CA2225960C - Pharmaceutical compositions - Google Patents

Pharmaceutical compositions Download PDF

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Publication number
CA2225960C
CA2225960C CA002225960A CA2225960A CA2225960C CA 2225960 C CA2225960 C CA 2225960C CA 002225960 A CA002225960 A CA 002225960A CA 2225960 A CA2225960 A CA 2225960A CA 2225960 C CA2225960 C CA 2225960C
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Prior art keywords
rapamycin
composition
compositions
weight
compound
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CA002225960A
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CA2225960A1 (en
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Patrice Guitard
Barbara Haeberlin
Rainer Link
Friedrich Richter
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Novartis AG
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Novartis AG
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Priority claimed from GBGB9514397.0A external-priority patent/GB9514397D0/en
Priority claimed from GBGB9515025.6A external-priority patent/GB9515025D0/en
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Priority to CA002426956A priority Critical patent/CA2426956C/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/435—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with one nitrogen as the only ring hetero atom
    • A61K31/47—Quinolines; Isoquinolines
    • A61K31/4738—Quinolines; Isoquinolines ortho- or peri-condensed with heterocyclic ring systems
    • A61K31/4745—Quinolines; Isoquinolines ortho- or peri-condensed with heterocyclic ring systems condensed with ring systems having nitrogen as a ring hetero atom, e.g. phenantrolines
    • A—HUMAN NECESSITIES
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    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/435—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with one nitrogen as the only ring hetero atom
    • A61K31/4353—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with one nitrogen as the only ring hetero atom ortho- or peri-condensed with heterocyclic ring systems
    • A61K31/436—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with one nitrogen as the only ring hetero atom ortho- or peri-condensed with heterocyclic ring systems the heterocyclic ring system containing a six-membered ring having oxygen as a ring hetero atom, e.g. rapamycin
    • A—HUMAN NECESSITIES
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    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/435—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with one nitrogen as the only ring hetero atom
    • A61K31/44—Non condensed pyridines; Hydrogenated derivatives thereof
    • A61K31/445—Non condensed piperidines, e.g. piperocaine
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    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
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    • A61K9/141—Intimate drug-carrier mixtures characterised by the carrier, e.g. ordered mixtures, adsorbates, solid solutions, eutectica, co-dried, co-solubilised, co-kneaded, co-milled, co-ground products, co-precipitates, co-evaporates, co-extrudates, co-melts; Drug nanoparticles with adsorbed surface modifiers
    • A61K9/145—Intimate drug-carrier mixtures characterised by the carrier, e.g. ordered mixtures, adsorbates, solid solutions, eutectica, co-dried, co-solubilised, co-kneaded, co-milled, co-ground products, co-precipitates, co-evaporates, co-extrudates, co-melts; Drug nanoparticles with adsorbed surface modifiers with organic compounds
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    • A61K9/141—Intimate drug-carrier mixtures characterised by the carrier, e.g. ordered mixtures, adsorbates, solid solutions, eutectica, co-dried, co-solubilised, co-kneaded, co-milled, co-ground products, co-precipitates, co-evaporates, co-extrudates, co-melts; Drug nanoparticles with adsorbed surface modifiers
    • A61K9/146—Intimate drug-carrier mixtures characterised by the carrier, e.g. ordered mixtures, adsorbates, solid solutions, eutectica, co-dried, co-solubilised, co-kneaded, co-milled, co-ground products, co-precipitates, co-evaporates, co-extrudates, co-melts; Drug nanoparticles with adsorbed surface modifiers with organic macromolecular compounds
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Abstract

A pharmaceutical composition for oral administration in the form of a solid dispersion comprising a rapamycin or 33-epi-chloro-33-desoxy-ascomycin and a carrier medium.

Description

Pharmaceutical compositions This invention relates to oral pharmaceutical compositions comprising a macrolide, e.g. a rapamycin or an ascomycin, in a solid dispersion.
Rapamycin is an immunosuppressive lactam macrolide produceable, for example by Streptom cues by rg-oscopicus. The structure of rapamycin is given in Kesseler, H., et al.; 1993;
Helv. Chim. Acta; 76: 117. Rapamycin is an extremely potent immunosuppressant and has also been shown to have antitumor and antifungal activity. Its utility as a pharmaceutical, however, is restricted by its very low and variable bioavailability. Moreover, rapamycin is highly insoluble in aqueous media, e.g. water, making it difficult to formulate stable galenic compositions. Numerous derivatives of rapamycin are known. Certain 16-O-substituted rapamycins are disclosed in WO 94/02136. 40-O-substituted rapamycins are described in, e.g., US 5 258 389 and WO 94/09010 (O-aryl and O-alkyl rapamycins); WO 92/05179 (carboxylic acid esters), US 5 118 677 (amide esters), US 5 118 678 (carbamates), U5 5 100 883 (fluorinated esters), US 5 151 413 (acetals), US 5 120 842 (silyl ethers), WO 93/11130 (methylene rapamycin and derivatives), WO 94/02136 (methoxy derivatives), WO 94/02385 and WO 95/14023 (alkenyl derivatives). 32-O-dihydro or substituted rapamycin are described, e.g., in US
5 256 790.
Further rapamycin derivatives are described in PCT application number EP96/02441, for example 32-deoxorapamycin as described in Example 1, and 16-pent-2-ynyloxy-32(S)-dihydrorapamycin as described in Examples 2 and 3.
3 0 Rapamycin and its structurally similar analogues and derivatives are termed collectively herein as "rapamycins".
EP 240 773 discloses a solid dispersion composition comprising FR-900506 substance and a water-soluble polymer.
On oral administration to humans, solid rapamycins, e.g. rapamycin, may not be absorbed to any significant extent into the bloodstream. Simple mixtures are known for rapamycins, e.g.
rapamycin, with conventional pharmaceutical excipients; however, disadvantages encountered with these compositions include unpredictable dissolution rates, irregular bioavailability profiles, and instability. To date there is no conveniently administrable oral solid formulation available for rapamycin or a derivative thereof.
Accordingly, in one aspect, this invention provides a pharmaceutical composition in the form of a solid dispersion comprising a rapamycin or a rapamycin derivative and a carrier medium.
The compositions of this invention provide a high bioavailability of drug substance, are convenient to administer, and are stable.
The rapamycin used in the compositions of this invention may be any rapamycin or derivative thereof, for example as disclosed above or in the above-mentioned patent applications.
Thus the rapamycin used in the solid dispersion compositions of this invention may be rapamycin or an O-substituted derivative in which the hydroxyl group on the cyclohexyl ring of rapamycin is replaced by -OR, in which R, is hydroxyalkyl, hydroxyalkoxyalkyl, acylaminoalkyl and aminoalkyl; e.g. as described in W094/09010, for example 40-O-(2-hydroxy)ethyl-rapamycin, 40-O-(3-hydroxy)propyl-rapamycin, 40-O-[2-(2-hydroxy)ethoxy]
2 5 ethyl-rapamycin and 40-O-(2-acetaminoethyl)-rapamycin. The rapamycin derivative may be a 26- or 28-substituted derivative.
Preferred rapamycins for use in the solid dispersion compositions of this invention include rapamycin, 40-0-(2-hydroxy)ethyl rapamycin, 32-deoxorapamycin and 16-pent-2-ynyloxy-3 0 32(S)-dihydrorapamycin. A more preferred rapamycin is 40-0-(2-hydroxy)ethyl rapamycin (hereinafter referred to as compound X).

Numbering of rapamycin derivatives as used herein refers to the structure disclosed as Formula A at page 4 of published PCT application WO 96/13273.
The term solid dispersion as used herein is understood to mean a co-precipitate of the rapamycin, e.g. 40-0-(2-hydroxy)ethyl rapamycin or rapamycin, with the carrier medium. In the solid dispersion, the rapamycin is in amorphous or substantially amorphous form and is physically bound to the carrier medium.
Compositions of this invention may be administered in any convenient form, for example tablet, capsule, granule or powder form, e.g. in a sachet.
The rapamycin may be present in the composition in an amount of about 0.01 to about 30-weight-% based on the weight of the composition (% w/w), and preferably in an amount of 1 to 20 % w/w based on the total weight of the composition.
The carrier medium is present in an amount of up to 99.99% by weight, for example 10 to 95 wt-%, based on the total weight of the composition.
In one embodiment the carrier medium comprises a water-soluble polymer, preferably a cellulose derivative such as hydroxypropylmethylcellulose (HPMC), hydroxy propyl-methylcellulose phthalate, or polyvinylpyrrrolidone (PVP). Good results may be obtained using HPMC with a low apparent dynamic viscosity, e.g. below 100 cps as measured at 20°C
for a 2 % by weight aqueous solution, e.g below 50 cps, preferably below 20 cps, for example HPMC 3 cps. HPMC is well-known and described, for example, in the Handbook of Pharmaceutical Excipients, Second Edition, pub. Pharmaceutical Society of Great Britain and American Pharmaceutical Association, 1994, p. 229 to 232. HPMC, including HPMC
3cps, is available commercially under the trade mark Pharmacoat 603 from the Shinetsu Company.
PVP is available, for example, under the trade mark Povidone (Handbook of Pharmaceutical Excipients), and a PVP having an average molecular weight between about 8,000 and about 50,000 Daltons is preferred.
In another embodiment the carrier medium comprises - hydroxypropylcellulose (HPC) or a derivative thereof. Examples of HPC
derivatives include those having low dynamic viscosity in aqueous media, e.g. water, e.g below about 400 cps, e.g below 150 cps as measured in a 2% aqueous solution at 25°C.
Preferred HPC
derivatives have a low degree of substitution, and an average molecular weight below about 200,000 Daltons, e.g. between 50,000 and 150,000 Daltons. Examples of HPC
available TM
commercially include Klucel LF, Klucel EF and Klucel JF from the Aquaion Company; and TM
Nisso HPC-L available from Nippon Soda Ltd;
- a polyethylene glycol (PEG). Examples include PEGS having an average molecular weight between 1000 and 9000 Daltons, e.g. between about 1800 and 7000, for example PEG
2000, PEG 4000 or PEG 6000 (Handbook of Pharmaceutical Excipients);
- a saturated polyglycolised glyceride, available for example under the trade mark Gelucir, e.g. Gelucir 44!14, 53/10, 50/13, 42/12, or 35/10 from the Gattefosse company; or 2 0 - a cyclodextrin, for example a ~i-cyclodextrin or an a-cyclodextrin.
Examples of suitable (3-cyclodextrins include methyl-~-cyclodextrin; dimethyl-(3-cyclodextrin;
hydroxypropyl-~i-cyclodextrin; glycosyl-~i-cyclodextrin; maltosyl-~-cyclodextrin; sulfo-(3-cyclodextrin; sulfo-alkylethers of (3-cyclodextrin, e.g. sulfo-C,.~-alkyl ethers. Examples of a-cyclodextrins include glucosyl-a-cyclodextrin and maltosyl-oc-cyclodextrin.
The carrier medium may further comprise a water-soluble or water-insoluble saccharose or other acceptable carrier or filler such as lactose, or microcrystalline cellulose. The filler, if present, is generally in an amount of up to about 30% by weight, e.g. 0.5 to 20 wt-%, preferably, from about 5 to about 15% by weight of the composition.
Microcrystalline 3 0 cellulose is available commercially under the trade mark Avicel, for example from FMC
Corporation.

-S-The carrier medium may further comprise one or more surfactants, for example a non-ionic, ionic, anionic or amphoteric surfactant. Examples of suitable surfactants include - polyoxyethylene-polyoxypropylene co-polymers and block co-polymers known, for example, under the trade marks Pluronic or Poloxamer, e.g. as described in Fiedler, H. P.
"Lexikon der Hilfsstoffe fur Pharmazie, Kosmetik and angrenzende Gebiete", Editio Cantor, D-7960 Aulendorf, 3'~ revised and expanded edition (1989). A preferred polyoxyethylene-polyoxypropylene block polymer is Poloxamer 188 available from the BASF
Company;
- ethoxylated cholesterins known, for example, under the trade mark Solulan, for example Solulan C24 commercially available from the Amerchol Company;
- vitamin derivatives, e.g. vitamin E derivatives such as tocopherol polyethylene glycol succinate (TPGS) available from the Eastman Company;
- sodium dodecylsulfate or sodium laurylsulfate;
- a bile acid or salt thereof, for example cholic acid, glycolic acid or a salt, e.g. sodium 2 0 cholate; or lecithin.
If present in the compositions of this invention, the surfactants) is generally in an amount of 2 5 up to about 20%, for example 1 to I S% by weight.
One or more disintegrants may be included in the compositions of this invention. Examples of TM
disintegrants include Polyplasdone (Handbook of Pharmaceutical Excipients) available commercially from the ISPCompany; sodium starch glycolate available commercially from the 3 0 Generichem Company; and crosscarmelose sodium available under the trade mark Ac-di-sol from FMC Corporation. One or more lubricants, for example magnesium stearate or colloidal silicon dioxide, may further be included in the composition of this invention in an amount of up to about 5 weight %, e.g. 0.5 to 2wt-%, based on the weight of the composition.
It may be advantageous to include one or more flavouring agents in the compositions of this invention.
The present applicants have obtained good results using surfactant-free rapamycin compositions. In another aspect, therefore, this invention provides a surfactant-free solid dispersion composition comprising a rapa.mycin as described herein.
Antioxidants and/or stabilisers may be included in the compositions of this invention in an amount of up to about 1 % by weight, for example between 0.05 and 0.5 % by weight.
Examples of antioxidants include butylated hydroxytoluene, DL-a-tocopherol, propyl gallate, ascobyl palmitate and fumaric acid. Malonic acid is an appropriate stabiliser.
In one embodiment of this invention, the composition comprises up to 30% by weight, e.g. 1 to 20 wt-%, 40-0-(2-hydroxy)ethyl rapamycin, and up to 95 %, e.g. 30 to 90%, HPMC by weight.
2 0 The weight ratio of the rapamycin to carrier medium in the compositions of this invention is generally no more than 1:3, preferably less than 1:4.
In another aspect, this invention provides a process for preparing a solid dispersion composition as described herein.
In one embodiment the compositions of this invention may be obtained by dissolving or suspending the rapamycin and carrier medium in a solvent or solvent mixture.
The solvent may be a single solvent or mixture of solvents, and the order of dissolution and suspension of the rapamycin with the carrier medium in the solvent may be varied. Solvents suitable for use in 3 0 preparing solid dispersion compositions of this invention may be organic solvents such as an alcohol, for example methanol, ethanol, or isopropanol; an ester, e.g.
ethylacetate; an ether, e.g. diethyl ether; a ketone, e.g. acetone; or a halogenated hydrocarbon, e.g.
dichloroethane.
A convenient solvent mixture is an ethanol/acetone mixture having a weight ratio of ethanol to acetone of between about 1:10 to about 10:1, for example 1:5 to 5:1.
Typically the rapamycin and Garner medium are present in a ratio by weight with the solvent of 1:0.1 to 1:20. The solvent may be evaporated and the rapamycin co-precipitated with carrier medium. The resulting residue may be dried, for example under reduced pressure, sieved and milled. The milled dispersion may be combined with other excipients and, for example, compressed as a tablet, or filled into sachets or gelatin capsules.
In another embodiment, the solid dispersion compositions may be prepared by melting the carrier medium to form a melt, and combining the melt with the rapamycin, e.g.
by stirring, optionally in the presence of a solvent or solvent mixture as described herein.
Alternatively the solid dispersions of this invention may be prepared by spray drying techniques as described, for example, in Theory and Practice of Industrial Pharmacy, Lachmann et al., 1986. A suspension as formed above is dispersed through a nozzle into a chamber maintained at, for example, 20 to 80°C. The solvent is evaporated on passing through the nozzle, and finely dispersed particles are collected.
The compositions of this invention, after milling, typically have a mean particle size of less than about O.Smm, for example less than about 350 u,m, e.g. about 100 to about 300 u.m.
The oral compositions of this invention are useful for the known indications of the rapamycin, 2 5 e.g. the following conditions:
a) Treatment and prevention of organ or tissue alto- or xeno-transplant rejection, e.g. for the treatment of recipients of e.g. heart, lung, combined heart-lung, liver, kidney, pancreatic, skin or corneal transplants. They are also indicated for the prevention of graft-versus-host disease, such as following bone marrow transplantation.
3 0 b) Treatment and prevention of autoimmune disease and of inflammatory conditions, in particular inflammatory conditions with an etiology including an autoimmune ..g-component such as arthritis (for example rheumatoid arthritis, arthritis chronica progrediente and arthritis deformans) and rheumatic diseases. Specific autoimmune diseases for which the compounds of the invention may be employed include, autoimmune hematological disorders (including e.g. hemolytic anaemia, aplastic anaemia, pure red cell anaemia and idiopathic thrombocytopenia), systemic lupus erythematosus, polychondritis, sclerodoma, Wegener granulamatosis, dermatomyositis, chronic active hepatitis, myasthenia gravis, psoriasis, Steven-Johnson syndrome, idiopathic spree, autoimmune inflammatory bowel disease (including e.g. ulcerative colitis and Crohn's disease) endocrine ophthalmopathy, Graves disease, sarcoidosis, multiple sclerosis, primary billiary cirrhosis, juvenile diabetes (diabetes mellitus type I), uveitis (anterior and posterior), keratoconjunctivitis sicca and vernal keratoconjunctivitis, interstitial lung fibrosis, psoriatic arthritis, glomerulonephritis (with and without nephrotic syndrome, e.g. including idiopathic nephrotic syndrome or minimal change nephropathy) and juvenile dermatomyositis.
c) Treatment and prevention of asthma.
d) Treatment of mufti-drug resistance (MDR). MDR is particularly problematic in cancer patients and AIDS patients who will not respond to conventional chemotherapy because the medication is pumped out of the cells by Pgp. The compositions are therefore useful for enhancing the efficacy of other chemotherapeutic agents in the treatment and control of multidrug resistant conditions such as multidrug resistant cancer or multidrug resistant AIDS.
2 0 e) Treatment of proliferative disorders, e.g. tumors, hyperproliferative skin disorder and the like.
f) Treatment of fungal infections.
g) Treatment and prevention of inflammation, especially in potentiating the action of steroids.
2 5 h) Treatment and prevention of infection, especially infection by pathogens having Mip or Mip-like factors.
TM
i) Treatment of overdoses of FK-506 and other macrophilin binding immunosuppressants.
3 0 Where the pharmaceutical composition of this invention is in unit dosage form, e.g. as a tablet, capsule, granules or powder, each unit dosage will suitably contain between 1 mg and 100 mg of the drug substance, more preferably between 10 and 50 mg; for example 15, 20, 25, or 50 mg. Such unit dosage forms are suitable for administration 1 to 5 times daily depending upon the particular purpose of therapy, the phase of therapy and the like.
The exact amount of the compositions to be administered depends on several factors, for example the desired duration of treatment and the rate of release of the rapamycin.
The utility of the pharmaceutical compositions can be observed in standard clinical tests in, for example, known indications of active agent dosages giving equivalent blood levels of active agent; for example using dosages in the range of I mg to 1000 mg, e.g. Smg to 100mg, of active agent per day for a 75 kilogram adult and in standard animal models.
The increased bioavailability of the drug substance provided by the compositions can be observed in standard animal tests and in clinical trials.
The dosage form used, e.g. a tablet, may be coated, for example using an enteric coating.
Suitable coatings may comprise cellulose acetate phthalate;
hydroxypropylmethylcellulose TM
phthalate; a polymethyacrylic acid copolymer, e.g. Eudragit L, S; or hydroxypropylmethyl cellulose succinate.
The rapamycin used in the compositions of this invention, e.g. 40-0-(2-hydroxy)ethyl rapamycin or rapamycin, may be in crystalline or amorphous form prior to formation of the solid dispersion. An advantage, therefore, of this invention is that the rapamycin need not be crystalline. Thus the rapamycin may be used directly in combination, for example with a solvent, and does not have to be isolated in advance. Another advantage of the invention is that dissolution rates of the solid dispersion are higher than dissolution rates found for a crystalline rapamycin or an amorphous rapamycin in a simple mixture.
In another aspect, this invention provides a pharmaceutical composition in the form of a solid dispersion comprising an ascomycin and a carrier medium.
Examples of suitable ascomycins for use in the solid dispersion compositions of this invention include ascomycin or a derivative thereof, e.g. 33-epi-chloro-33-desoxy-ascomycin.
To date there is no conveniently administrable oral solid formulation available for 33-epi-chloro-33-desoxy-ascomycin. In another aspect, therefore, this invention provides a pharmaceutical composition in the form of a solid dispersion comprising 33-epi-chloro-33-desoxy-ascomycin and a Garner medium.
The compound 33-epi-chloro-33-desoxy-ascomycin is described in published European application EP 427 680 under Example 66a.
33-epi-chloro-33-desoxy-ascomycin will be referred to hereinafter as Compound Y.
The ascomycin, e.g. compound Y, compositions of this invention provide a high bioavailability of drug substance, are convenient to administer, and are stable.
The ascomycin, e.g. compound Y, may be present in the composition in an amount of about O.OI to about 30% w/w, and preferably in an amount of 1 to 20 % w/w.
The carrier medium may comprise any of the aforementioned components in amounts by wt-%
2 0 as described above. Suitable water-soluble polymers, cyclodextrins and other excipients, e.g.
surfactants, for use in the 33-epi-chloro-33-desoxy-ascomycin compositions of this invention are as described above.
In a preferred aspect, this invention provides a surfactant-containing composition comprising 2 5 an ascomycin, e.g. compound Y, in the form of a solid dispersion as described herein.
The weight ratio of the ascomycin, e.g. compound Y, to carrier medium is generally no more than I:3, preferably less than 1:4.
3 0 The ascomycin, e.g. compound Y, solid dispersion compositions may be prepared in analogous manner to the processes described above.

The oral compositions of compound Y disclosed herein are useful, for example, in the treatment of inflammatory and hyperproliferative skin diseases and of cutaneous manifestations of immunologically-mediated diseases. More specifically, the compositions of this invention are useful as antiinflammatory and as immunosuppressant and antiproliferative agents for use in the prevention and treatment of inflammatory conditions and of conditions requiring immunosuppression, such as a) the prevention and treatment of - rejection of organ or tissue transplantation, e.g. of heart, kidney, liver, bone marrow and skin, - graft-versus-host disease, such as following bone marrow grafts, - autoimmune diseases such as rheumatoid arthritis, systemic lupus erythematosus, Hashimoto's thyroidis, multiple sclerosis, Myasthenia gravis, diabetes type I
and uveitis, - cutaneous manifestations of immunologically-mediated illnesses;
b) the treatment of inflammatory and hyperproliferative skin diseases, such as psoriasis, atopical dermatitis, contact dermatitis and further eczematous dermatitises, seborrhoeic dermatitis, Lichen planus, Pemphigus, bullous Pemphigoid, Epidermolysis bullosa, urticaria, angioedemas, vasculitides, erythemas, cutaneous eosinophilias, Lupus 2 0 erythematosus and acne; and c) Alopecia areata.
Where the pharmaceutical composition of this invention is in unit dosage form, e.g. as a tablet, capsule or powder, each unit dosage will suitably contain between lmg and 100 mg of the drug 2 5 substance, more preferably between 10 and 50 mg; for example 15, 20, 25, or 50 mg. Such unit dosage forms are suitable for administration 1 to 5 times daily depending upon the particular purpose of therapy, the phase of therapy and the like.
In one embodiment of this invention, the composition comprises 30% by weight compound Y
3 0 and 70 % by weight HPMC in a dosage of e.g. 10 to SOmg per day for use in, e.g. psoriasis, atopical dermatitis or contact dermatitis.

~ CA 02225960 1997-12-30 The exact amount of the compositions to be administered depends on several factors, for example the desired duration of treatment and the rate of release of compound Y.
The utility of the pharmaceutical compositions containing compound Y can be observed in standard clinical tests in, for example, known indications of active agent dosages giving equivalent blood levels of active agent; for example using dosages in the range of 1 mg to 1000 mg of active agent per day for a 75 kilogram adult and in standard animal models. The increased bioavailability of the drug substance provided by the compositions can be observed in standard animal tests and in clinical trials.
Following is a description by way of example only of solid dispersion compositions of this invention.
Example 1 A solid dispersion composition is prepared containing the following ingredients (in parts by weight):
Compound X 9.1 HPMC 3 cps 81.8 2 0 Lactose 200 mesh 9.1 The composition (Form A) is prepared by dissolving the rapamycin and carrier medium in an ethanol/acetone miXture. Absolute ethanol is used in a 1:1 ratio by weight with the acetone.
The solvents are then evaporated, and the resulting dry residue milled to a fine powder with mean particle size < 0.5 mm.
Example 2 A solid dispersion composition is prepared containing the following ingredients (in parts by weight):
Compound X 16.7 3 0 HPMC 3 cps 66.7 Poloxamer 188 (from BASF) 16.7 ~ CA 02225960 1997-12-30 The composition (Form B) is prepared in analogous manner to that in Example 1.
Example 3 A solid dispersion composition is prepared containing the following ingredients (in parts by weight):
Compound X 16.7 HPMC 3 cps 66.7 TPGS * 16.7 The composition (Form C) is prepared in analogous manner to that in Example 1.
* tocopherol polyethylene glycol succinate Example 4 A solid dispersion composition is prepared containing the following ingredients (in parts by weight):
Compound X 10 HPMC 3 cps 80 Solulan C24 (from Amerchol) 10 The composition (Form D) is prepared in analogous manner to that in Example 1.
2 0 The above compositions Forms A to D may be formed into tablets, filled into capsules, or powdered and packaged in sachets.
Pharmacokinetics after administration of 40-0-l2-hvdroxvlethvl ranamvcin to rats a) Drug administration 2 5 0.5 ml aqueous dispersions of the Compound X compositions (corresponding to 4.0 mg active ingredient/rat) were administered by gastric intubation during a short inhalation anaesthesia with a 1 ml syringe, attached to a polyethylene tube. Six animals were used for each composition Forms A, B, C and D.
3 0 b) Blood sampling The animals received a permanent cannula into a vena jugularis one day prior to this experiment. 0.5 ml venous blood (vena jugularis) was collected from each rat and stored in 2.5 ml EDTA tubes. The blood samples of 2 animals (1 and 2, 3 and 4, 5 and 6) were pooled and stored at -80 °C until drug analysis. Samples were taken before administration and 10 minutes (m), 30m, 60m, 120m, 300m, 480m and 1440m after drug administration.
c) Bioanalytics The blood samples were analysed using reversed phase HPLC.
Table 1 shows the pharmacokinetic data collected after administration of Compound X to rats.
Table 1 Summary Profiles (averages of 2-3 pools) blood concentration (ng/ml) i time (h) Form A Form B Form C Form D

0.17 118 117 85 68 0.5 422 131 125 74 Cmax (ng/ml)573 135 131 81 Tmax (hr) 5.00 0.50 0.50 0.50 AUC 0-8h 3502 720 565 376 [(ng/ml).h]

AUC 0-24h 8213 1487 1192 886 L(n~~).h]

Form A resulted in blood levels higher than those after administration of surfactant-containing compositions.

Dog StudX
Following the above promising results, a relative bioavailability study was performed in fasted beagle dogs using a dose of 1 mg/kg body weight. Hard gelatin capsules each containing l Omg compound X were administered to 8 dogs in a 4-way Latin square design; the dogs were fed 6 hours post administration of the capsules, and blood levels of compound X were determined over 48 hours. Similar blood concentration profiles of compound X were observed for all the dogs, with a terminal halflife of compound X in blood between 10 and 40 hours.
Median peak levels of 140 ng/ml and median AUC levels of 0-48 hr ca. 1600 ng.h/ml were observed.
Example 5 A solid dispersion composition is prepared containing the following ingredients (in parts by weight):
Compound Y 20 HPMC 3 cps 80 The composition (Form E) is prepared by dissolving compound Y and carrier medium in an ethanol/acetone mixture. The solvents are then evaporated, and the resulting dry residue milled.
Example 6 A solid dispersion composition is prepared containing the following ingredients (in parts by weight):
2 0 Compound Y 20 HPMC 3 cps 70 Poloxamer 188 10 The composition (Form F) is prepared in analogous manner to that in Example 5.
Example 7 2 5 A solid dispersion composition is prepared containing the following ingredients (in parts by weight):
Compound Y 20 HPMC 3 cps 75 Sodium laurylsulfate 5 3 0 The composition (Form G) is prepared in analogous manner to that in Example 5.
The above compositions Forms E to G may be formed into tablets, filled into capsules, or powdered and packaged in sachets.
Pharmacokinetics after administration of 33-epi-chloro-33-desoxy-ascomycin to rats a) Drug administration 0.5 ml aqueous dispersions of the drug compositions (corresponding to 4.0 mg active ingredient/rat) were administered by gastric intubation during a short inhalation anaesthesia with a 1 ml syringe, attached to a polyethylene tube. Six animals were used for each composition Forms E, F, and G.
b) Blood sampling The animals received a permanent cannula into a vena jugularis one day prior to this experiment. 0.5 ml venous blood (vena jugularis) was collected from each rat and stored in 2.5 ml EDTA tubes. The blood samples of 2 animals ( 1 and 2, 3 and 4, 5 and 6) were pooled and stored at -80 °C until drug analysis. Samples were taken before administration and 10 minutes (m), 30m, 60m, 120m, 300m, 480m and 1440m after drug administration.
c) Bioanalytics The blood samples were analysed using reversed phase HPLC.
The results are plotted in Figures 1 and 2, in which ng/ml (vertical axis) is plotted against time in hours (horizontal axis). Figure 1 shows that Form F resulted in blood levels substantially 2 0 higher than blood levels observed after administration of Form E or Form G. Figure 2 shows that Form F resulted in high blood levels when administered with food.
Compound Y is in amorphous form in the compositions E, F and G on formation and after 6 months storage as determined by X-ray diffraction.
Forms E, F arid G are tested for respective dissolution rates. On stirring in a solution of 0.2 wt% sodium dodecylsulfate in water at 37°C, it is found that over 80%
available compound Y
is released and dissolved from each milled composition containing lOmg compound Y after 30 minutes. 92% available compound Y is released from Form E. This compares with 3 0 approximately 5% release after 30 minutes from an equivalent amount of crystalline compound Y.

Claims (8)

Claims
1. A pharmaceutical composition for oral administration in the form of a solid dispersion comprising a rapamycin or a rapamycin derivative and a carrier medium.
2. A composition as claimed in claim 1 wherein the carrier medium comprises a water-soluble polymer or a cyclodextrin.
3. A pharmaceutical composition as claimed in claim 1 wherein the rapamycin derivative is selected from 40-O-(2-hydroxy)ethyl rapamycin, 32-deoxorapamycin or 16-pent-2ynyloxy-32(S)-dihydrorapamycin.
4. A composition as claimed in claim 3 wherein the polymer is hydroxypropylmethylcellulose or polyvinylpyrrolidone.
5. A composition as claimed in claim 1 comprising up to 30% by weight of the rapamycin or the rapamycin derivative.
6. A composition as claimed in claim 2 wherein the water-soluble polymer is hydroxypropylmethylcellulose in an amount by weight of up to about 95 %.
7. A composition as claimed in claim 2 wherein the weight ratio of rapamycin or the rapamycin derivative to polymer is less than 1:4.
8. A composition as claimed in claim 1 which is surfactant-free.
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