AU727737B2 - Method for treating dysphagia - Google Patents

Description

Our Ref: 7464526 P/00/011 Regulation 3:2

AUSTRALIA

Patents Act 1990

ORIGINAL

COMPLETE SPECIFICATION STANDARD PATENT a Applicant(s): Address for Service: Allergan Sales, Inc 2525 Dupont Drive Irvine California 92612 United States of America DAVIES COLLISON CAVE Patent Trade Mark Attorneys Level 10, 10 Barrack Street SYDNEY NSW 2000 Method for treating dysphagia Invention Title: The following statement is a full description of this invention, including the best method of performing it known to me:- 5020 METHOD FOR TREATING DYSPHAGIA FIELD OF THE INVENTION The present invention provides novel methods for treating various disorders and conditions, with Botulinum toxins. Importantly, the present invention provides methods useful in treating a swallowing disorder (dysphagia). The invention also relates to relieving pain related to muscle activity or contracture and therefore is of advantage in the treatment of, for example, muscle spasm such as Temporomandibular Joint Disease, low back pain, myofascial pain, pain related to spasticity and dystonia, as well as sports injuries, and pain related to contractures in arthritis. The invention also provides compositions suitable for use in the methods.

15 BACKGROUND OF THE INVENTION o* Heretofore, Botulinum toxins, in particular Botulinum toxin type A, has been used in the treatment of a number of neuromuscular disorders and conditions involving muscular spasm; for example, strabismus, blepharospasm, spasmodic torticollis (cervical dystonia), oromandibular dystonia and spasmodic dysphonia (laryngeal dystonia). The toxin binds rapidly and strongly to presynaptic cholinergic nerve terminals and inhibits the exocytosis of acetylcholine by decreasing the frequency of acetylcholine release. This results in local paralysis and hence relaxation of the muscle afflicted by spasm.

For one example of treating neuromuscular disorders, see U.S. Patent No.

5,053,005 to Borodic, which suggests treating curvature of the juvenile P \WPDOCSKDF\SPECS DIV 6 DESCRIPTION.DOC-I I Feb6air 20(X1 spine, scoliosis, with an acetylcholine release inhibitor, preferably Botulinum toxin

A.

For the treatment of strabismus with Botulinum toxin type A, see Elston, et al., British Journal of Ophthalmology, 1985, 69, 718-724 and 891- 896. For the treatment of blepharospasm with Botulinum toxin type A, see Adenis, et al., J. Fr. Ophthalmol., 1990, 13 at pages 259-264.

For treating squint, see Elston, Eye, 1990, 4(4):VII. For treating spasmodic and oromandibular dystonia torticollis, see Jankovic et al., Neurology 1987, 37, 616-623.

*15 Spasmodic dysphonia has been treated with Botulinum toxin type A. See Blitzer et al., Ann.

Otol. Rhino. Laryngol, 1985, 94, 591-594. Lingual dystonia was treated with Botulinum toxin type

A

according to Brin et al., Adv. Neurol. (1987) 50, 599- 608. Finally, Cohen et al., Neurology (1987) 37 (Suppl. 123-4, discloses the treatment of writer's cramp with Botulinum toxin type A.

The term Botulinum toxin is a generic term embracing the family of toxins produced by the anaerobic bacterium Clostridium botulinum and, to date, seven immunologically distinct neurotoxins have been identified. These have been given the designations

A,

B, C, D, E, F and G. For further information concerning the properties of the various Botulinum toxins, reference is made to the article by Jankovic and Brin, The New England Journal of Medicine, No. 17, 1990, pp. 1186-1194, and to the review by Charles

L.

Hatheway in Chapter 1 of the book entitled Botulinum Neurotoxin and Tetanus Toxin, L. L. Simpson, Ed., -3published by Academic Press Inc. of San Diego, California, 1989, the disclosures in hich are incorporated herein by reference.

The neurotoxic component of Botulinum toxin has ht molecular weight of about 150 kilodaltons and is thought to comprise a short polypeptide chain of about kD which is considered to be responsible for the toxic properties of the toxin, i.e by interfring with the exocytosis of acetylcholine, by decreasing the frequency of acetylcholine release and a larger polypeptide chain of about 100 kD which is believed to be necessary to enable the toxin to bind to the presynaptic membrane.

The "short" and "lonnr by means ofr and "log chains are linked together y means of a simple disulfide bridge. (It is noted Sthat certain serotypes of Botulinum toxin, type E, may exist in the form of a single chain un-nicked protein, as opposed to a dichain The single chain S. form is less active but may be converted to the corresponding dichain by nicking with a protease, trypsin. Both the single and the dichain are method of the present invention.) present invention.) In general, four physioogic groups of C. botuinum are recognized II, III, IV). The organtuisms capable of producinc a T h e o r g a nisms capable of roducing a serologically distinct toxin may come from more than one physiological group. For example Type B and F toxins can be produced by strains from Group I or II. In addition, other strains of clostridial species baratii, type F; C. butyricum, type E; C. novyi, type C 1 or D) have been identified which can produce botulinum neurotoxins.

Immunotoxin conjugates of ricin and antibodies, which are characterized as having enhanced cytotoxicity through improving cell surface affinity, are disclosed in European Patent Specification 0 129 434. The inventors note that botulinum toxin may be utilized in place of ricin.

Botulinum toxin is obtained commercially by establishing and growing cultures of C. botulinum in a fermenter and then harvesting and purifying the fermented mixture in accordance with known techniques.

Botulinum toxin type A, the toxin type generally utilized in treating neuromuscular conditions, is currently available commercially from several sources; for example, from Porton Products Ltd. UK, under the trade name "DYSPORT," and from Allergan, Inc., Irvine, California, under the trade name BOTOX@.

o- It is a preferred object of the invention to provide novel treatments of neuromuscular disorders and conditions with various Botulinum toxin types. It is another preferred object of the present invention to relieve pain with various Botulinum toxin types.

SUMMARY OF THE INVENTION According to a first aspect of the present invention there is provided a method for treating a swallowing disorder, the method comprising the step of administering to a patient an effective amount of a botulinum toxin in order to treat a swallowing disorder.

According to a second aspect of the present invention there is provided use of a botulinum toxin in the preparation of a medicament for the treatment of a swallowing disorder.

The present invention provides a method for relieving pain, associated with muscle contractions, a composition and a method of treating conditions such as cholinergic controlled secretions including excessive sweating, lacrimation and mucus secretions and a method for treating smooth muscle disorders including, but not limited \:\WPDOCS\KDENSPECS\DIV 6 DESCRITIONDOC- II Fnary to, spasms in the sphincter of the cardiovascular arteriole, gastrointestinal system, urinary, gall bladder and rectum, which method comprises administering to the patient suffering from said disorder or condition a therapeutically effective amount of Botulinum toxin selected from the group consisting of Botulinum toxin types B, C, D, E, F and G.

Each serotype of Botulinum toxin has been identified as immunologically different proteins through the use of specific antibodies. For example, if the antibody (antitoxin) recognises, that is, neutralises the biological activity of, for example, type A it will not recognise types B, C, D, E, F or G.

While all of the Botulinum toxins appear to be zinc endopeptidases, the mechanism of action of different serotypes, for example, A and E within the neuron appear to be different than that of Type B. In addition, the neuronal surface "receptor" 15 for the toxin appears to be different for the serotypes.

In the area of use of the Botulinum toxins in accordance with the present invention with regard to organ systems which involve the release of neurotransmitter, it is expected to introduce the toxins A, B, C, D, E, F, and G directly by local injections.

Throughout this specification and the claims which follow, unless the context requires otherwise, the word "comprise", and variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of 25 integers or steps.

DETAILED DESCRIPTION The Botulinum toxins used according to the present invention are Botulinum toxins type A, B, C, D, E, F and G.

P \WPDOCSIKDF\SPECS\DIV 6. DESCRIPTIONDOC-j2 Fcbn.ary 2000 -6- The physiologic groups Of Clost-ridium botulinun types are listed in Table

I.

Table 1. Physiologic Groups of Clostridiwn botudinm Toxin GIUCoC Phge Gmup Scjo- Bioc,,bcizy Milk pamypkaJ Type D4=~s Nnca JRclated tatioo L. P a&iI Cubidiuml I AB,'F Proteolyfic Saccharolytjc ooro ens) 11 B.EF nonprol ytjrc Saccharolytic Psychotrophic III C.D flonprOicolytc Saccharolyfic C o IV G PaOteolytic nonsaccharolylic sh-ia These toxin types may be produced by selection from teappropriate physiologic group Of ClOstridium **.bo~tulinum organisms. h organis~s designated as *Group I are usually referredtoa relyian Botulinum toxins of types A, B and F.Th 15h *organisms designated as Group II are saccharolytic and produce Botulinum toxins of types B, E and F. The organisms designated as Group III produce only Botulinum toxin types C and D and are di1stinguished from organisms of Groups I and II by the production of sigifiantamounts of prop-ionic acid. Group

I

organisms only produce neurotoxin of type G. The production of ayand all of the Botulinum toxin types A, B, C, D, E, F and G are described in Chapter 1 of .25 Botuljnum Neurotoxin and Tetanus- Toxin, cited Above, and/or the references cited therein. Botulinum toxins types B, C, D, E, F and G are also available from various species of clostridia.

Currently fourteen species of clostridia are considered pathogenic. Most of the pathogenic strains produce toxins which are responsible for the various Pathological signs and symptoms. Organisms which pro- -7duce Botulinum toxins have been isolated from botulism outbreaks in huans (types A, B, E and F) and animals (types C and Their identities were described through the use of Thei d w e r e described through the use of specific antitoxins (antibodies) developed against the earlier toxins. Type toxin as found in soil nd ha T y p e G t o x i n was found in soil and has low toxigenicity. However, it has been isolated from autopsy specimens, but thus far there has not been adequate evidence that type G botulism has occurred in humans.

Preferably, the toxin is administered by means of intramuscular injection directly into a local area such as a spastic muscle, preferably in the region of 1 5"the neuromuscular junction, although alternative types of administration subcutaneous injection), which can deliver the toxin directly t the affected region, may be employed where appropriate. The toxin oan be presented as a sterile pyrogen-free aqueous solution or dispersion and as a sterile powder for reconstitution into a sterile solution or dispersion.

uWhere desired, tonicity adjusting agents such as odium chloride, glycerol and various sugars can b added. Stabilizers such as human serum albumin may also be included. e s h u m a n s e r u a l b u mi n m ay also be includedi The formulation may be preserved by means of a suitable Pharmaceutically acceptable preervative such as a paraben, although preferably it is unpreserved.

t is preferred that the toxin is formulated in unit dosage form; for example, it can be provided as a sterile solution in a vial or as a vial or sachet containing a lyophilized powder for reconstituting a suitable vehicle such as saline for injection -8- In one embodiment, the Botulinum toxin is formulated in a solution containing saline and pasteurized human serum albumin, which stabilizes the toxin and minimizes loss through non-specific adsorption. The solution is sterile filtered (0.2 micron. filter), filled into individual vials and then vacuumdried to give a sterile lyophilized powder. In use, the powder can be reconstituted by the addition of sterile unpreserved normal saline (sodium chloride 0.9% for injection).

The dose of toxin administered to the patient will depend upon the severity of the condition; e.g., S.:i 5 the number of muscle groups requiring treatment, the he poten of a pand otency of the toxin. The potency of the toxin is expressed as a multiple of the

LD

50 value for the mouse, one unit

(U)

Sof toxin being defined as being the equivalent to that amount, on a per mouse basis, that kills 50% per mouse basis, that kills 50% of a group of Swiss-Webster mice weighing between 17 2 0 and 22 grains each.

The dosages used in human therapeutic applications are roughly proportional to the mass of muscle being injected. Typically, the dose administered to the patient may be up from about 0.01 to abut 1,000 units; for example up to about 500 units, and Preferably in the up to about 500 units, and p i te range from ab-ut-8 t about460 units per patient per treatment although smaller of larger doses may be administered in appropriate circumstances such as up to about 50 units for the relief of pain and in controlling cholinergic secretions.

As the physicians become more familiar with the use of this product the dose may be changed. In the Botulinum toxin type A, available from Porton, -9- DYSPORT, 1 nanogram (ng) contains 40 units. 1 ng of the Botulinum toxin type A, available from Allergn, Inc., BOTOX contains 4 units. The potency of Botulinum toxin and its long duration of action mean that doses will tend to be administered on an infrequent basis. Ultimately, however, both th quantity of toxin administered and the frequency of its administration will be at the discretion of the physician responsible for the treatment and will be commensurate with questions of safety and the effects produced by the toxin.

y n d t h e In some circumstances, particularly in the relief of pain associated with sports injuries, such as, for 15 example, charleyhorse, botulinum type F, having a short duration activity, is preferred.

SThe invention will now be illustrated by 2reference to the following nonlimiting examples.

e*a. In each of the examples, appropriate areas of each patientare injected with a sterile solution containing the confirmation of Botulinum toxin. Total p atient doses range from about 0.01 units to 460 units. Before injecting any muscle group, careful consideration is given to the anatomy of the muscle highest i to inject the area with -conthe knownt entration of neuromuscular junctions, if known. Before injecting the muscle, the position of the neede r in the muscle is confirmed by putting the muscle through its range of motion and observing the resultant motion of the needle end. General anaesthesia, local anaesthesia and sedation are used according to the age of the patient, the number of sites to be injected, and the particular needs of the patient. More than one injection and/or sites of injection may be necessary to achieve the desired result. Also, some injections, depending on the muscle to be injected, may require the use of fine, hollow, tefloncoate needles, guided by electromyography.

Following injection, it is noted that there are no systemic or local side effects and none of the patients are found to develop extensive local hypotonicity. The majority of patients show an improvement in function both subjectively and when measured objectively.

o dyskinesia resulting from the treatment with an antipsychotic drug, such as Thorazine or Haldol, is treated with 150 units of Botulinum toxin type B by direct injection of such toxin into the facial muscles. After 1-3 days, the symptoms of tardive dyskinesia, orofacial dyskinesia, athetosis ystonia chorea, tics and facial grimacing, etc. are markedly reduced.

Example _1(a) The method of Example 1 is repeated, except that a patient suffering from tardive dyskinesia is injected with 50-200 units of Botulinum toxin type c A similar result is obtained.

-11- ExaMRLe 1(b) The method of Example 1 is repeated, except that a patient suffering from tardive dyskinesia is injected with 50-200 units of Botulimum toxin type D. A similar result is obtained.

EXAMU~e 1c) The method of Example 1 is repeated, except that a patient suffering from tardive dyskinesia is injected with 50-200 units of Botulinum toxin type E. A similar result is obtained.

1 K M e

_L

.The method of Example 1 is repeated, except that anpatent suffering from tardive dyskinesia is injetedwith 50-200 units of Botulinum toxin type

F.

A similar result is obtained.

*.EXampleI(e The method of Example 1 is repeated, except that a patient suffering from tardive dyskinesia is injected with 50-200 units of Botulinum toxin type G. A similar result is obtained.

M aI~pe Use of Botulinum j ty eBithTramn A male, age 45, suffering from spasmodic torticollis, as manifested by spasmodic or tonic contractions of- the neck musculature, producing -12stereotyped abnormal deviations of the head, the chin being rotated to one side, and the shoulder being elevated toward the side at which the head is rotated, is treated by injection with 100-1,000 units of Botulinum toxin type E. After 3-7 days, the symptoms are substantially alleviated; the patient is able to hold his head and shoulder in a normal position.

Example 2(a) The method of Example 2 is repeated, except that a patient suffering from spasmodic torticollis is 5 injected with 100-1,000 units of Botulinum toxin type 15 B. A similar result is obtained.

Example 2(b) The method of Example 2 is repeated, except that 20 a patient suffering from spasmodic torticollis is injected with 100-1,000 units of Botulinum toxin type C. A similar result is obtained.

Example 2(c) The method of Example 2 is repeated, except that a patient suffering from spasmodic torticollis is injected with 100-1,000 units of Botulinum toxin type D. A similar result is obtained.

Example 2(d) The method of Example 2 is repeated, except that a patient suffering from spasmodic torticollis is -13injected with 100-1,000 units of Botulinum toxin type E. A similar result is obtained.

Example 2 (el The method of Example 2 is repeated except that a patient suffering from spasmodic torticollis is injected with 100-1,000 units of Botulinum toxin type F. A similar result is obtained.

Example 2 (f) The method of Example 2 is repeated, except that a patient re p e a ted, except that a patient uffering from spasmodic torticollis is injected with 00-1,000 units of Botulinum toxin type G. A similar result is obtained.

*Example 3 The Use of Botulinum toxin in the Treatment of Essential Tremor A male, age 45, suffering from essential tremor, 25 which is manifested as a rhythmical oscillation of head or hand muscles and is provoked by maintenance of posture or movement, is treated by injection with l,000 units of Botulinum toxin type B. After two to eight weeks, the symptoms are substantially alleviated; the patient's head or hand ceases to oscillate.

-14- Example 3 (a) The method of Example 3 is repeated, except that a patient suffering from essential tremor is injected with 00-1,000 units of Botulinum toxin type C. A.

similar result is obtained.

Example 3 (b) The method of Example 3 is repeated, except that a patient suffering from essential tremor is injected with 100-1,000 units of Botulinum toxin type D.

A

similar result is obtained.

15 .15d Example 3c) The method of Example 3 irepeated, except that a patient suffering from essential tremor is injected with 100-1,000 uit enti trmor i, injected with 00-1, 000 units of Botulinum toxin type E. A similar result is obtained.

Example 3(d) The method of Example 3 is repeated, except that a patient suffering from essential tremor is injected with 100-1,000 units of Botulinum toxin type F. A -similar result is obtained.

Example 3 e) The method of Example 3 is repeated, except that a patient suffering from essential tremor is injected with 100-1,000 units of Botulinum toxin type G. A similar result is obtained.

Example 4 The Use of Botulinum toxin in the Treatment of SPasmodic Dvs honia A male, age 45, unable to speak clearly, due to spasm of the vocal chords, is treated by injection of the vocal chords with Botulinum toxin type B, having an activity of 80-500 units. After 3-7 days, the patient is able to speak clearly.

Example 4(a) The method of Example 4 is repeated, except that a patient suffering from spasmodic dysphonia is 15 injected with 80-500 units of Botulinu toxin type A similar result is obtained. n t y p e Example 4(b) 20The method of Exam 0 The method of Example 4 is repeated, except that a patient suffering from spasmodic dysphonia is injected with 80-500 units of Botulinum toxin type

D.

A similar result is obtained.

25 Example 4(c) -The method of Example 4 is repeated ,-except -that a patient suffering from spasmodic dysphonia is injected with 80-500 units of Botulinum toxin type

E.

A similar result is obtained.

Example 4 (d) The method of Example 4 is repeated, except that a patient suffering from spasmodic dysphonia is -16injected with 80-500 units of Botulinum toxin type F.

A similar result is obtained.

Example 4(e) The method of Example 4 is repeated, except that a patient suffering from spasmodic dysphonia is injected with 8-500 units of Botulinum toxin type G.

A similar result is obtained.

Example The Use of Botulinum toxin Types A-G in the Treatment of Excessive Sweating. Lacrimation or Mucus Secretion or Other Cholinergic Controlled 15 Secretions A male, age 65, with excessive unilateral sweating is treated by administering 0.01 to 50 units, of Botulinum toxin, depending upon degree of desired effect. The larger the dose, usually the greater spread and duration of effect. Small doses are used initially. Any serotype toxin alone or in combination .could be used in this indication. The administration is to the gland nerve plexus, ganglion, spinal cord or central nervous system to be determined by the physician's knowledge of the anatomy and physiology of the -target glands and- secretary -ce-lls. In addition, the appropriate spinal cord level or brain area can be injected with the toxin (although this would cause many effects, including general weakness). Thus, the gland (if accessible) or the nerve plexus or ganglion are the targets of choice. Excessive sweating, tearing (lacrimation), mucus secretion or gastrointestinal secretions are positively influenced by the cholinergic nervous system. Sweating and -17tearing are under greater cholinergic control than mucus or gastric secretion and would respond better to toxin treatment. However, mucus and gastric secretions could be modulated through the cholinergic system. All symptoms would be reduced or eliminated with toxin therapy in about 1-7 days. Duration would be weeks to several months.

Example 6 1 0 The Use of Botulinum toxin Types A-G in the Treatment of Muscle Spasms in Smooth Muscle Disorders Such As Sphincters of the Cardiovascular Arteriole, Gastrointestinal System Urinary or Gall :0 Bladder, Rectal, Etc.

.A male, age 30-40, with a constricted pyloric valve which prevents his stomach from emptying, is I treated by administering 1-50 units of Botulinum toxin. The administration is to the pyloric valve 20 (which controls release of stomach contents into the intestine) divided into 2 to 4 quadrants, injections made with any endoscopic device or during surgery. In about 1-7 days, normal emptying of the stomach elimination or drastic reduction in regurgitation occurs.

l- The Use of Botulinum toxin Types A-G in the Treatment of Muscle Spasms and Control of Pain Associated with Muscle Spasms in Temporal Mandibular Joint Disorders A female, age 35, is treated by administration of 0.1 to 50 units total of Botulinum toxin. The administration is to the muscles controlling the -18closure of the jaw. Overactive muscles may be identified with EMG (electromyography) guidance.

Relief of pain associated with muscle spasms, possible reduction in jaw clenching occurs in about 1-3 days.

Example 8 The Use of Botulinum toxin Types A-G in the Treatment of Muscle Spasms and Control of Pain Associated with Muscle Spasms in Conditions Secondary to Sports Injuries (Charley-rse A male, age 20, with severe cramping in thigh after sports injury is treated by administration of a short duration toxin, possible low dose (0.1-25 units) 15 of Preferably type F to the muscle and neighboring C muscles which are in contraction ("cramped"). Relief of pain occurs in 1-7 days.

Example 9 20 The Use of Botulinum toxin TDyes A-G in the STreatment of Muscle Spasms and Control of Pain Associated with Muscle Spasms in Smooth Muscle *"Disorders Such as Gastrointestinal Muscles o A female, age 35, with spastic colitis, is treated with 1-100 units of Botulinum toxin divided into_ several--areas-enema- (L-5-un-i-ts-)-del-ivered-in the standard enema volume, titrate dose, starting with the lowest dose. Injection is to the rectum or lower colon or a low dose enema may be employed. Cramps and pain associated with spastic colon are relieved in 1-10 days.

-19- Example The Use of Botulinum toxin Types A-G in the Treatment of Muscle Spasms and Control of Pain Associated with Muscle Spasms in Spasticity Conditions Secondary to Stroke, Traumatic Brain or Spinal Cord Injury A male, age 70, post-stroke or cerebral vascular event, is injected with 50 to 300 units of Botulinum toxin in the major muscles involved in severe closing of hand and curling of wrist and forearm or the muscles involved in the closing of the legs such that the patient and attendant have difficulty with hygiene. Relief of these symptoms occurs in 7 to 21 .15 days.

Example 11 The Use of Botulinum toxin Types A-G in the 'Treatment of Patients with Swallowing disorders A patient with a swallowing disorder caused by excessive throat muscle spasms is injected with about 1 to about 300 units of Botulinum toxin in the throat muscles. Relief the swallowing disorder occurs in 25 about 7 to about 21 days.

Example 12 The Use of Botulinua toxin Types A-G in the Treatment of Patients with Tension Headache A patient with a tension headache caused by excessive throat muscle spasms is injected with about 1 to about 300 units of Botulinum toxin in muscles of the head and upper neck. Relief of the tension headache occurs in about 1 to about 7 days.

Although there has been hereinabove described a use of Botulinum toxins for treating various disorders, conditions and pain, in accordance with the present invention, for the purpose of illustrating the manner in which the invention may be used to advantage, it should be appreciated that the invention is not limited thereto since many obvious modifications can be made, and it is intended to include within this invention any such modifications as will fall within 20 the scope of the appended claims. Accordingly, any and all modifications, variations, or equivalent arrangements which may occur to those skilled in the art, should be considered to be within the scope of the present invention as defined in the appended S 25 claims.

The reference to any prior art in this specification is not, and should not be taken as, an acknowledgment or any form of suggestion that that prior art forms part of the common general knowledge in Australia.

Claims (9)

1. A method for treating a swallowing disorder, the method comprising the step of administering to a patient an effective amount of a botulinum toxin in order to treat a swallowing disorder.

2. The method of claim 1, wherein the swallowing disorder is a cholinergic influenced swallowing disorder.

3. The method of claim 1, wherein the botulinum toxin is botulinum toxin type A.

4. The method of claim 1, wherein the botulinum toxin is selected from the group consisting of botulinum toxin types A, B, C, D, E, F and G. *o

5. The method of claim 1, wherein the botulinum toxin is administered in an amount of between about 0.01 units and about 500 units.

6. The method of claim 1, wherein the botulinum toxin is administered in an amount of between about 1 unit and about 300 units.

7. The method of claim 1, wherein the botulinum toxin is administered in an "amount of between about 0.01 units and about 50 units.

8. The method of claim 1, wherein the swallowing disorder is caused by throat muscle spasms.

9. A method for treating a cholinergic influenced swallowing disorder of a human patient, the method comprising the step of administering to a human patient suffering from dysphagia a therapeutically effective amount of botulinum toxin type A in order to alleviate the swallowing disorder. P.\WPDOCS\KDRSPECS\DIVf, CLAIMSDOC.II Fcbmnar 2(XXI -22- Use of a botulinum. toxin in the preparation of a medicament for the treatment of a swallowing disorder. DATED this 11Ith day of February 2000 ALLERGAN SALES, INC. By their Patent Attorneys DAVIES COLLISON CAVE o P \WPDOCSNKDF\SPECS\DIV 6 CLAIMSDOC.I I Febnm.,r