Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Tablets – lozenges – or pills
Reexamination Certificate
2000-01-28
2001-07-03
Page, Thurman K. (Department: 1615)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Tablets, lozenges, or pills
C424S464000, C424S472000, C424S474000, C424S480000, C427S002140, C427S002210
Reexamination Certificate
active
06254888
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing placebo tablets or positive control tablets, that are identical to tablets that contain active drugs. Clinical studies to determine the effectiveness of new drugs requires that identical tablets be prepared which contain an active drug, no drug (placebo) and/or a control drug. This is done in order to prevent the patients and investigators from knowing who is receiving the drug that is being tested and for this reason the clinical studies are usually referred to as being “double blind”. This is because neither the investigator nor the patient can tell from the packaging which dosage form is the new drug.
In the prior art when a drug manufacturer carried out a test of a product against a competitor's patented product, it was not unusual to request that the competitor prepare a blinded supply of the product. This would usually be done if the study protocol and results were shared with the competitor.
In the prior art, blinded samples have been prepared by over encapsulation, coating or debranding. Over encapsulation is a process whereby a dosage form, which is usually a tablet, is placed in a capsule. This procedure requires in some cases the use of an oversize capsule which may be difficult to swallow. This process is time consuming and strict quality controls are required to assure that the capsule and tablet are bioequivalent and are manufactured properly. The gelatin and moisture in the capsules may introduce stability problems. Overcoating of tablets has not been successful for embossed tablets because of the formation of ghost images in the areas where the tablets are embossed. The debranding of printed tablets and capsules is a labor intensive process that may raise the question of stability due to the use of solvents for manually deinking the printed matter on the dosage form.
When compendium products are involved, a generic formulation may have to be prepared which requires a development project where stability and bioequivalence have to be demonstrated.
A further alternative is a mill and fill process where tablets are milled and filled into capsules. This procedure maximally disturbs the original dosage form and questions relative to equivalence uniformity, stability and bioavailability must be resolved.
The applicant has devised a process of coating branded dosage forms which does not compromise the integrity of the branded pharmaceutical dosage form but provides an overcoat that is sufficient to cover all product indicia without interfering with the stability or the releasability of the drug.
The invention also provides a method for coating micro tablets for the purpose of “rounding” the micro tablets to facilitate the mechanical filling of the micro tablets into capsules; a method of isolating incompatible ingredients in micro tablets and a method of incoporating an additional active ingredient into the micro tablet. As used herein a micro tablet is a tablet which is generally considered to be less than 4 mm in diameter (if round) or less than 4 mm in longest dimension. They are prepared with the same ingredients as traditional tablets and capsules which include lactose, starch, microcrystalline cellulose, disintegrants, flow agents and lubricants.
SUMMARY OF THE INVENTION
The invention provides a process for coating a branded pharmaceutical dosage form for the purpose of covering any embossed or printed matter or any colored coating by the application of an amount of coating which is sufficient to obscure any identifying indicia without compromising the stability or releasability of the drug that is contained in the dosage form.
The invention also provides a method of coating a micro tablet to form a rounded tablet which may comprise any or all of the following:
(a) sealing said micro tablet by applying a seal coat to form a sealed micro tablet;
(b) applying to said micro tablet an effective amount of a coating which provides a smooth coating over said micro tablet to provide a smoothly coated micro tablet; and (c) polishing the tablet to form a polished and moisture resistant pharmaceutical dosage form.
A method of separating incompatible micro tablets is disclosed which may comprise any or all of the following:
(a) sealing the incompatible micro tablet by applying a seal coat to form sealed incompatible micro tablet;
(b) applying to said micro tablet an effective amount of coating which provides a smooth coating over micro tablet to provide a smoothly coated micro tablet; and
(c) polishing the coated micro tablet to form a polished and moisture resistant pharmaceutical dosage form.
In addition, there is disclosed a method of incorporating additional active ingredients into a micro tablet, said method may comprise any or all of the following:
(a) coating an active ingredient onto a micro tablet using a solution or suspension of said active ingredient to form a coated micro tablet;
(b) sealing said micro tablet by applying a seal coat to form a sealed micro tablet;
(c) applying to said sealed micro tablet an effective amount of a coating which provides a smooth coating over said micro tablet to provide a smoothly coated micro tablet; and
(d) polishing the smoothly coated micro tablet of step (c) to form a polished and moisture resistant pharmaceutical dosage form.
Accordingly, it is a primary object of the invention to provide a novel method of obscuring the identifying indicia on a pharmaceutical dosage form.
It is also an object of the invention to provide a method of obscuring the printed matter or indicia on a pharmaceutical dosage form without compromising the stability or bioavailability of the pharmaceutical dosage form.
It is also an object of the invention to provide a cost efficient process for obscuring the embossed or printed matter on a pharmaceutical dosage form.
These and other objects of the invention will become apparent from the present specification.
REFERENCES:
patent: 4255438 (1981-03-01), Kane et al.
patent: 5464833 (1995-11-01), Nakai et al.
patent: 5897910 (1999-04-01), Rosenberg et al.
Boehringer Ingelheim Pharmaceuticals Inc.
Devlin Mary-Ellen M.
Page Thurman K.
Raymond Robert P.
Stempel Alan R.
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