the preparation of the mixture of the two active compounds was carried out with the aid of a tumble mixer ( turbula mixer ; w . a . bachofen ag basle ). the soft pellets were prepared by transferring the fine active compounds to the bottom container of a sieve tower for particle size analysis ( retsch , frg ), and the container was exposed to vibrations until round active compound agglomerates resulted . two parts by weight of disodium cromoglycate and one part by weight of reproterol hydrochloride . the soft pellets were obtained according to the procedures of gb 1 , 569 , 612 and gb 1 , 520 , 247 . three parts by weight of disodium cromoglycate and two parts by weight of reproterol hydrochloride . 100 g of formulation are carefully tipped into a measuring cylinder . the volume read off represents the bulk volume . the filled measuring cylinder is attached to a compacted volume meter . 20 compactions are carried out . the volume read off represents the compacted volume ( see also voigt r ., lehrbuch der pharmazeutischen technologie [ textbook of pharmaceutical technology ], verlag chemie , 5th edition , page 148 ). the hausner factor is the ratio of bulk volume to compacted volume . the bed height was determined with the aid of a cylinder of diameter 42 mm , powder slowly being tipped in until a heap of maximum height resulted , whose height was measured . redispersion was determined with the aid of an inhaler and of a cascade impactor , by determining the contents in percent based on the initial weight which had been deposited on the second to fourth cascade . this experiment was carried out using two different volume flows . 266 . 8 g of micronized disodium cromoglycate and 133 . 2 g of micronized reproterol hydrochloride are sieved through a sieve of mesh width 0 . 125 mm and then added to a diosna mixer pwc dierks und söhne , osnabrück frg ). 600 . 0 g of commercially available lactose having a grain size distribution of 100 %& lt ; 800 μm , 12 %- 35 %& lt ; 400 μm and max 7 %& lt ; 200 μm are added thereto . mixing is then carried out for 30 min . the core agglomerates thus resulting are readily flowable and can be filled into an inhaler . the properties of these core agglomerates can be seen from experiment 1 ( page 8 ). 3000 g of micronized disodium cromoglycate and 200 . 0 g of micronized reproterol hydrochloride are sieved through a sieve of mesh width 0 . 125 mm and then added to a tumble mixer ( turbula mixer ; w . a . bachofen ag basle ). 500 . 0 g of commercially available lactose having a grain size distribution of 100 %& lt ; 800 μm , 12 %- 35 %& lt ; 400 μm and max 7 %& lt ; 200 μm are added thereto . mixing is then carried out for 30 min . the core agglomerates thus resulting are readily flowable and can be filled into an inhaler . the properties of these core agglomerates can be seen from experiment 2 ( page 9 ). 266 . 8 g of micronized disodium cromoglycate and 133 . 2 g of micronized reproterol hydrochloride are sieved with the aid of a 0 . 125 mm sieve and then added to a fluidizing mixer ( fukae powtec corporation , japan ). 600 . 0 g of commercially available sodium chloride having an average grain size of 300 μm are added thereto . mixing is then carried out for 10 min . the core agglomerates thus resulting are readily flowable and can be filled into an inhaler . 30 g of micronized budesonide are sieved with the aid of a 0 . 125 mm sieve and then added to a tumble mixer ( tubula mixer ; w . a . bachkofen [ sic ] ag , basle ). 270 g of commercially available lactose having a grain size distribution of 100 %& lt ; 800 μm , 12 %- 35 %& lt ; 400 μm and at most 7 %& lt ; 200 μm are added thereto . mixing is then carried out for 45 min . the core agglomerates thus resulting are readily flowable and can be filled into an inhaler , a cartridge or blister packs . 100 g of micronized salbutanol are sieved with the aid of a 0 . 125 mm sieve and then added to a tumble mixer ( tubula mixer ; w . a . bachkofen ag , basle ). 300 g of commercially available lactose having a grain size distribution of 100 %& lt ; 800 μm , 12 %- 35 %& lt ; 400 μm and at most 7 %& lt ; 200 μm are added thereto . mixing is then carried out for 45 min . the core agglomerates thus resulting are readily flowable and can be filled into an inhaler , a cartridge or blister packs . 20 g of micronized hecclometasone - 17 , 21 - dipropionate are sieved with the aid of a 0 . 125 mm sieve and then added to a tumble mixer ( turbula mixer ; w . a . bachofen ag , basle ). 380 g of commercially available lactose having a grain size distribution of 100 %& lt ; 800 μm , 12 %- 35 %& lt ; 400 μm and at most 7 %& lt ; 200 μm are added thereto . mixing is then carried out for 45 min . the core agglomerates resulting in this way are readily flowable and can be filled into an inhaler , a cartridge or blister packs . 20 g of micronized ipratropium bromide are sieved with the aid of a 0 . 125 μm sieve and then added to a tumble mixer ( turbula mixer ; w . a . bachofen ag , basle ). 380 g of commercially available lactose having a grain size distribution of 100 %& lt ; 800 μm , 12 %- 35 %& lt ; 400 μn and at most 7 %& lt ; 200 μm are added thereto . mixing is then carried out for 45 min . the core agglomerates resulting in this way are readily flowable and can be filled into an inhaler , a cartridge or blister packs .
a pharmaceutical formulation for administration by inhalation , a micronized active compound or micronized active compound mixture with a mean particle size of 0 . 1 μm to 10 μm being applied to a pharmaceutically acceptable excipient having a mean particle size of 200 μm to 1000 μm without the use of binders .