Transdermal administration of memantine

Abstract

The invention relates to transdermal therapeutic systems (TTS) which include, as active ingredient, the NMDA receptor antagonist memantine or one of its physiologically compatible salts. The TTSs can be produced and used for treating diseases of the central nervous system.

That which is claimed: 
     
         1 . A transdermal therapeutic systems comprising memantine as an active ingredient, said memantine present as a free base or as a physiologically compatible salt or prodrug, said transdermal therapeutic systems comprising
 a backing layer impermeable to active ingredient;   at least one active-ingredient-containing layer comprising storage material comprised of a matrix-forming polymer in which the active ingredient is dissolved or distributed as a microdispersion therein;   a t max  of 30 h to 48 h;   and wherein either consecutive or staggered administration of one or more of the transdermal therapeutic system at a time for administration intervals each lasting at least 12 h to 168 h independently of one another, for achieving active ingredient concentrations in a blood plasma of an individual requiring treatment, achieves, in the blood plasma, active ingredient concentrations from a beginning of the administration of a first of one or more of said transdermal therapeutic system as follows:   after 24 h, at least 14 ng/ml to no more than 50 ng/ml,   after 48 h, at least 27 ng/ml to no more than 90 ng/ml,   after 60 h, at least 32 ng/ml to no more than 110 ng/ml,   after 72 h, at least 37 ng/ml to no more than 130 ng/ml,   after 96 h, at least 44 ng/ml to no more than 150 ng/ml,   after 144 h, at least 54 ng/ml to no more than 180 ng/ml,   after 192 h, at least 60 ng/ml to no more than 195 ng/ml,   after 240 h, at least 63 ng/ml to no more than 200 ng/ml, and   after 300 h, at least 65 ng/ml to no more than 210 ng/ml,   and said transdermal therapeutic systems have a memantine pharmacokinetic delay, t lag , of not more than 6 hours.   
     
     
         2 . The transdermal therapeutic system according to  claim 1 , wherein said matrix is adhesive. 
     
     
         3 . The transdermal therapeutic system according to  claim 1 , wherein the transdermal therapeutic system further comprises a stabilizer. 
     
     
         4 . The transdermal therapeutic system according to  claim 3 , wherein the stabilizer is a fabric or paper stabilizer. 
     
     
         5 . The transdermal therapeutic systems as claimed in  claim 1 , wherein each administration interval further comprising a duration of the administration interval in h and a number of simultaneously administered transdermal therapeutic systems whereby said duration in h divided by said number of the simultaneously administered transdermal therapeutic systems is in a range from 3 to 8. 
     
     
         6 . The transdermal therapeutic systems as claimed in  claim 1 , wherein the active ingredient concentrations are achieved upon administering one transdermal therapeutic system per administration interval or upon administering, simultaneously, multiple transdermal therapeutic systems per administration interval. 
     
     
         7 . The transdermal therapeutic systems as claimed in  claim 1 , wherein the active ingredient concentrations are achieved when each administration interval is not more than 72 h. 
     
     
         8 . The transdermal therapeutic systems as claimed in  claim 1 , wherein
 the active ingredient has a release rate of from 0.2 to 2.0 mg/h thereof averaged over the administration interval; and/or   the memantine pharmacokinetic delay t lag  is not more than 1.33±1.00 h.   
     
     
         9 . The transdermal therapeutic systems as claimed in  claim 1 , wherein the active-ingredient-containing layer (i) is pressure-sensitively adhesive and (ii) consists of a single polymer and the active-ingredient-containing layer additionally comprises at least one basic material and the transdermal therapeutic system does not comprise a separate adhesive layer. 
     
     
         10 . The transdermal therapeutic systems as claimed in  claim 1 , wherein the active-ingredient-containing layer comprises from 20 to 90% by weight of matrix-forming polymer, and from greater than 20% to 50% by weight of active ingredient, based on the active-ingredient-containing layer total weight. 
     
     
         11 . The transdermal therapeutic system as claimed in  claim 1 , wherein the storage material is arranged between the active-ingredient-impermeable backing layer and an active-ingredient-permeable membrane material. 
     
     
         12 . The transdermal therapeutic systems as claimed in  claim 1 , wherein said matrix-forming polymer within said active-ingredient-containing layer is acrylate thereby forming acrylate active-ingredient-containing layers and (i) said memantine is in a metering solution metered onto fabric; (ii) the transdermal therapeutic system comprises more than one active-ingredient containing layers or (iii) the transdermal therapeutic system comprises more than one active-ingredient-containing layer and a layer of fabric is present between the acrylate active-ingredient-containing layers for stabilization. 
     
     
         13 . The transdermal therapeutic systems as claimed in  claim 1 , wherein said transdermal therapeutic systems for administering memantine further comprises administering a daily dosage of memantine, administered in a first treatment week, a second treatment week, and a third treatment week, whereby administration during the first treatment week comprise 25% of the daily dosage; administration during the second treatment week comprise 50% of the daily dosage; and administration during the third treatment week comprise 75% of the daily dosage; and said transdermal therapeutic systems thereafter comprise 100% of the daily dosage. 
     
     
         14 . A method for treating or preventing a central nervous system disease comprising applying transdermal therapeutic systems as claimed in  claim 1  including memantine or a physiologically compatible salt or prodrug. 
     
     
         15 . The method as claimed in  claim 14 , wherein the central nervous system disease is selected from the group consisting of dementia, trauma, stroke, Parkinson's syndrome, Huntington's syndrome, epilepsy, drug addiction, depression, and anxiety states. 
     
     
         16 . A pack unit comprising transdermal therapeutic systems as claimed in  claim 1 , wherein said pack unit comprises at least two different transdermal therapeutic systems which differ in their releasable dosage, wherein a daily releasable maximum dose is achieved starting from a lower daily releasable initial dose that is increased stepwise over 2, 3 or 4 steps, with each step comprising single or multiple application intervals. 
     
     
         17 . A kit for treating or preventing central nervous system diseases comprising at least one nontransdermal dosage form wherein said nontransdermal dosage form is used to administer memantine or one of its physiologically compatible salts and at least one transdermal therapeutic system as claimed in  claim 1 .