CA2346227A1

CA2346227A1 - Composition and method for treating allergic diseases

Info

Publication number: CA2346227A1
Application number: CA002346227A
Authority: CA
Inventors: Robert G. Aslanian; John J. Piwinski
Original assignee: Individual
Current assignee: Merck Sharp and Dohme LLC
Priority date: 1998-10-09
Filing date: 1999-10-06
Publication date: 2000-04-20
Also published as: WO2000021512A2; AR020740A1; PE20001097A1; EP1117405A2; CO5140078A1; AU6252699A; MY130725A; WO2000021512A3; JP2002527381A; CN1329490A

Abstract

The present invention is directed towards a pharmaceutical composition useful for the treatment of allergic rhinitis, asthma and related disorders. In one embodiment, the compositions comprises, in combination, a therapeutically effective amount of at least one neurokinin antagonist, a therapeutically effective amount of at least one H3 antagonist and a therapeutically effective amount of at least one H1 antagonist.

Description

~OMPOSITiON AND METHOD FOR TREATING ALLERGIC
DISEASES
FIELD OF THE INVENTION
The present invention generally relates to compositions and methods for treating allergic rhinitis and other respiratory diseases. It specifically discloses compositions which comprise combinations of antagonists of neurokinin receptors and antagonists of histamine receptors, and methods for treating the above-noted diseases with such compositions.
BACKGROUND OF THE INVENTION
Neurokinin receptors such as the NK, and the NK2 receptors are found in the central nervous system, the circulatory system, and the peripheral tissues of mammals, and are involved in a variety of biological processes. Antagonists of the neurokinin receptors are, therefore, expected to be useful in the treatment or prevention of various mammalian diseases such as, for example, pulmonary disorders such as asthma, cough, bronchospasm, chronic obstructive pulmonary diseases, and airway hyperactivity; skin disorders and itch, for example, atopic dermatitis, and cutaneous wheat and flare; neurogenic inflammatory diseases such as, arthritis, migraine, nociception; CNS diseases such as anxiety, emesis, Parkinson's disease, movement disorders and psychosis; convulsive disorders, renal disorders, urinary incontinence, ocular inflammation"
inflammatory pain, and eating disorders such as food intake inhibition;
allergic rhinitis, neurodegenerative disorders, psoriasis, Huntington's disease, depression and various disorders such as Crohn's disease. NK, receptors have been reported to be involved in microvascular leakage and mucus secretion, and NK2 receptors have been associated with smooth muscle contraction, making NK, and NK2 receptor antagonists especially useful in the treatment and prevention of asthma. NK, and NK2 receptor antagonists have been reported such as, for example, in U.S. patents 5,798,359; 5,795,894; 5,789,422; 5,783,579; 5,719,156; 5,696,267;
5,691,362; 5,688,960; 5,654,316; and in "Recent Advances in Neurokinin Receptor Antagonists", by C. J. Ohnmacht Jr., et al, Annual Reports in Medicinal Chemistry, A. M. Doherty Ed., 33, 71-80 (1998).

SUBSTITUTE SHEET (RULE 26) and related disorders is well known. A discussion is provided by, for example, R. Aslanian et al, Exp.Opin.Ther.Patents, 7~~., 201-207 (1997) as well as in references cited therein.
The discovery of the H3 receptor is a fairly recent phenomenon. The H3 receptor is most abundantly distributed in the CNS, and in lesser amounts in peripheral tissues. The H3 receptor is considered an important general neuroregulatory mechanism for various physiological processes, not only in the CNS but in peripheral tissues as well. A discussion of the H3 receptor and antagonists therefor can be found in J. G. Phillips et al, Annual Reports in Medicinal Chemistry, J. Bristol, ed., ~, 31-40 (1998).
Compounds that antagonize both the NK, and H, receptors are disclosed, for example, in WO 96-06094 (Marion Merrell Dow, 1996). Dual antagonists of the H, and H3 receptors are discussed, for example, in pending U.S. patent application, Serial No. 08/909,319, filed August 14, 1997. Pending U.S. patent application, Serial No. 60/068,638, filed December 23, 1997, discloses compositions comprising leukotriene antagonists and H, receptors.
It would be highly desirable to enhance the efficacy of the neurokinin antagonists to improve their overall efficacy.
SUMMARY OF THE INVENTION
The afore-mentioned objective and other objectives and desires are addressed by the present invention which, in one embodiment, provides a composition for treating and preventing allergic rhinitis and other respiratory diseases such asthma, cough, wheezing and the like. The inventive composition comprises: (i) a therapeutically effective amount of at least one neurokinin antagonist; (ii) a therapeutically effective amount of at least one H3 antagonist and (iii) a therapeutically effective amount of at feast one H, antagonist. One or more of the antagonists may be substituted by a pharmaceutically acceptable derivative such as salt, ester, and the like, if so desired. Optionally, the composition may additionally contain a pharmaceutically acceptable carrier, a decongestant (such as, for example, pseudoephedrine), a cough suppressant (such as, for example, dexrtomethorphan), expectorant (such as, for example, guaifenesin), SUBSTITUTE SHEET (RULE 26) analgesics (such as, for example, aspirin, ibuprofen and acetaminophen) or mixtures thereof.
Generally, the amount of the neurokinin antagonist content in the inventive composition is about 1-1,000 milligrams, preferably about 10-500 milligrams, and typically about 50-200 milligrams. The amount of the H3 antagonist is generally about 1-1,000 milligrams, preferably about 1-500 milligrams, and typically about 1-50 milligrams. The amount of the H, antagonist is generally about 1-200 milligrams, preferably about 1-100 milligrams, and typically about 2-10 milligrams.
The invention further provides a method for treating asthma and allergic disorders, sneezing, itching runny nose, nasal congestion, redness of the eye, tearing, itching of the ears or palate, sinusitis, and coughs associated with postnasal drip symptoms in a mammalian organism in need of such treatment comprising administering a pharmaceutical composition as described above.
DETAILED DESrRIPTION OF THE INVENTION
In one embodiment, the present invention discloses pharmaceutical compositions that are useful in treating and preventing allergic rhinitis, asthma and related disorders. The composition comprises, in combination, a therapeutically effective amount of at least one neurokinin antagonist, a therapeutically effective amount of at least one H3 antagonist and a therapeutically effective amount of at least one H, antagonist. One or more of the antagonists may be substituted by a pharmaceutically acceptable derivative such as salt (such as, for example, hydrochloride), ester, and the like.
Several neurokinin antagonists that are currently known are useful in the practice of the present invention. Non-limiting examples of such useful neurokinin antagonists include, for example, those belonging to the chemical class of oximes, hydrazones, piperidines, piperazines, aryl alkyl amines, hydrazones, nitroalkanes, amides, isoxazolines, quinolines, isoquinofines, azanorbornanes, naphthyridines, benzodiazepines and the like. Many are disclosed in the U.S. patents cited earlier in this patent application. Preferred NK antagonists are those disclosed in the above-noted U.S. patents 5,798,359; 5,795,894; 5,789,422; 5,783,579; 5,719,156;

SUBSTITUTE SHEET (RULE 26) 5,696,267; 5,691,362; 5,688,960; 5,654,316. The general formula of some of so-disclosed compounds is:
A
Z X T
a Q
wherein Z is B Y' m \ ' or N N
N
where B is OR2; NRsCOR2, CONR6R, or NR2CONRER,, m=Oorl, P is R5 aryl; or RS heteroaryl; and Y is H, CR2R3C02R6; CR2R3CONR6R, or CR2R3NR6COR2;
a= b= 0, 1 or 2;
Q has the same definitions as P above, with the proviso that P and Q may be the same or different;
A is =N-OR,; =N-NR2R3; or =CR, R2;
X is -O-; -NRs ; -N(R6)CO-; or -CO-NRs ;
T is R4 aryl; R4-heteroaryl; R~-cycloalkyl; or R2-bridged cycloalkyi;
R, is H, C,-Cs alkyl; or (CHZ)~-G where n=1-6, G iS H; R4 aryl; R4-heteroaryl; CORE; C02R6; CONR6R,; CN; OCOR6; S03R2;
C(=NORZ)NRsR,; C(=NR2)NR6R,, with the proviso that when nil, G can additionally be OR6, NR fiR, or NR6(CO)R,;
R2 and R3 are independently H or C,-C6 alkyl;
R4 and R5 are independently 1, 2 or 3 substituents independently selected from OR2, OC(O)R2, OC(O)NR6R,, C,-Cs alkyl, H, halogen, CF3, CZF5, or OCF3;
and Rs and R, are independently selected from H or C,-C6 alkyl, with the proviso that when R6 and R, are part of NRsR, then said NR6R, may form part of a C5 C6 ring wherein 0-2 ring members are selected from the group consisting of -O-, -S- and -NR2 , with the further proviso that said CS C6 ring may contain substituents on said ring with said substituents being selected from the group consisting of hydrogen, halogen, -ORs and -COOR6.

SUBSTITUTE SHEET (RULE 26) WO 00/21512 PCT/US99/21437 .
Particularly preferred neurokinin antagonists are those disclosed in the above-mentioned U.S. patents and belonging to the general formula:

('O
N
R ~ N
O N CI
C
O
CI
and stereoisomers thereof. More particularly preferred are the stereolsomers with the general formula:

O
N
N
R, N
O N \ CI
CI
where R is H, CH2CONH2, CH2CONHMe, CHZCONMe2 or H O N OH

The currently known H3 receptor antagonists cannot be easily classified chemically. Illustrative H3 receptor antagonists useful in the practice of the present invention include, without limitation, thioperamide (technical name: N-cyclohexyl-4-(1H-imidazol-4-yl)-1-SUBSTITUTE SHEET (RULE 26) piperidinecarbothioamide, CAS Registry Number: 106243-16-7), impromidine (technical name: N-[3-(1 H-imidazol-4-yl)propyl]-N'-[2-[[(5-methyl-1 H-imidazol-4-yl)methyl]thio]ethyl]guanidine, CAS Registry Number:
65573-02-6), burimamide (technical name: N-[4-(1 H-imidazol-4-yl}butyl]-N'-methylthiourea, CAS Registry Number: 55720-27-9), clobenpropit (technical name: [(4-chlorophenyl)methyl]-3-(1 H-imidazol-4-yl)propyl ester of carbamimidothioic acid, CAS Registry Number: 145231-45-4), impentamine, mifetidine, S-sopromidine (technical name: N-(2-(1 H-imidazol-4-yl}-1-methylethyl]-N'-[2-[[(5-methyl-1 H-imidazol-4-yl}methyl]thio]ethylguanidine, CAS Registry Number: 99616-14-5), R-sopromidine (CAS Registry Number:
79313-75-0), SKF-91486 (technical name: [3-(1 H-imidazol-4-yl)propylguanidine, CAS Registry Number: 46129-28-6), GR-175737 (CAS
Registry Number: 203874-78-6), GT-2016 (CAS Registry Number: 152241-24-2), GT-2331, UCL-1199 (technical name: 2-[[2-(1 H-imidazol-4-yl)ethyl]thio]-5-nitropyridine, CAS Registry Number: 152030-16-5), 1 H-imidazole-4-pentanamine (CAS Registry Number: 34973-91-6), clozapine (technical name: 8-chloro-11-(4-methyl-1-piperazinyl)-5H-dibenzo[b,e][1,4]diazepine, CAS Registry Number: 54241-01-9) and the compound N-(3,5-dichlorophenyl)-N'-[[4-[(1 H-imidazol-4-yl)methyl]phenyl]methyl]urea, and whose structure is shown below:
H N
N
HN~ I
N
O
CI
Certain benzamidines and benzylamidines as H3 antagonists have been described by R. Aslanian ef al, Bioorganic & Medicinal Chemistry, $, 2263-2268 (1998). Other compounds can readily be evaluated to determine activity at H3 receptors by known methods, including, for example, the guinea pig brain membrane assay and the guinea pig neuronal ileum contraction assay, both of which are described in U.S. patent 5,352,707.
Another useful assay utilizes rat brain membranes and is described by West et al, "Identification of Two H3-Histamine Receptor Subtypes", Molecular Pharmacology, ~, 610-613 (1990).

SUBSTITUTE SHEET (RULE 26) WO 00/21512 PCTNS99/2143?
Numerous chemical substances are known to have histamine H, receptor antagonist activity. Many such compounds can be classified broadly as ethanolamines, ethylenediamines, alkylamines, phenothiazines, piperidines, and the like. Illustrative H, receptor antagonists useful in the practice of the present invention include, without limitation, astemizole, ceterizine, azatadine, azelastine, acrivastine, brompheniramine, chlorpheniramine, clemastine, cyclizine, carebastine, cyproheptadine, carbinoxamine, descarboethoxyloratadine (also known as desloratadine or "DCL" ), doxylamine, dimethindene, ebastine, epinastine, efletirizine,.
fexofenadine, hydroxyzine, ketotifen, loratadine, levocabastine, meclizine, mizolastine, mequitazine, mianserin, noberastine, norastemizole, normethylastemizole, picumast, pyrilamine, promethazine, terfenadine, tripelennamine, temelastine, trimeprazine, and tripolidine. Other compounds can readily be evaluated to determine activity at H, receptors by known methods including, for example, specific blockade of the contractile response to histamine of isolated guinea pig ileum.
In a further embodiment, this invention discloses a method for treatment of asthma, allergic rhinitis, and other allergic disorders, sneezing, itching runny nose, nasal congestion, redness of the eye, tearing, itching of the ears or palate, wheezing, sinusitis, and coughs associated with postnasal drip symptoms in a mammalian organism in need of such treatment comprising administering a pharmaceutical composition which comprises the neurokinin antagonist, H3 antagonist and the H, antagonist as described above.
In the pharmaceutical compositions and methods of the present invention, the active ingredients will typically be administered in admixture with suitable pharmaceutical diluents, excipients or carriers (collectively referred to herein as carrier materials) suitably selected with respect to the intended form of administration, i.e. oral tablets, capsules (either solid-filled, semi-solid filled or liquid filled), powders for constitution, oral gels, elixirs, dispersible granules, syrups, suspensions, and the like, and consistent with conventional pharmaceutical practices. For example, for oral administration in the form of tablets or capsules, the active drug component may be combined with any oral non-toxic pharmaceutically acceptable inert carrier, such as lactose, starch, sucrose, cellulose, magnesium stearate, dicalcium phosphate, calcium sulfate, talc, mannitol, ethyl alcohol (liquid forms) and _7_ SUBSTITUTE SHEET (RULE 26) WO 00/21512 PCT/US99/21437 .
the like. Moreover, when desired or needed, suitable binders, lubricants, disintegrating agents and coloring agents may also be incorporated in the mixture. Powders and tablets may be comprised of from about 5 to about 95 percent inventive composition. Suitable binders include starch, gelatin, natural sugars, com sweeteners, natural and synthetic gums such as acacia, sodium alginate, carboxymethylcellulose, polyethylene glycol and waxes.
Among the lubricants there may be mentioned for use in these dosage forms, boric acid, sodium benzoate, sodium acetate, sodium chloride, and the like. Disintegrants include starch, methylcellulose, guar gum and the like.
Sweetening and flavoring agents and preservatives may also be included where appropriate. Some of the terms noted above, namely disintegrants, diluents, lubricants, binders and the like, are discussed in more detail below.
Additionally, the compositions of the present invention may be formulated in sustained release form to provide the rate controlled release of any one or more of the components or active ingredients to optimize the therapeutic effects, i.e. neurokinin antagonism, antihistaminic activity and the like. Suitable dosage forms for sustained release include layered tablets containing layers of varying disintegration rates or controlled release polymeric matrices impregnated with the active components and shaped in tablet form or capsules containing such impregnated or encapsulated porous polymeric matrices.
Liquid form preparations include solutions, suspensions and emulsions. As an example may be mentioned water or water-propylene glycol solutions for parenteral injections or addition of sweeteners and opacifiers for oral solutions, suspensions and emulsions. Liquid form preparations may also include solutions for intranasal administration.
Aerosol preparations suitable for inhalation may include solutions and solids in powder form, which may be in combination with a pharmaceutically acceptable carrier such as inert compressed gas, e.g.
nitrogen.
For preparing suppositories, a low melting wax such as a mixture of fatty acid glycerides such as cocoa butter is first melted, and the active ingredient is dispersed homogeneously therein by stirring or similar mixing.
_g_ SUBSTITUTE SHEET (RULE 26) The molten homogeneous mixture is then poured into convenient sized molds, allowed to cool and thereby solidify.
Also included solid form preparations which are intended to be converted, shortly before use, to liquid form preparations for either oral or parenteral administration. Such liquid forms include solutions, suspensions and emulsions.
The compounds of the invention may also be deliverable , transdermally. The transdermal compositions may take the form of creams, lotions, aerosols and/or emulsions and can be included in a transdermal patch of the matrix or reservoir type as a re conventional in the art for this purpose.
Preferably the compound is administered orally.
Preferably, the pharmaceutical preparation is in a unit dosage form. In such form, the preparation is subdivided into suitably sized unit doses containing appropriate quantities of the active components, e.g., an effective amount to achieve the desired purpose.
The quantity of the inventive active composition in a unit dose of preparation may be generally varied or adjusted from about 0.01 milligrams to about 1,000 milligrams, preferably from about 0.01 to about 750 milligrams, more preferably from about 0.01 to about 500 milligrams, and typically from about 0.01 to about 250 milligrams, according to the particular application. The actual dosage employed may be varied depending upon the patient's age, sex, weight and severity of the condition being treated.
Such techniques are well known to those skilled in the art. Generally, the human oral dosage form containing the active ingredients can be administered 1 or 2 times per day. The amount and frequency of the administration will be regulated according to the judgment of the attending clinician. A generally recommended daily dosage regimen for oral administration may range from about 0.04 milligrams to about 4,000 milligrams per day, in single or divided doses.
Capsule - refers to a special container or enclosure made of methyl cellulose, polyvinyl alcohols, or denatured gelatins or starch for holding or _g_ SUBSTITUTE SHEET (RULE 26) containing compositions comprising the active ingredients. Hard shell capsules are typically made of blends of relatively high gel strength bone and pork skin gelatins. The capsule itself may contain small amounts of dyes, opaquing agents, plasticizers and preservatives.
Tablet- refers to a compressed or molded solid dosage form containing the active ingredients with suitable diluents. The tablet can be prepared by compression of mixtures or granulations obtained by wet granulation, dry granulation or by compaction. .
Oral gels-refers to the active ingredients dispersed or solubilized in a hydrophillic semi-solid matrix.
Powders for constitution refers to powder blends containing the active ingredients and suitable diluents which can be suspended in water or juices.
Difuent - refers to substances that usually make up the major portion of the composition or dosage form. Suitable diluents include sugars such as lactose, sucrose, mannitol and sorbitol; starches derived from wheat, corn rice and potato; and celluloses such as microcrystalline cellulose. The amount of diluent in the composition can range from about 10 to about 90%
by weight of the total composition, preferably from about 25 to about 75%, more preferably from about 30 to about 60% by weight, even more preferably from about 12 to about 60%.
Disintegrants - refers to materials added to the composition to help it break apart (disintegrate) and release the medicaments. Suitable disintegrants include starches; ucold water soluble" modified starches such as sodium carboxymethyl starch; natural and synthetic gums such as locust bean, karaya, guar, tragacanth and agar; cellulose derivatives such as methylcellulose and sodium carboxymethylcellulose; microcrystalline celfuloses and cross-linked microcrystalline celluloses such as sodium croscarmellose; alginates such as alginic acid and sodium alginate; clays such as bentonites; and effervescent mixtures. The amount of disintegrant in the composition can range from about 2 to about 15% by weight of the composition, more preferably from about 4 to about 10% by weight.

SUBSTITUTE SHEET (RULE 26) Binders - refers to substances that bind or "glue" powders together and make them cohesive by forming granules, thus serving as the "adhesive" in the formulation. Binders add cohesive strength already available in the difuent or bulking agent. Suitable binders include sugars such as sucrose; starches derived from wheat, com rice and potato; natural gums such as acacia, gelatin and tragacanth; derivatives of seaweed such as alginic acid, sodium alginate and ammonium calcium alginate; cellulosic materials such as methylcellulose and sodium carboxymethylcellulose and hydroxypropylmethylcellulose; polyvinylpyrrolidone; and inorganics such as magnesium aluminum silicate. The amount of binder in the composition can range from about 2 to about 20% by weight of the composition, more preferably from about 3 to about 10% by weight, even more preferably from about 3 to about 6% by weight.
Lubricant - refers to a substance added to the dosage form to enable the tablet, granules, etc. after it has been compressed, to release from the mold or die by reducing friction or wear. Suitable lubricants include metallic stearates such as magnesium stearate, calcium stearate or potassium stearate; stearic acid; high melting point waxes; and water soluble lubricants such as sodium chloride, sodium benzoate, sodium acetate, sodium oleate, polyethylene glycols and d'I-leucine. Lubricants are usually added at the very last step before compression, since they must be present on the surfaces of the granules and in between them and the parts of the tablet press. The amount of lubricant in the composition can range from about 0.2 to about 5% by weight of the composition, preferably from about 0.5 to about 2%, more preferably from about 0.3 to about 1.5% by weight.
Glidents - materials that prevent caking and improve the flow characteristics of granulations, so that flow is smooth and uniform. Suitable glidents include silicon dioxide and talc. The amount of glident in the composition can range from about 0.1 % to about 5% by weight of the total composition, preferably from about 0.5 to about 2% by weight.
Coloring agents - excipients that provide coloration to the composition or the dosage form. Such excipients can include food grade dyes and food grade dyes adsorbed onto a suitable adsorbent such as clay or aluminum oxide. The amount of the coloring agent can vary from about 0.1 to about 5%
by weight of the composition, preferably from about 0.1 to about 1%.

SUBSTITUTE SHEET (RULE 26) Bioavailability - refers to the rate and extent to which the active drug ingredient or therapeutic moiety is absorbed into the systemic circulation from an administered dosage form as compared to a standard or control.
Conventional methods for preparing tablets are known. Such methods include dry methods such as direct compression and compression of granulation produced by compaction, or wet methods or other special procedures. Conventional methods for making other forms for administration such as, for example, capsules, suppositories and the like are also well known.
It will be apparent to those skilled in the art that many modifications, variations and alterations to the present disclosure, both to materials and methods, may be practiced. Such modifications, variations and alterations are intended to be within the spirit and scope of the present invention.

SUBSTITUTE SHEET (RULE 26)

Claims

What is claimed is:

1. A pharmaceutical composition comprising, in combination, a therapeutically effective amount of at least one neurokinin antagonist or a pharmaceutically acceptable derivative thereof; a therapeutically effective amount of at least one H3 antagonist or a pharmaceutically acceptable derivative thereof; and a therapeutically effective amount of at least one H, antagonist or a pharmaceutically acceptable derivative thereof.

2. The pharmaceutical composition of claim 1, wherein said neurokinin antagonist or its pharmaceutically acceptable derivative is present in amounts of 1-1,000 milligrams per unit dosage of said pharmaceutical composition.

3. The pharmaceutical composition of claim 1, wherein said neurokinin antagonist or its pharmaceutically acceptable derivative is present in amounts of 10-500 milligrams per unit dosage of said pharmaceutical composition.

4. The pharmaceutical composition of claim 1, wherein said neurokinin antagonist or its pharmaceutically acceptable derivative is present in amounts of 50-200 milligrams per unit dosage of said pharmaceutical composition.

5. The pharmaceutical composition of claim 1, wherein said H3 antagonist or its pharmaceutically acceptable derivative is present in amounts of 1-1,000 milligrams per unit dosage of said pharmaceutical composition.

6. The pharmaceutical composition of claim 1, wherein said H3 antagonist or its pharmaceutically acceptable derivative is present in amounts of 1-500 milligrams per unit dosage of said pharmaceutical composition.

7. The pharmaceutical composition of claim 1, wherein said H3 antagonist or its pharmaceutically acceptable derivative is present in amounts of 1-50 milligrams per unit dosage of said pharmaceutical composition.

8. The pharmaceutical composition of claim 1, wherein said H1 antagonist or its pharmaceutically acceptable derivative is present in amounts of 1-200 milligrams per unit dosage of said pharmaceutical composition.

9. The pharmaceutical composition of claim 1, wherein said H1 antagonist or its pharmaceutically acceptable derivative is present in amounts of 1-100 milligrams per unit dosage of said pharmaceutical composition.

10. The pharmaceutical composition of claim 1, wherein said H1 antagonist or its pharmaceutically acceptable derivative is present in amounts of 2-10 milligrams per unit dosage of said pharmaceutical composition.

11. The pharmaceutical composition of claim 1, wherein said neurokinin antagonist is a compound having the general formula:

where B is OR2; NR6COR2, CONR6R, or NR2CONR6R7, m=0 or 1, P is R5 aryl; or R5 heteroaryl; and Y is H, CR2R3CO2R6; CR2R3CONR6R7 or CR2R3NR6COR2;
a= b= 0, 1 or 2;
Q has the same definitions as P above, with the proviso that P and Q may be the same or different;
A is =N-OR,; =N-NR2R3; or =CR1R2;
X is -O-; -NR6; -N(R6)CO-; or -CO-NR6-;

T is R,-aryl; R4 heteroaryl; R4-cycloalkyl; or R2 bridged cycloalkyl;
R, is H, C1-C6 alkyl; or (CH2)n-G where n=1-6, G is H; R4 aryl; R4 heteroaryl; COR6; CO2R6; CONR6R,; CN; OCOR6; SO3R2;
C(=NOR2)NR6R,; C(=NR2)NR6R7, with the proviso that when n~1, G can additionally be OR6, NR6R7 or NR6(CO)R7;
R2 and R3 are independently H or C1-C6 alkyl;
R4 and R5 are independently 1, 2 or 3 substituents independently selected from OR2, OC(O)R2, OC(O)NR6R7, C1-C6 alkyl, H, halogen, CF3, C2F5, or OCF3;
and R6 and R7 are independently selected from H or C1-C6 alkyl, with the proviso that when R6 and R7 are part of NR6R7 then said NR6R7 may form part of a C5-C6 ring wherein 0-2 ring members are selected from the group consisting of -O-, -S- and -NR2-, with the further proviso that said C5-C6 ring may contain substituents on said ring with said substituents being selected from the group consisting of hydrogen, halogen, -OR6 and -COOR6.

12. The pharmaceutical composition of claim 1, wherein said neurokinin antagonist is a compound having the general formula:

and stereoisomers thereof, wherein R=H; CH2CONH2 ; CH2CONHMe;
CH2CONMe2 or

13. The pharmaceutical composition of claim 1, wherein said neurokinin antagonist is a compound having the general formula:

where R is H; CH2CONH2; CH2CONHMe; or

14. The pharmaceutical composition of claim 13, wherein said neurokinin antagonist has R=CH2CONH2.

15. The pharmaceutical composition of claim 1, wherein said H3 antagonist is selected from the group consisting of impromidine, burimamide, clobenpropit, impentamine, mifetidine, thioperamide, S-sopromidine, R-sopromidine, SKF-91486, GR-175737, GT-2016, GT-2331, UCL-1199, 1H-imidazole-4-pentanamine, clozapine and N-(3,5-dichlorophenyl)-N'-[[4-[(1H-imidazol-4-yl)methyl]phenyl]methyl]urea.

16. The pharmaceutical composition of claim 15, wherein said H3 antagonist is N-(3,5-Dichlorophenyl)-N'-[[4-[(1H-imidazol-4-yl)methyl]phenyl]methyl]urea.

17. The pharmaceutical composition of claim 15, wherein said H3 antagonist is GT-2331.

18. The pharmaceutical composition of claim 1, wherein said H, antagonist is an ethanolamine, ethylenediamine, alkylamine, phenothiazine or piperidine.

19. The pharmaceutical composition of claim 1, wherein said H, antagonist is selected from the group consisting of ceterizine, astemizole, azatadine, azelastine, acrivastine, brompheniramine, chlorpheniramine, clemastine, cyclizine, carebastine, cyproheptadine, carbinoxamine, descarboethoxyloratadine, doxylamine, dimethindene, ebastine, epinastine, efletirizine, fexofenadine, hydroxyzine, ketotifen, loratadine, levocabastine, meclizine, mizolastine, mequitazine, mianserin, noberastine, norastemizole, picumast, pyrilamine, promethazine, terfenadine, tripelennamine, temelastine, trimeprazine, and tripolidine.

20. The pharmaceutical composition of claim 19, wherein said H, antagonist is loratadine.

21. The pharmaceutical composition of claim 19, wherein said H, antagonist is descarboethoxyloratadine.

22. The pharmaceutical composition of claim 1, additionally containing one or more materials selected from the group consisting of a pharmaceutically acceptable carrier, a decongestant, a cough suppressant and an expectorant.

23. A method for the treatment of asthma, allergic rhinitis, sneezing, itching runny nose, nasal congestion, redness of the eye, tearing, itching of the ears or palate, wheezing, coughs associated with postnasal drip symptoms and respiratory disorders associated with allergy in a mammalian organism in need of such treatment, said treatment comprising:
administering a pharmaceutical composition comprising, in combination, a therapeutically effective amount of at least one neurokinin antagonist or a pharmaceutically acceptable derivative thereof; a therapeutically effective amount of at least one H3 antagonist or a pharmaceutically acceptable derivative thereof; and a therapeutically effective amount of at least one H, antagonist or a pharmaceutically acceptable derivative thereof.

24. The method of claim 23, wherein said neurokinin antagonist is a compound having the general formula:

wherein Z is where B is OR2; NR6COR2, CONR6R7 or NR2CONR6R7, m=0 or 1, P is R5 aryl; or R5 heteroaryl; and Y is H, CR2R3CO2R6; CR2R3CONR6R7 or CR2R3NR6COR2;
a= b= 0, 1 or 2;
Q has the same definitions as P above, with the proviso that P and Q may be the same or different;
A is =N-OR1; =N-NR2R3; or =CR1R2;
X is -O-; -NR6; -N(R6)CO-; or -CO-NR6-;
T is R4-aryl; R4-heteroaryl; R4-cycloalkyl; or R2-bridged cycloalkyl;
R, is H, C1-C6 alkyl; or (CH2)n-G where n=1-6, G is H; R4-aryl; R4-heteroaryl; COR6; CO2R6; CONR6R7; CN; OCOR6; SO3R2;
C(=NOR2)NR6R7; C(=NR2)NR6R7, with the proviso that when n~1, G can additionally be OR6, NR6R7 or NR6(CO)R7;
R2 and R3 are independently H or C1-C6 alkyl;
R4 and R5 are independently 1, 2 or 3 substituents independently selected from OR2, OC(O)R2, OC(O)NR6R7, C1-C6 alkyl, H, halogen, CF3, C2F5, or OCF3;
and R6 and R7 are independently selected from H or C1-C6 alkyl, with the proviso that when R6 and R7 are part of NR6R7 then said NR6R7 may form part of a C5-C6 ring wherein 0-2 ring members are selected from the group consisting of -O-, -S- and -NR2, with the further proviso that said C5-C6 ring may contain substituents on said ring with said substituents being selected from the group consisting of hydrogen, halogen, -OR6 and -COOR6.

25. The method of claim 23, wherein said neurokinin antagonist is a compound having the general formula:

where R=H; CH2CONH2; CH2CONHMe; CH2CONMe2 or

26. The method of claim 23, wherein said neurokinin antagonist is a compound having the general formula:

where R is H; CH2CONH2; CH2CONHMe; CH2CONMe2; or

27. The method of claim 26, wherein said neurokinin antagonist is the compound with R= CH2CONHMe.

28. The method of claim 23, wherein said H3 antagonist is selected from the group consisting of thioperamide, impromidine, burimamide, clobenpropit, impentamine, mifetidine, S-sopromidine, R-sopromidine, SKF-91486, GR-175737, GT-2016, , GT-2331, UCL-1199, 1H-imidazole-4-pentanamine, clozapine, and N-(3,5-dichlorophenyl)-N'-[[4-[(1H-imidazol-4-yl)methyl]phenyl]methyl]urea.

29. The method of claim 28, wherein said H3 antagonist is N-(3,5-dichlorophenyl)-N'-[[4-[(1H-imidazol-4-yl)methyl]phenyl]methyl]urea.

30. The method of claim 23, wherein said H, antagonist is selected from the group consisting of ceterizine, astemizole, azatadine, azelastine, acrivastine, brompheniramine, chlorpheniramine, clemastine, cyclizine, carebastine, cyproheptadine, carbinoxamine, descarboethoxyloratadine, doxylamine, dimethindene, ebastine, epinastine, efletirizine, fexofenadine, hydroxyzine, ketotifen, loratadine, levocabastine, meclizine, mizolastine, mequitazine, mianserin, noberastine, norastemizole, picumast, pyrilamine, promethazine, terfenadine, tripelennamine, temelastine, trimeprazine, and tripolidine.

31. The method of claim 30, wherein said H, antagonist is ioratadine.

32. The method of claim 30, wherein said H, antagonist is descarboethoxyloratadine.