(12) Patent Application Publication (10) Pub. No.: US 2009/0191271 A1 Brown Et Al
Total Page:16
File Type:pdf, Size:1020Kb
US 2009019 1271A1 (19) United States (12) Patent Application Publication (10) Pub. No.: US 2009/0191271 A1 BrOWn et al. (43) Pub. Date: Jul. 30, 2009 (54) TOPICAL FORMULATIONS (86). PCT No.: PCT/GB2O06/OO3408 (75) Inventors: Marc Barry Brown, Hertfordshire S371 (c)(1), (GB); Stuart Allen Jones, London (2), (4) Date: Jul. 16, 2008 (GB) (30) Foreign Application Priority Data Correspondence Address: Sep. 14, 2005 (GB) ................................... 0518769.5 GREENLEE WINNER AND SULLIVAN PC Publication Classification 4875 PEARL EAST CIRCLE, SUITE 200 (51) Int. Cl. BOULDER, CO 80301 (US) A6IR 9/14 (2006.01) A6II 47/32 (2006.01) (73) Assignee: Med Pharm Limited, Surry (52) U.S. Cl. ...................................... 424/487: 514/772.4 Research Park,Guildford (GB) (57) ABSTRACT Saturated, monophasic Solutions of drug in a solvent and (21) Appl. No.: 12/067,004 propellant mixture, together with a film-forming agent, exhibit transdermal diffusion fluxes greater than those pre (22) PCT Filed: Sep. 14, 2006 dicted by Fick's law when applied topically. Terrary Flot. Formulation 22 Soluble W Precipitated 2 s's 8 S. s 2. s 3:33s E.syster HF / Excipient%) Patent Application Publication Jul. 30, 2009 Sheet 1 of 14 US 2009/0191271 A1 10%PVP Soluble 6) Insoluble Patent Application Publication Jul. 30, 2009 Sheet 2 of 14 US 2009/0191271 A1 20%PWF Soluble 3. Insoluble 00%HFA sweetnews Patent Application Publication Jul. 30, 2009 Sheet 3 of 14 US 2009/0191271 A1 0% VP Soluble & Insoluble 0%BMW Fig.3 Patent Application Publication Jul. 30, 2009 Sheet 4 of 14 US 2009/0191271 A1 -a-30 SHOT, 10% EtOH BDP 4000 --20 SHOT, 10% EtOHBDP 3500 --o- 510 SHOT, SHOT, 10%. 10% EtOHBDP EtOHBDP 70 SO 50 - 4G 05 Shio 30 10%EtOHBDP at BOP Cream Patent Application Publication Jul. 30, 2009 Sheet 5 of 14 US 2009/0191271 A1 450,0 '' --ran 510 Shot shot 20%EtOH 10%EOH 350.0 30, 250.0 200,0 S.O. 10.0 SO, O 0.5 5 2 2.5 3 3.5 4. 45 Time (h) Fig.6 -- BMW Spray, 20 shots 3000 ... BMW Cream 200 O 50. O O.O 50.0 . O Time (h) Fig.7 Patent Application Publication Jul. 30, 2009 Sheet 6 of 14 US 2009/0191271 A1 O00 90.0 80.0 0.0 6.0 500 40,0 30, 2. O, -- BMW Spray, 5 shots -- BMW Mousse O.O O OS 5 2. 3. 3.5 4. 4.5 Time (h) Fig.8 9000 8000 win Saturated PEG 7000 essee 50:50 PWAFW 800,0 500,0 400,0 3000 2000 000 0.0 O O.S .5 2.5 3 3.5 4. 4.5 Time (h) Fig.9 Patent Application Publication Jul. 30, 2009 Sheet 7 of 14 US 2009/0191271 A1 4500 -- Saturated non 4000 Wolatile -- Subsaturated -A-Saturated volatile 30).O 2500 200.0 SOO. O.O 50.0 - O.O. were State EG . -- 0%. EtOH x40, No plastic or 59 FECSx30 . ruru iO% PEG, 40x St. 2X, X. Patent Application Publication Jul. 30, 2009 Sheet 8 of 14 US 2009/0191271 A1 Ternary Flot. Formulation 22 - Soluble W Precipitated g 3:33:3: s mes s es s i: is, Sis J. y re is girls; 8 fs ...Y as A 't s HFA e/ W. 7, *: Excipient%) 3 t 5 f 8 Patent Application Publication Jul. 30, 2009 Sheet 9 of 14 US 2009/0191271 A1 -0-0.013% BMW -- 0.500% BMW | *I 1.00% BMW --sat Etoh - 6O ( 0.013% BMW y: 60.095x + 4,6492 5 O r is 0.500% BMW R = 0.9967 4 O A 1.00% BMW it 42.199x 0.088 x Sat EtOH y Ro 800 3 O y is 23,874x + 11.291 2 O R = 0.6924 O y: 8,488x -3.1394 Rs 0.9979 O 0.2 0.4 0.6 0.8 Patent Application Publication Jul. 30, 2009 Sheet 10 of 14 US 2009/0191271 A1 Ternary Plot, F22 SA Fixed at 2%, Excipient = Copowidone S-630 19 Jul 06 HFA 5 O 15 2O 25 Excipient O Soluble o Precipiated Patent Application Publication Jul. 30, 2009 Sheet 11 of 14 US 2009/0191271 A1 35,0. -- Spray X 3O.O. E. Spray Y miro Spray Z 5s 250 mem. DiproSonew cream al g 8 20.0 - 92 555 15.0 s S. 10.0 - E 3 5.0 - t s 0.0 - 25- raw O 1 2 3 4. 5 Time (h) Patent Application Publication Jul. 30, 2009 Sheet 12 of 14 US 2009/0191271 A1 Ternary Plot, F22 90 HFA (%) Ethanol Fixed at 10%, 10 Excipient = PVP K90 O BPO (%) O O Soluble 5 O Excipientxcipient (%) O Precipiated Patent Application Publication Jul. 30, 2009 Sheet 13 of 14 US 2009/0191271 A1 5,00 4,50 4,00- y = -0.3056x + 3,4968 3,50 - R2 = 0.7195 3.00 - 2,50 - 200 150 100 - 0.50 O,OO . O 2 3 4 5 6 7 8 9 Distance (cm) Fig. 17 y = 0.3394x + 1.809 R = 0,5184 Number of Shots Fig. 18 Patent Application Publication Jul. 30, 2009 Sheet 14 of 14 US 2009/0191271 A1 30,00 . ... MDA -- BMM Gel 2 5. O O 20.00 15.00 10,00 5.00 0.00 immorowo rowroomoro-romaroorooo-oo-oor O 10 20 30 40 50 60 70 80 Time (h) Fig. 19 US 2009/019 1271 A1 Jul. 30, 2009 TOPCAL FORMULATIONS greatly to the epidermal permeability barrier, both to water and to other permeates (Ting et al., 2004). 0005. In order for therapeutic quantities of drug to pen 0001. The present invention relates to formulations for etrate the skin, the barrier properties of the Stratum corneum topical drug delivery, and methods for their use and manufac must be overcome. The Stratum corneum exhibits selective ture. permeability and allows only relatively lipophilic compounds 0002 The administration of therapeutic compounds either with a molecular weight below 400 Daltons to pass. However, locally to the skin, or into the systemic circulation after pas where a drug is very lipophilic, it may cross the Stratum sage through the skin, offers numerous potential advantages corneum, but diffusion is rapidly slowed as it enters the more over oral or parenteral drug delivery. These include the avoid aqueous lower regions of the epidermis in which it is poorly ance of hepatic first-pass metabolism, improved patient com soluble. Thus, as the diffusion of a very hydrophobic perme pliance and ease of access to the absorbing membrane, i.e. the ate proceeds into deeper layers of the skin, diffusion slows, skin. In addition, in the case of local delivery (i.e. delivery to and the concentration gradient (from Stratum corneum down the superficial layers of the skin) by directly administering the to the viable tissue) falls. The rate-determining step for spe drug to the pathological site, any adverse effects associated cies diffusing in this manner then becomes barrier clearance with systemic toxicity can be minimised. However, the effec not barrier penetration. tive delivery of drugs into and through the skin is not trivial. 0006. In addition to their inability to penetrate into the 0003 Molecules can pass into and/or through the skin via deep layers of the epidermis, poorly water soluble molecules passive diffusion. Passive diffusion can be described thermo are also notoriously difficult to formulate as they often exhibit dynamically by Fick's first law: low solubility in numerous topical vehicles. A sufficient con centration of a topically applied therapeutic agent must be loaded into the vehicle to ensure an adequate concentration KD(capp - erec) 1 gradient between the formulation and the skin, in order to attain adequate release of the drug into the skin. Topical formulations, such as ointments, which can solubilise high where (J) describes the steady state flux per unit area, (K) is concentrations of hydrophobic actives, are “heavy” and the partition of the drug between the skin and the formulation 'greasy', thus making them cosmetically unacceptable. and (D) is the diffusion coefficient through the diffusional However, the low solubility of hydrophobic compounds in path length (h). Since usually the concentration of the perme more cosmetically acceptable topical vehicles such as creams ate in the applied dose (c) is so much higher than the and gels often precludes their use. concentration in the receptor phase (c.) this equation can be 0007 Methods of overcoming the barrier properties of the simplified to: Stratum corneum may be divided into chemical. Such as the use of occlusion, penetration enhancers and Supersaturated J-keaf22 2 systems, and physical. Such as iontophoresis, skin electropo where k is the permeability coefficient and equal to KD/h ration, ultrasound and powder injection methods. For Small (Hadgraft, 2004). According to Fick's law the most important organic molecules, chemical enhancement methods have sev factors that influence flux across the skin are the concentra eral advantages, in terms of their low cost, lack of irritancy, tion gradient of the drug within the skin, the partition coeffi and simplicity, compared to physical methods. cient of the permeate and the diffusion coefficient (Thomas 0008 Irrespective of their mode of action, penetration and Finnin, 2004; Hadgraft, 2004). In addition, the flux (J) of enhancers usually alter the barrier properties of the skin. a molecule across a membrane should increase linearly with Whether the structural alteration is reversible or not, the con concentration until c. reaches the solubility limit i.e. at the centrations of penetration enhancers required to elicit an effi point of Saturation (i.e.