 Edetate Disodium, USP 0.01 Sodium Chloride, USP 0.3 Sodium Sulfate, USP 1.2 Tyloxapol, USP 0.05 2s Hydroxyethylcellulose 0.25 Sulfuric Acid and/or Sodium Hydroxide, NF q.s. for pH adjustment to 5.5 Purified Water, USP q.s. to 100 Examine 3 Ouhthalmic Ointment InEredient Amount (wt.%) Grepafloxacin 0.35 Mineral Oil, USP 2.0 White petrolatium, USP q.s 100 Example 4 Ophthalmic Ointment Ingredient Amount (wt.%) Grepafloxacin 0.3 Is Fluorometholone Acetate, USP 0.1 Chlorobutanol, Anhydrous, NF 0.5 Mineral OiI,USP
White Petrolatum, USP q. s. 100 The invention has been described herein by reference to certain preferred embodiments. However, as obvious variations thereon will become apparent to those skilled in the art, the invention is not to be considered as limited thereto.

Claims (10)

What is claimed is:

1. A topical ophthalmic, otic or nasal pharmaceutical composition comprising an antimicrobial effective amount of one or more compounds of the formula:
wherein R1 is a cyclopropyl which may be substituted by 1 to 3 of substituents selected from the group consisting of a C1-C6 alkyl and a halogen atom; a phenyl which may be substituted by 1 to 3 of substituents selected from the group consisting of C1-C6 alkoxy, a halogen atom and hydroxy; a C1-C6 alkyl which may be substituted by a halogen atom, a C2-C6 alkanoyloxy or hydroxy; a C2-C6 alkenyl;
or thienyl;
R2 is a member selected from the group consisting of a 1-piperazinyl group which may have 1 to 3 substituents selected from the group consisting of a C1-C6 alkyl group, a C1-C6 alkanoyl group, a phenyl (C1-C6) alkyl group, and a 2-oxo-1,3-dioxolenemethyl group which may be substituted by a phenyl group or a C1-C6 alkyl group; a 1-pyrrolidinyl group which may have 1 to 3 substituents selected from the group consisting of an amino group which can have 1 or 2 substituents selected from a C1-C6 alkyl group and a (C1-C6)alkooxy-carbonyl group, an amino(C1-C6)alkyl group which may have 1 to 2 substituents selected from C1-C6 alkyl group and a (C1-C6)alkoxy-carbonyl group on the amino moiety, and a C1-alkyl group; a morpholino group which may have 1 to 3 substituents C1-C6 alkyl groups; a 1-piperidinyl group which may have 1 to 3 substituents selected from the group consisting of a C1-C6 alkyl group, hydroxy, a halogen atom and oxo group;
and a 1,4-diazobicyclo[4.3.0]nonan-4-yl group;
R3 is a C1-C6 alkyl;
R is hydrogen atom or a C1-C6 alkyl; and X is a halogen atom, or a pharmaceutically acceptable salt thereof; and a pharmaceutically acceptable vehicle therefor.

2. A topical composition according to Claim 1, wherein the composition further comprises an anti-inflammatory effective amount of a steroidal or non-steroidal anti-inflammatory agent.

3. A topical composition according to Claim 2, wherein the anti-inflammatory agent comprises a glucocorticoid.

4. A topical composition according to Claim 3, wherein the glucocorticoid is selected from the group consisting of dexamethasone, rimexolone, prednisolone, fluorometholone, hydrocortisone, mometasone, fluticasone, beclomethasone, flunisolide, triamcinolone and budesonide.

5. A topical composition according to Claim 2, wherein the anti-inflammatory agent comprises a non-steroidal agent selected from the group consisting of prostaglandin H
synthetase inhibitors, PAF antagonists, and PDE IV inhibitors.

6. A topical composition according to Claim 1, wherein the compound of formula (I) comprises grepafloxacin.

7. A topical composition according to Claim 6, wherein the composition further comprises an anti-inflammatory effective amount of a steroidal or non-steroidal anti-inflammatory agent.

8. A method of treating or preventing ophthalmic, otic or nasal infections, which comprises topically applying a therapeutically effective amount of the composition of Claim 1 to the affected ophthalmic, otic or nasal tissue.

9. A method of treating or preventing ophthalmic, otic or nasal infections and attendant inflammation, which comprises topically applying a therapeutically effective amount of the composition of Claim 2 to the affected ophthalmic, otic or nasal tissue.

10. A method of treating or preventing ophthalmic, otic or nasal infections and attendant inflammation, which comprises topically applying a therapeutically effective amount of the composition of Claim 7 to the affected ophthalmic, otic or nasal tissue.