Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Tablets – lozenges – or pills
Reexamination Certificate
1998-09-30
2001-03-06
Page, Thurman K. (Department: 1615)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Tablets, lozenges, or pills
C424S464000, C514S292000, C514S233200
Reexamination Certificate
active
06197339
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is a pharmaceutical tablet formulation of (R)-5,6-dihydro-5-(methylamino)-4H-imidazo[4,5-ij]-quinolin-2(1H)-one (Z)-2-butenedioate (1:1) and a method of using it to treat Parkinson's disease.
2. Description of the Related Art
U.S. Pat. No. 5,273,975 generically claims (R)-5,6-dihydro-5-(methylamino)-4H-imidazo[4,5-ij]-quinolin-2(1H)-one (Z)-2-butenedioate (1:1), but does not disclosed it. It generically discloses that compounds are useful for treating Parkinson's disease.
U.S. Pat. No. 4,389,393 claims a sustained release pharmaceutical tablet formulation with less than 25.8% hydroxypropyl methylcellulose. Hydroxypropyl methylcellulose has been used extensively for producing sustained release (slow disintegration) tablet formulations.
U.S. Pat. No. 5,000,962 discloses a long acting tablet formulation which comprises more than 35 to 60% (by weight) of hydroxypropyl methylcellulose and lactose was used as an excipient. The present invention uses no lactose.
Dow's 1995 Formulating for Controlled Release With Methocel Premium Cellulose Ethers in FIG. 24 on page 21 discloses the use of starch with Methocel (hydroxypropyl methocellulose) for producing tablets containing theophylline. The tablets of the present invention do not contain theophylline but rather (R)-5,6-dihydro-5-(methylamino)-4H-imidazo[4,5-ij]-quinolin-2(1H)-one (Z)-2-butenedioate (1:1). FIG. 20 on page 20 discloses a relationship between tablet size and the percent released with lactose. Normally starch is used in an amount up to about 15-20% for immediate release tablet formulations. However, in sustained release formulations it is not used because it is preceived to promote disintergation. Dow discloses the use of starch (excipient) at an amount of 52.6%. The tablet formulation of the present invention uses starch in an amount of more than 60%.
International Publication WO97/34932 discloses pharmaceutical tablets containing mechanically damaged starch which provide delayed, controlled and targeted release formulations. The present invention does not use mechanically damaged starch.
International Publication WO97/37639 discloses a controlled-release pharmaceutical tablet containing cross-linked amylose and hydroxypropylmethylcellulose and 10-30% of hydroxypropyl methylcellulose. The tablet formulation of the present invention uses no cross-linked amylose and has from 30-40% hydroxypropyl methylcellulose.
SUMMARY OF INVENTION
Disclosed is a pharmaceutical composition which is a sustained release tablet for oral ingestion which comprises:
(a)
(R)-5,6-dihydro-5-(methylamino)-4H-imidazo[4,5-ij]-
0.3%-16%
quinolin-2(1H)-one (Z)-2-butenedioate (1:1)
(b)
starch
60%-69%
(c)
hydroxypropyl methylcellulose
30%-40%
Further disclosed is a method of treating humans who have Parkinson's disease which comprises orally administering an anti-Parkinson's effective amount of (R)-5,6-dihydro-5-(methylamino)-4H-imidazo[4,5-ij]-quinolin-2(1H)-one (Z)-2-butenedioate (1:1).
DETAILED DESCRIPTION OF THE INVENTION
(R)-5,6-dihydro-5-(methylamino)-4H-imidazo[4,5-ij]-quinolin-2(1H)-one (Z)-2-butenedioate (1:1) is made according to the process set forth in CHART A and in EXAMPLEs 1 thru 8.
It is preferred that (R)-5,6-dihydro-5-(methylamino)-4H-imidazo[4,5-ij]-quinolin-2(1H)-one (Z)-2-butenedioate (1:1) be administered as a capsule or tablet, more preferably a tablet. The tablet formulation contains the following components, the pharmacologically active ingredient, starch and hydroxypropyl methylcellulose.
The amount of the active ingredient, (R)-5,6-dihydro-5-(methylamino)-4H-imidazo[4,5-ij]-quinolin-2(1H)-one (Z)-2-butenedioate (1:1), per tablet is from about 0.3% (1 mg) to about 16% (56 mg) of (R)-5,6-dihydro-5-(methylamino)-4H-imidazo[4,5-ij]-quinolin-2(1H)-one (Z)-2-butenedioate (1:1); preferably from about 0.44% (1.5 mg) to about 10% (35 mg) of (R)-5,6-dihydro-5-(methylamino)-4H-imidazo[4,5-ij]-quinolin-2(1H)-one (Z)-2-butenedioate (1:1)/tablet. Note that 1 mg of (R)-5,6-dihydro-5-(methylamino)-4H-imidazo[4,5-ij]-quinolin-2(1H)-one (Z)-2-butenedioate salt is equivalent to about 0.63 mg of the free base, (R)-5,6-dihydro-5-(methylamino)-4H-imidazo[4,5-ij]-quinolin-2(1H)-one. It is preferred that the tablet be about 350 mg in total weight.
Many different starches are useful and can be used in place of each other or in combination with each other as mixtures. They include potato, corn, wheat, pregelatinized, sodium starch glycolate and equivalents thereof. It is preferred that the starch be either corn or pregelatinized starch, or a mixture thereof. The starch should be present in an amount of from about 60 to about 69%.
The hydroxypropyl methylcellulose should be present in an amount of from about 30 to about 40%. It is preferred that the hydroxypropyl methylcellulose be selected from the group consisting of hydroxypropyl methylcellulose 2208 USP 100 cps, hydroxypropyl methylcellulose 2208 USP 4,000 cps, hydroxypropyl methylcellulose 2208 USP 15,000 cps, hydroxypropyl methylcellulose 2208 USP 100,000 cps, hydroxypropyl methylcellulose 2910 USP 4,000 cps, hydroxypropyl methylcellulose 2910 USP 10,000 cps, or mixtures thereof. It is preferred that the hydroxypropyl methylcellulose be hydroxypropyl methylcellulose 2208 USP 4,000 cps or hydroxypropyl methylcellulose 2910 USP 4,000 cps. The hydroxypropyl methylcellulose can be any of the hydroxypropyl methylcelluloses individually or mixtures thereof.
It is preferable that the tablets contain magnesium stearate but it is not required. If magnesium stearate is present, it should be in an amount of from about 0.2 to about 2.0%.
It is preferable that the tablets contain colloidal silicon dioxide but it is not required. If colloidal silicon dioxide is present, it should be in an amount of from about 0.2 to about 1.0%.
As is known to those skilled in the art, other agents such as sweeteners, coloring agents, coatings, etc can be added to the tablet.
The tablet is made by either direct compression or wet granulation, both processes are well known to those skilled in the art. If the direct compression method is used, the active ingredient (R)-5,6-dihydro-5-(methylamino)-4H-imidazo[4,5-ij]-quinolin-2(1H)-one (Z)-2-butenedioate (1:1), the starch and the hydroxypropyl methylcellulose (and colloidal silicon dioxide, if used) are first individually screened and then mixed in an appropriate size container or blender. If magnesium stearate is used it also is screened and mixed with a portion of the material from the container or blender and then all the materials are thoroughly mixed. This lubricated mixture is compressed into tablets of desired weight and physical specifications by methods known to those skilled in the art.
If the wet granulation method is used, a binder solution is prepared using hydroxypropyl cellulose or povidone (PVP). The binder solution is sprayed into a mixture of the pharmaceutically active ingredient, (R)-5,6-dihydro-5-(methylamino)-4H-imidazo[4,5-ij]-quinolin-2(1H)-one (Z)-2-butenedioate (1:1) and a portion of the other ingredients except the lubricant (magnesium stearate). The wet granules should be dried in a dryer such as a fluidized bed. The dry mixture should then be mixed with the lubricant and the remaining ingredients to form the final mixture which is compressed into tablets of desired weight and physical specifications by methods known to those skilled in the art.
(R)-5,6-Dihydro-5-(methylamino)-4H-imidazo[4,5-ij]-quinolin-2(1H)-one (Z)-2-butenedioate (1:1) is used in the treatment of Parkinson's disease. It is administered twice a daily orally in the form of a tablet or capsule, preferably a tablet. Since Parkinson's disease is disease of the elderly and children are not involved, the drug is not expressed as mg/kg but rather as the amount per day. It is preferred that (R)-5,6-dihydro-5-(methylamino)-4H-imidazo[4
Page Thurman K.
Pharmacia & Upjohn Company
Seidleck Brian K.
Stein Bruce
LandOfFree
Sustained release tablet formulation to treat... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Sustained release tablet formulation to treat..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sustained release tablet formulation to treat... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2465889