DPP-IV inhibitor combined with a further antidiabetic agent, tablets comprising such formulations, their use and process for their preparation

1. A pharmaceutical composition comprising 1-[(4-methyl-quinazolin-2-yl)methyl]-3-methyl-7-(2-butyn-1-yl)-8-(3-(R)-amino-piperidin-1-yl)-xanthine in a dosage of 2.5 mg or 5 mg, metformin hydrochloride, and a basic amino acid having an intramolecular amino group and alkaline characteristics in an amount sufficient to suppress degradation of said 1-[(4-methyl-quinazolin-2-yl)methyl]-3-methyl-7-(2-butyn-1-yl)-8-(3-(R)-amino-piperidin-1-yl)-xanthine, wherein the pharmaceutical composition is in the form of a tablet comprising a film-coat, which film-coated tablet comprises the following amounts (% by weight of total coated tablet mass):

0.1-0.5% of 1-[(4-methyl-quinazolin-2-yl)methyl]-3-methyl-7-(2-butyn-1-yl)-8-(3-(R) amino-piperidin-1-yl)-xanthine,

47-85% of metformin HCl,

0.07-2.2% of L-arginine as the basic amino acid,

3.9-8.1% of a binder,

2.3-5.9% of a first filler,

0-4.4% of a second filler,

0-33% of a third filler,

0.7-1.5% of a lubricant, and

0.1-0.5% of a glidant.

2. The pharmaceutical composition according to claim 1 , wherein the metformin hydrochloride is present in a dosage range from about 100 mg to about 1500 mg; or wherein the metformin hydrochloride is present in a dosage strength of 250, 500, 625, 750, 850 or 1000 mg; or wherein the metformin hydrochloride is present in a dosage strength of 500 mg, 850 mg or 1000 mg.

3. The pharmaceutical composition according to claim 1 , wherein L-arginine is present from about 1 mg to about 50 mg, or from about 1 mg to about 25 mg.

4. The pharmaceutical composition according to claim 1 , wherein the 1-[(4-methyl-quinazolin-2-yl)methyl]-3-methyl-7-(2-butyn-1-yl)-8-(3-(R)-amino-piperidin-1-yl)-xanthine and L-arginine are present in a weight ratio from about 1:20 to about 10:1, or from about 1:15 to about 10:1, or from about 1:10 to about 10:1.

5. The pharmaceutical composition according to claim 1 , wherein:

the first, second and third fillers are selected from the group consisting of D-mannitol, corn starch and pregelatinized starch;

the binder is copovidone;

the lubricant is magnesium stearate; and

the glidant is colloidal anhydrous silica.

6. The pharmaceutical composition according to claim 1 ; wherein the film-coated tablet is selected from the group consisting of a mono-layer tablet, a bi-layer tablet, a press-coated tablet, and a tablet which is film-coated for drug-loading.

7. The pharmaceutical composition according to claim 1 , wherein the film-coat comprises:

a film-coating agent;

a plasticizer;

optionally a glidant, and

optionally one or more pigments.

8. The pharmaceutical composition according to claim 1 , wherein the film-coated tablet is a mono-layer tablet.

9. The pharmaceutical composition according to claim 1 , which is an immediate release dosage form, characterized in that in a dissolution test after 45 minutes at least 75% by weight of each of 1-[(4-methyl-quinazolin-2-yl)methyl]-3-methyl-7-(2-butyn-1-yl)-8-(3-(R)-amino-piperidin-1-yl)-xanthine and metformin is dissolved.

10. The pharmaceutical composition according to claim 8 wherein:

the percentage of metformin hydrochloride is about 85% by weight of total tablet core,

the amount of 1-[(4-methyl-quinazolin-2-yl)methyl]-3-methyl-7-(2-butyn-1-yl)-8-(3-(R)-amino-piperidin-1-yl)-xanthine is about 0.2%-0.4% by weight of total tablet core,

the amount of L-arginine is about 2% by weight of total tablet core,

the tablet crushing strength is higher than or equal to 100 N,

the tablet friability is lower than or equal to 0.5%,

the tablet thickness is from about 5.7 to about 8.4 mm,

the tablet core weight is from about 590 to about 1180 mg, and/or

the tablet disintegration time is lower than or equal 15 min.