Oxazolidinone tablet formulation

Details Oxazolidinone tablet formulation Oxazolidinone tablet formulation

2001-03-15

2003-02-04

Page, Thurman K. (Department: 1615)

Drug, bio-affecting and body treating compositions

Preparations characterized by special physical form

Tablets, lozenges, or pills

C424S464000, C424S476000, C424S489000, C424S490000, C424S497000, C424S499000, C424S502000

Reexamination Certificate

active

06514529

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is a novel tablet formulation which permits high drug load and does not use lactose.
2. Description of the Related Art
Oxazolidinones are well known to those skilled in the art as gram positive anti-bacterial agents, see, for example, U.S. Pat. Nos. 5,688,792, 5,529,998, 5,547,950, 5,627,181, 5,700,799, 5,843,967, 5,792,765, 5,684,023, 5,861,413, 5,827,857, 5,869,659, 5,698,574, 5,968,962 and 5,981,528.
Various tablet formulations are very well known to those skilled in the art which contain starch, microcrystalline cellulose, hydroxypropylcellulose and other ingredients. However, it is very difficult to get high drug load and blood levels similar to IV administration.
SUMMARY OF INVENTION
Disclosed is a compressed tablet containing the following ingredients:
antibacterial oxazolidinone,
starch,
microcrystalline cellulose,
binder selected from the group consisting of hydroxypropylcellulose, hydroxypropylmethylcellulose, povidone and corn starch paste,
disintegrants selected from the group consisting of sodium starch glycolate, crosscarmellose sodium, crospovidone and low substituted hydroxypropylcellulose and
lubricant selected from the group consisting of stearic acid, metalic salts of stearic acid, hydrogenated vegetable oil and talc.
Also disclosed is a method for providing blood levels of an antibacterial oxazolidinone by oral administration medically equivalent to the blood levels produced by IV administration of the same antibacterial oxazolidinone which comprises administration of a compressed tablet of the formulation:
antibacterial oxazolidinone,
starch,
microcrystalline cellulose,
binder selected from the group consisting of hydroxypropylcellulose, hydroxypropylmethylcellulose, povidone and corn starch paste,
hydroxypropylcellulose,
disintegrants selected from the group consisting of sodium starch glycolate, crosscarmellose sodium, crospovidone and low substituted hydroxypropylcellulose and
lubricant selected from the group consisting of stearic acid, metalic salts of stearic acid, hydrogenated vegetable oil and talc.
DETAILED DESCRIPTION OF THE INVENTION
Oxazolidinones are a new class of gram positive antibacterial agents which are known to those skilled in the art, see for example U.S. Pat. No. 5,688,792. (S)-N-[[3-[3-fluoro-4-(4-morpholinyl)phenyl]-2-oxo-5-oxazolidinyl]methyl]acetamide, known as linezolid, the compound of Example 5 of U.S. Pat. No. 5,688,792 is known and has the following chemical structural formula:
(S)-N-[[3-[3-fluoro-4-[4-(hydroxyacetyl)-1-piperazinyl]-phenyl]-2-oxo-5-oxazolidinyl]methyl]acetamide, known as eperezolid, the compound of Example 8 of U.S. Pat. No. 5,837,870 is known and has the following chemical structural formula:
(S)-N-[[3-[3-fluoro-4-(tetrahydro-2H-thiopyran-4-yl)phenyl]-2-oxo-5-oxazolidinyl]methyl]acetamide S,S-dioxide the compound of Example 51 of U.S. Pat. No. 5,968,962 has the following chemical structural formula:
Linezolid and eperezolid can be produced by the processes set forth in U.S. Pat. Nos. 5,688,791 and 5,837,870 as well as that of International Publication W099/24393. They are preferably produced by the process of U.S. Pat. No. 5,837,870. (S)-N-[[3-[3-fluoro-4-(tetrahydro-2H-thiopyran-4-yl)phenyl]-2-oxo-5-oxazolidinyl]methyl]acetamide S,S-dioxide can be produced by the process of U.S. Pat. No. 5,968,962 or the process of U.S. patent application Ser. No. 60/118,150; it is preferred that it be produced by the process of U.S. patent application Ser. No. 60/118,150.
When the antibacterial oxazolidinone is linezolid, it is preferred that linezolid produced be used in crystal form II, which has the characteristics set forth in CHART A. Once linezolid is synthesized, crystal Form II is prepared by starting with linezolid of high enantiomeric purity. It is preferred that the linezolid be more than 98% enantiomerically pure, it is more preferred that the linezolid be more than 99% pure and it is even more preferred that the linezolid be 99.5% pure. The linezolid of greater than 98% enantiomeric purity to be used to form crystal form II can either be in solution or be a solid. The linezolid starting material, solid or solution, is mixed with a solvent selected from the group consisting of compounds of the formula: water, acetonitrile, chloroform, methylene chloride, R
1
—OH where R
1
is C
1
-C
6
alkyl; R
1
—CO—R
2
where R
2
is C
1
-C
6
alkyl and R
1
is as defined above; phenyl substituted with 1 thru 3 R
1
where R
1
is as defined above; R
1
—CO—O—R
2
where R
1
is C
1
-C
6
alkyl and R
1
is as defined above; R
1
—O—R
2
where R
1
is C
1
-C
6
alkyl and R
1
is as defined above. It is preferred that the solvent be selected from the group consisting of water, ethyl acetate, methanol, ethanol, propanol, isopropanol, butanol, acetonitrile, acetone, methyl ethyl ketone, chloroform, methylene chloride, toluene, xylene, diethyl ether, or methyl-t-butyl ether. It is more preferred that the solvent be ethyl acetate, acetone, acetonitrile, propanol, or isopropanol. It is most preferred that the solvent be ethyl acetate. The mixture of linezolid in the solvent is agitated at a temperature below 80° until crystals of Form II are formed and crystals of other solid forms, such as Form I, disappear. It is preferred to dissolve the linezolid in ethyl acetate at a temperature near the boiling point of the solvent. This mixture is cooled to a temperature of about 70°. The mixture may be seeded with crystals of Form II to facilitate crystallization. It is preferred that the solid product is cooled and agitated at a temperature between about 45° and about 60° until the solids consist only of Form II crystals. It is most preferred to maintain the slurry at a temperature of about 55°. It is preferred to mix the linezolid and solvent for at least 10 min, it is even more preferred to mix the linezolid and solvent for at least 20 min and it is most preferred to mix the linezolid and solvent for at least 30 min. The time and temperature will vary depending on the solvent selected. With ethyl acetate it is preferred to mix for not less that 60 minutes. The crystalline slurry may be further cooled to improve yield, and the solid Form II product may be isolated. The mixture may be further cooled and agitated. Other measures which can be used to facilitate crystallization include, but are not limited to, cooling, concentration of the solution by evaporation or distillation, or through addition of other solvents. The crystals are isolated by procedures known to those skilled in the art.
The preferred solid oral dosage form is a tablet. The composition of the tablets of the present invention can vary but includes the following essential features:
antibacterial oxazolidinone, starch,
microcrystalline cellulose,
binder selected from the group consisting of hydroxypropylcellulose, hydroxypropylmethylcellulose, povidone and corn starch paste,
disintegrants selected from the group consisting of sodium starch glycolate, crosscarmellose sodium, crospovidone and low substituted hydroxypropylcellulose and
lubricant selected from the group consisting of stearic acid, metalic salts of stearic acid, hydrogenated vegetable oil and talc.
It is preferred that the antibacterial oxazolidinone is selected from the group consisting of linezolid, eperezolid and (S)-N-[[3-[3-fluoro-4-(tetrahydro-2H-thiopyran-4-yl)phenyl]-2-oxo-5-oxazolidinyl]methyl]acetamide S,S-dioxide. It is more preferred that the antibacterial oxazolidinone is linezolid. It is preferred that the linezolid is in crystal form II. It is preferred that the starch is corn starch. It is preferred that the binder is hydroxypropylcellulose and that the disintegrant is sodium starch glycolate. It is preferred that the lubricant is magnesium sterarte. It is preferred that the tablet is film coated. It is also preferred that the tablet has a hardness range is from abo

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