Method of preparing a pharmaceutical composition and pharmaceutical compositions obtainable thereby
First Claim
1. A method for the preparation of an aqueous pharmaceutical composition comprising:
- a) 0.005 to 10% by wt of one or more water-soluble pharmaceutically active ingredients or pharmaceutically acceptable salts thereof;
b) from 0.01 to 10% by wt hydroxypropyl methyl cellulose, having a viscosity of from 2500 to 5500 cps (mPa·
s); and
c) a buffer for maintaining the pH of the aqueous pharmaceutical composition from 5 to 7;
wherein the method comprises;
i) dissolving the above components in water to form an aqueous solution; and
ii) filtering the aqueous solution formed in i) through a sieve to form an aqueous pharmaceutical composition;
characterised in that;
the sieve through which the aqueous solution is filtered has a mesh size from ≧
1 micron but ≦
10 microns.
1 Assignment
0 Petitions
Accused Products
Abstract
An aqueous pharmaceutical composition comprising: a) 0.005 to 10% by wt of one or more water-soluble pharmaceutically active ingredients or pharmaceutically acceptable salts thereof; b) from 0.01 to 10% by wt hydroxypropyl methyl cellulose having a viscosity of from 2500 to 5500 cps (mPa·s); and c) a buffer for maintaining the pH of the aqueous pharmaceutical composition from 5 to 7; can be prepared by a method which comprises: i) dissolving the above components in water to form an aqueous solution, and ii) filtering the aqueous solution formed in i) through a sieve having a mesh size from ≧1 micron but ≦10 microns. The compositions obtainable by this method are capable of demonstrating improved mucoadhesive consistency and stability.
25 Citations
45 Claims
-
1. A method for the preparation of an aqueous pharmaceutical composition comprising:
-
a) 0.005 to 10% by wt of one or more water-soluble pharmaceutically active ingredients or pharmaceutically acceptable salts thereof;
b) from 0.01 to 10% by wt hydroxypropyl methyl cellulose, having a viscosity of from 2500 to 5500 cps (mPa·
s); and
c) a buffer for maintaining the pH of the aqueous pharmaceutical composition from 5 to 7;
wherein the method comprises;
i) dissolving the above components in water to form an aqueous solution; and
ii) filtering the aqueous solution formed in i) through a sieve to form an aqueous pharmaceutical composition;
characterised in that;
the sieve through which the aqueous solution is filtered has a mesh size from ≧
1 micron but ≦
10 microns. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 33, 34, 35, 36, 37, 38, 39)
-
-
25. A method for the preparation of an aqueous nasal pharmaceutical composition comprising:
-
a) 0.005 to 10% by wt, preferably 0.01 to 5% by wt, more preferably 0.25 to 2.5 wt %, most preferably 0.25 to 1.5% by wt of one or more water-soluble pharmaceutically active ingredients suitable for nasal administration;
b) from 0.01 to 10% by wt, preferably from 0.05 to 5% by wt, more preferably 0.1 to 5% by wt, most preferably 0.1 to 2% by wt, hydroxypropyl methyl cellulose having a viscosity of from 2500 to 5500 cps (mPa·
s), preferably more than 3000 to less than 5000 cps (mPa·
s), more preferably from 3200 to 4800 cps (mPa·
s), andc) a buffer for maintaining the pH of the aqueous pharmaceutical composition at from 5 to 7, wherein the method comprises;
i) dissolving the above components in water to form an aqueous solution, and ii) filtering the aqueous solution formed in i) through a sieve to form an aqueous nasal pharmaceutical composition;
characterised in the that the sieve through which the aqueous solution is filtered has a mesh size from ≧
1 micron but ≦
10 microns, preferably from 1.5 to 5 microns, most preferably 2 to 4 microns, e.g. 3 microns. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 40, 41, 42, 43, 44, 45)
-
Specification