NZ719346B2 - Method for preparing dry powder inhalation compositions - Google Patents

Abstract

method for preparing dry powder inhalation compositions which comprise two or more active ingredients and inert particulate excipient, and a method for adjusting the performance of such compositions is described. The method comprises mixing the first active ingredient and a portion of the second active ingredient with a first excipient to provide a first preblend, mixing the remaining portion of the second active ingredient with a second excipient to provide a second preblend, and finally mixing the first and the second preblends together, wherein the two excipient grades differ in their median particle size. The FPD level of second active ingredient can be adjusted simply by changing the ratio how it is divided between the first and the second excipient. ctive ingredient with a first excipient to provide a first preblend, mixing the remaining portion of the second active ingredient with a second excipient to provide a second preblend, and finally mixing the first and the second preblends together, wherein the two excipient grades differ in their median particle size. The FPD level of second active ingredient can be adjusted simply by changing the ratio how it is divided between the first and the second excipient.

Description

METHOD FOR PREPARING DRY POWDER INHALATION COMPOSITIONS Field of the ion The invention relates to a method for preparing dry powder inhalation itions which comprise two or more active ingredients and inert particulate ent, and to a method for adjusting the performance of such compositions.

Background of the Invention Inhaled ments for the treatment of respiratory diseases such as asthma and COPD are often formulated as dry powders and are red using a dry-powder inhaler (DPI). The medicaments are micronized such as to have a respirable aerodynamic diameter which is typically in the region of 0.5 to 10 µm. Such micronized particles tend to be cohesive and have poor flow properties. To se flowability and dosing accuracy the fine drug particles of respirable size are typically mixed with coarser excipient particles to form an ordered mixture, wherein fine drug les are ed to the coarser excipient particles. This technique necessitates the break-up of the drug/excipient agglomerates before they enter the patient's mouth and throat, where individual large particles and agglomerated large and small particles tend to deposit. Effective aerosolization and omeration of the powder requires that forces exerted on particles (e. g. forces between particles and surfaces of the device, between drug particles and excipient particles or between drug particles themselves) must be overcome such that high fine particle dose (FPD) of medicament particles in the respirable size is obtained. Improvements in FPD and dose uniformity have been reported by suitably adjusting the size range of the excipient particles.

The interaction between the drug and the excipient is further complicated when the inhalation powder includes particles of two or more different active ingredients. In the pment of such combination products it is often desirable to adjust the FPD level of each active ingredient independently. However, this often proves to be ult as attempts to affect the FPD level of one active ingredient affect the FPD of the other active ingredient(s) of the combination as well.

Efforts to control the performance of dry powder inhalation products having two or more active ingredients have been recently reported. EP 2221048 discloses a method of first preblending each different active ingredient with different excipient (differing in their particle size) and, thereafter, blending the obtained nds er in a main blending procedure to obtain the final composition. The method allegedly enables adhesion of each of the active ingredient to one excipient, but not to other.

The FPD of one active substance could be then tuned independently from the other active substance by suitably adjusting the particle size of each excipient.

The method of EP 2221048 suffers from the drawback that various lactose grades with different particle size distribution are required for each tuning step. cial lactose grades may differ also in other teristics than particle size and unexpected effects in the FPD may occur. Thus, there is a need for simplified methods for adjusting the FPD level of each active substance ndently in inhaled dry powder combination products. It is an object of the t invention to go some way towards meeting this need, and/or to at least provide the public with a useful choice.

Summary of the Invention It has been found that FPD level of each active ingredient of the combination can be adjusted independently t the need to change the excipient grades used in the composition. This is achieved by providing two excipient grades which differ in their median le size, mixing the first active ingredient and a portion of the second active ingredient with a first excipient to e a first preblend, mixing the remaining portion of the second active ingredient with a second excipient to provide a second preblend, and finally mixing the first and the second preblends together.

The FPD level of second active ingredient can be adjusted simply by changing the ratio how it is divided between the first and the second excipient. Preblending with coarser excipient is found to be associated with a lower FPD level. Thus, the FPD value of the second active ingredient can be adjusted to the desired level by changing the portion of second active ingredient which is preblended with coarser excipient.

At the same time, the FPD level of the first active ingredient is only minimally affected.

Brief Description of the Drawings Figure 1a shows the ed changes in the fine particle dose (FPD) of salmeterol xinafoate by adjusting preblend parameters (percent of fine e and proportion of salmeterol xinafoate preblended with coarser excipient).

Figure 1b shows the observed changes in the FPD of fluticasone propionate in vitro using s preblend parameters (percent of fine lactose and proportion of salmeterol xinafoate preblended with coarser excipient).

Detailed Description of the Invention In one aspect, the present invention provides a method of preparing a dry powder inhalation ition comprising a first and a second active ingredient in micronized form comprising the steps of: (a) mixing the first active ient and a portion of the second active ingredient with a first particulate excipient to provide a first preblend; (b) mixing the remaining portion of the second active ingredient with a second particulate excipient to provide a second preblend; and (c) mixing the first and the second preblends together; wherein the first particulate excipient and the second particulate ent differ in their median particle size, such that VMD (volume median er) of the finer ulate excipient is less than 90 % of the VMD of the coarser particulate excipient.

The term “about” refers to a variation of 5 % from the indicated numeric value.

The term “finer particulate excipient”, as used herein, means the excipient selected from the first and the second particulate excipients which has the lowest VMD value.

The term “coarser particulate excipient”, as used herein, means the excipient selected from the first and the second particulate excipients which has the highest VMD value.

The term “micronized form” means particle size lower than about 10 µm, for example in the range between 0.5 to 10 µm, ularly in the range between 1 and 6 The particle size, for example volume median diameter (VMD), of the particulate material can be determined by a laser diffractometer (e.g. n Instruments Ltd, UK) using dry dispersion method and Fraunhofer approximation.

The term “comprising” as used in this ication and claims means sting at least in part of”. When interpreting statements in this specification and claims which include the term “comprising”, other es besides the features prefaced by this term in each statement can also be t. Related terms such as “comprise” and “comprises” are to be interpreted in similar manner.

In another , the present ion provides a method of preparing a dry powder inhalation composition comprising a first and a second active ingredient in micronized form comprising the steps of: (a) mixing the first active ingredient and a portion of the second active ingredient with a first particulate excipient having VMD within the range of from about 30 to about 70 µm to provide a first preblend; (b) mixing the remaining portion of the second active ingredient with a second ulate excipient having VMD within the range of from about 80 to about 150 µm to provide a second preblend; and (c) mixing the first and the second preblends, optionally with additional first or second particulate excipient, together and (d) optionally mixing the obtained blend with additional first or second particulate excipient.

The first and second active ingredients, which are understood herein to be different, can be generally any two active ingredients which are suitable for administration by inhalation in dry powders as a combination. In particular, the active ingredients may be selected from those that are useful in the treatment of respiratory diseases such as asthma and COPD. The present method can be used also in the preparation of dry powder inhalation compositions which incorporate more than two different active ingredients, for example in the preparation of a combination of three active ingredients.

According to one embodiment of the invention, the first and second active ingredients are selected from anti-inflammatory steroids and bronchodilators. es of anti-inflammatory steroids include, but are not limited to, budesonide, fluticasone, beclomethasone, ciclesonide, fluticasone, mometasone and ceutically acceptable salts thereof. Examples of odilators include, but are not limited to, formoterol, salmeterol, nium, arformoterol, erol, fenoterol, glycopyrronium, indacaterol, opium, olodaterol, salbutamol, tiotropium, umeclidinium, vilanterol and pharmaceutically acceptable salts thereof.

According to one particular ment of the invention, the first active ingredient is an anti-inflammatory steroid and the second active ingredient is a bronchodilator.

According to another ular embodiment of the invention, the first active ingredient is a bronchodilator and the second active ient is an flammatory steroid. According to another particular embodiment of the invention, the first active ingredient is budesonide or a pharmaceutically acceptable salt thereof and the second active ingredient is formoterol or a pharmaceutically acceptable salt thereof. According to still another particular embodiment of the invention, the first active ingredient is fluticasone or a pharmaceutically acceptable salt thereof and the second active ient is salmeterol or a pharmaceutically acceptable salt thereof.

The active ingredients should be in micronized form, i.e. having particle size lower than about 10 µm, for example in the range from about 0.5 to about 10 µm, particularly in the range from about 1 to about 6 µm, such as to be able to deposit target areas in the lungs. tional methods, such as milling, can be used to provide the active ingredients in micronized form.

The amount of the active ingredient in the dry powder inhalation composition can vary depending e.g. on the active ingredient and the type of dry powder inhaler used.

Generally, the amount of the active ingredient in the dry powder tion composition is within the range of 0.02 to 30 %, typically from 0.05 to 10 %, more typically from 0.1 to 5 %, per weight of the composition.

According to one embodiment of the invention, the excipient used in the dry powder inhalation ition is a mono- or disaccharide, particularly lactose or mannitol, for example alpha e monohydrate. In general, the particle size of the excipient is preferably such that it can be entrained in the air stream but not enter deeply into the lung. However, a small proportion of particles with respirable size (< 10 µm) can be present in the excipient as such fine particles of the excipient may help in attaining higher FPD . The VMD of the excipient, such as lactose, to be used in the composition is suitably in the range of, for example, from about 30 to about 150 µm. The excipient of desired VMD can be obtained from commercial sources or can be prepared using methods known in the art such as by blending together excipient powders of known le size or by sieving.

In the present method two particulate excipients are used which differ in their median particle size such that the VMD of the finer particulate excipient is less than 90 % of the VMD of the r particulate excipient. According to one embodiment of the invention, the VMD of the finer particulate excipient is less than 85 % of the VMD of the coarser particulate excipients. According to another embodiment of the invention, the VMD of the finer ulate ent is within the range of from about 30 to about 70 µm, for example from about 35 to about 65 µm, and the VMD of the coarser particulate excipient is within the range of from about 80 to about 150 µm, for example from about 90 to about 120 µm.

The weight ratio of the finer particulate ent to coarser particulate excipient in the dry powder inhalation composition may vary within a wide range, but is typically within the range of 0.2 to 5, more typically from 0.25 to 3, for example from 0.5 to 1.5.

Preferably, the first and the second particulate excipient is e.

In the first step of the mixing process, the entirety of the first active ingredient and a portion of the second active ingredient are mixed with a first particulate excipient (e.g. the finer particulate excipient) to provide a first nd. In this step the entirety or only a portion of the total first excipient may be used. If only a proportion of the first ent is used in this step, the proportion is typically 5 – 80 %, for example 10-75 %, of the total amount used in the composition. The rest of the first particulate excipient may then be used in subsequent blending steps. The components of the first preblend are mixed in a suitable ng device, for example a low shear powder mixer or high shear powder mixer. The mixing speed and mixing time may vary within a broad range depending on the ng device used but are in general selected such as to produce homogenous powder composition. The mixing speed may be for example in the range of 10 – 50 rpm, for e 20 - 40 rpm. The mixing time may be for example in the range of 1 to 60 min, for example 3 to 15 min.

The second nd is prepared by mixing the remaining portion of the second active ingredient with a second particulate excipient (e.g. the coarser particulate ent) to provide a second preblend. In this step the entirety or only a portion of the total second excipient may be used. If only a proportion of the second excipient is used in this step, the proportion is typically 1-50 %, for example 1-30 %, of the total amount used in the composition. The rest of the second particulate excipient may then be used in the final ng step. The same blending conditions as above can be utilized.

Next the first and the second preblends are suitably sieved and then mixed together.

If only a portion of the first excipient was used in the preparation of the first preblend, the rest of the first excipient (e.g. the rest of the finer particulate excipient) is mixed in this step with the first and the second preblends to obtain a blend containing the first and the second active ingredient. The blend is then preferably sieved. The same blending conditions as above can be utilized.

If only a n of the second excipient was used in the ation of the second preblend, the rest of the second excipient (e.g. the rest of the coarser particulate excipient) can now be mixed with the previously obtained blend containing the first and the second active ingredient such as to obtain the final dry powder inhalation composition. The same blending conditions as above can be utilized. The final ition can be filled in a suitable dry powder inhaler.

If desired, further excipients or active ingredients can be added to the composition during above mentioned mixing steps or during r mixing steps.

In the pment of dry powder inhalation compositions incorporating a combination of active ingredients there often occurs a desire to adjust the fine particle dose (FPD) of one active ingredient ndently of the other active ingredient. According to the present method, the FPD of the second active ingredient of the composition can be independently adjusted by simply changing the tion of the second active ingredient which is mixed with a first particulate excipient.

Preblending the active ingredient with coarser excipient is found to be ated with lower FPD level. Thus, in case the first particulate excipient is the finer particulate excipient, the FPD of the second active ingredient can be increased by increasing the proportion of the second active ingredient which is mixed with a first particulate excipient. Inversely, the FPD of the second active ingredient can be decreased by decreasing the proportion of the second active ingredient which is mixed with the first particulate excipient.

The invention is illustrated further with the following Examples.

Example 1.

A dry powder formulation for inhalation according to Table 1 was prepared.

Table 1. Dry powder formulation for inhalation erol fumarate dihydrate 1.71 g Budesonide 60.9 g Lactose A (VMD = 55 µm) 862 g Lactose B (VMD = 105 µm) 575 g A first preblend was ed by mixing 0.855 g of micronized formoterol fumarate dihydrate, 60.9 g of micronized budesonide and 287 g of lactose A in a swing-mix type powder mixer followed by sieving the mixture and blending it with the rest (575 g) of lactose A in a swing- mix type powder mixer. A second preblend was prepared by mixing 0.855 g of micronized formoterol fumarate dihydrate and 192 g of lactose B in a swing-mix type powder mixer followed by sieving the mixture and blending it with 192 g of lactose B in a swing-mix type powder mixer. The two preblends were ed by g and then mixed with the rest (191 g) of lactose B in a swing- mix type powder mixer to obtain the final formulation. The mixing time of each step was 5 min at 35 rpm.

Example 2. ence example) A dry powder formulation for inhalation according to Example 1 was prepared with the ion that all formoterol fumarate ate was incorporated in the second preblend (with lactose B).

Example 3. (Reference example) A dry powder formulation for inhalation according to Example 1 was ed with the exception that all formoterol fumarate dihydrate was incorporated in the first preblend (with lactose A).

Example 4.

The formulations of Examples 1, 2 and 3 were filled in Easyhaler® powder inhaler device and the FPD values for the active ingredients (formoterol fumarate dihydrate and budesonide) were determined in vitro using methods well known in the art. The results are shown in Table 2.

Table 2. Fine particle dose (FPD) values of formulations of Examples 1-3.

Example No. FPD of formoterol (µg/dose) FPD of budesonide (µg/dose) 2 2.8 137 1 3.1 139 3 3.6 133 It can be seen that FPD of formoterol fumarate dihydrate can be adjusted by blending part of formoterol fumarate dihydrate with lactose B (coarser e) while the FPD of budesonide is only minimally affected. The change in FPD is dependent on the proportion of formoterol which is blended with e B (coarser lactose).

Example 5.

A dry powder formulation for inhalation ing to Table 3 was prepared.

Table 3. Dry powder ation for inhalation Salmeterol xinafoate 1.9g Fluticasone propionate 13.0g Lactose A (VMD = 55 µm) 145.5g Lactose B (VMD = 105 µm) 339.6g A first preblend was prepared by mixing 0.95 g of micronized salmeterol xinafoate, 13.0 g of micronized fluticasone propionate and 107.3 g of lactose A in a swing- mix type powder mixer. A second preblend was prepared by mixing 0.95 g of micronized salmeterol xinafoate and 7.3 g of lactose B in a swing- mix type powder mixer. The two preblends were ed by g and then mixed with 38.2 g of lactose A in a swing- mix type powder mixer. The resulting mixture was sieved and finally mixed with 332.3 g of lactose B in a swing- mix type powder mixer to obtain the final formulation. The mixing time of each step was 5 min at 35 rpm.

Example 6. Effect of salmeterol/lactose ratio of the second nd on fine particle dose (FPD) It was studied how s in the ratio of salmeterol/lactose B in the second preblend affects the fine particle dose (FPD) of the final erol/fluticasone formulation. A series of salmeterol/fluticasone formulations were prepared as in the previous example with the exception that the proportion of salmeterol used in the second preblend was varied as well as the proportion of lactose A (of the total lactose) used in the ation. The formulations were filled in ler® powder inhaler device and the FPD values for the active ingredients were determined in vitro using methods well known in the art. The results were fitted in a mathematical model which demonstrates the effect of the variables on the FPD of the active ingredients.

The observed s in the FPD of salmeterol xinafoate and fluticasone nate are presented in Figure 1a and 1b, respectively. In the Figures the tion (% of total) of salmeterol xinafoate (SX) mixed with lactose A (finer lactose) in the first preblend is shown in x-axis. The proportion of lactose A (% of total lactose) used in the ition is shown in y-axis. The resulting FPD value of erol xinafoate is shown in Figure 1a as zones ranging from about 4 µg/dose to about 10 µg/dose.

The resulting FPD value of fluticasone nate is shown similarly in Figure 1b.

The Figures demonstrate that the FPD value (shown in a box) for each active ingredient of the composition can be increased by increasing the proportion of lactose A (finer lactose) in the composition. For example, the FPD of salmeterol can be increased from about 4 µg/dose to about 10 µg/dose by sing the proportion of lactose A (finer lactose) from 0 % to 30 % (Figure 1a). At the same time, the FPD of fluticasone increases from about 60 µg/dose to about 100 µg/dose (Figure 1b).

On the other hand, when part of salmeterol of the composition is blended with lactose B (coarser lactose), the FPD value of salmeterol is decreased. The decrease is dependent on the proportion of salmeterol which is blended with lactose B (coarser lactose). For example, when the ratio of lactose A to lactose B is fixed to 10:90 (i.e. proportion of lactose A is 10 %) in the composition, the FPD of salmeterol can be linearly decreased from about 7.2 µg/dose down to about 5.5 µg/dose by increasing the part of salmeterol which is blended with lactose B (coarser lactose) from 0 % to 100 %. This corresponds to a decrease of 24 % in the FPD of salmeterol.

Importantly, at the same time the FPD value of fluticasone drops only 5 % (from about 74 µg/dose to about 70 µg/dose). Thus, blending part of the second active ient of the combination with a second lactose grade differing in the particle size from the first lactose grade provides a method of adjusting the FPD of the second active ingredient while only minimally affecting the FPD of the first active ingredient of the composition.

In this specification where reference has been made to patent specifications, other external documents, or other sources of information, this is generally for the purpose of providing a t for discussing the features of the ion. Unless ically stated otherwise, reference to such external documents is not to be construed as an admission that such documents, or such sources of information, in any jurisdiction, are prior art, or form part of the common general knowledge in the art.

Claims (14)

1. A method of preparing a dry powder inhalation composition comprising a first and a second active ingredient in micronized form comprising the steps of: 5 (a) mixing the first active ingredient and a portion of the second active ingredient with a first particulate excipient to e a first preblend; (b) mixing the remaining portion of the second active ingredient with a second particulate excipient to provide a second preblend; and (c) mixing the first and the second preblends together; 10 wherein the first particulate excipient and the second particulate excipient differ in their median particle size, such that VMD e median diameter) of the finer ulate excipient is less than 90 % of the VMD of the r ulate excipient.

2. A method according to claim 1, wherein the VMD of the finer particulate 15 excipient is less than 85 % of the VMD of the coarser particulate excipient.

3. A method according to claim 1 or 2, wherein the VMD of the finer particulate excipient is within the range of from about 30 to about 70 µm and the VMD of the r particulate excipient is within the range of from about 80 to about 150 µm.

4. A method of preparing a dry powder inhalation composition comprising a 20 first and a second active ingredient in ized form comprising the steps of: (a) mixing the first active ingredient and a portion of the second active ingredient with a first ulate excipient having VMD within the range of from about 30 to about 70 µm to provide a first preblend; (b) mixing the remaining portion of the second active ingredient with a 25 second particulate excipient having VMD within the range of from about 80 to about 150 µm to provide a second preblend; and (c) mixing the first and the second preblends, optionally with additional first or second particulate excipient, together and (d) optionally mixing the obtained blend with additional first or second 30 particulate excipient.

5. A method according to any one of claims 1 to 4, n the first and second particulate excipient is lactose.

6. A method according to any one of claims 1 to 5, wherein the first and second active ingredients are selected from anti-inflammatory steroids and bronchodilators.

7. A method according to any one of claims 1 to 6, wherein the first active ingredient is an anti-inflammatory steroid and the second active ingredient is a bronchodilator.

8. A method according to any one of claims 1 to 6, wherein the first active 5 ingredient is a bronchodilator and the second active ingredient is an antiinflammatory steroid.

9. A method according to any one of claims 1 to 8, wherein the antiinflammatory steroid is budesonide, asone, beclomethasone or a pharmaceutically acceptable 10 salt thereof.

10. A method according to any one of claims 1 to 9, wherein the bronchodilator is formoterol, salmeterol or a pharmaceutically acceptable salt thereof.

11. A method according to claim 7, wherein the first active ient is budesonide or a pharmaceutically acceptable salt thereof and the second 15 active ingredient is formoterol or a ceutically acceptable salt thereof.

12. A method according to claim 7, wherein the first active ingredient is asone or a pharmaceutically acceptable salt thereof and the second active ingredient is salmeterol or a pharmaceutically acceptable salt thereof.

13. A method according to claim 7, wherein the first active 20 ingredient is beclomethasone or a pharmaceutically acceptable salt thereof and the second active ingredient is formoterol or a pharmaceutically acceptable salt thereof.

14. The method ing to any one of claims 1 to 13, ntially as herein described with reference to any example thereof and with or without reference to the accompanying drawings.