Compositions and methods for the treatment of nasal conditions
The invention provides compositions and methods for treating nasal congestion. The provided compositions and methods utilize low concentrations of selective α-2 adrenergic receptor agonists. The compositions preferably include brimonidine.
1 . A composition comprising a selective α-2 adrenergic receptor agonist having a binding affinity of 300 fold or greater for α-2 over α-1 adrenergic receptors, or a pharmaceutically acceptable salt thereof, wherein pH of said composition is between about 4.0 and about 8.5.
2 . The composition of claim 1 , wherein said selective α-2 adrenergic receptor agonist is selected from the group consisting of lofexidine, apraclonidine, mivazerol, clonidine, brimonidine, alpha methyl dopa, guanfacine, dexmedetomidine, (+)-(S)-4-[1-(2,3-dimethyl-phenyl)-ethyl]-1,3-dihydro-imidazole-2-thione, 1-[(imidazolidin-2-yl)imino]indazole, and mixtures of these compounds.
3 . The composition of claim 1 , wherein said α-2 adrenergic receptor agonist is present at a concentration from between about 0.001% to about 0.05% weight by volume.
4 . The composition of claim 1 , wherein said α-2 adrenergic receptor agonist is brimonidine at a concentration from between about 0.01% to about 0.025% weight by volume.
5 . The composition of claim 1 , further comprising from between about 0.1 to about 0.5% weight by volume of potassium chloride, and wherein said α-2 adrenergic receptor agonist is brimonidine, wherein said brimonidine concentration is from between about 0.01% to about 0.025% weight by volume, and wherein pH of said composition is between about 5.0 and about 8.0.
6 . A method of treating a nasal condition in a patient in need thereof comprising administering to said patient an pharmaceutically effective amount of the composition of claim 1 .
7 . The method of claim 6 , wherein said nasal condition is associated with severe nasal discharge with minimal turbinate swelling.
8 . The method of claim 7 , wherein said nasal condition comprises vasomotor rhinitis.
9 . The method of claim 6 , wherein said nasal condition is associated with substantial enlargement of nasal turbinates and/or physical blockage of nasal passages.
10 . The method claim 9 , wherein said nasal condition comprises a condition selected from the group consisting of allergic rhinitis, viral rhinitis, and sleep apnea.
11 . The method of claim 9 , wherein said selective α-2 adrenergic receptor agonist is brimonidine at sufficient lipophilicity to achieve substantial mucosal penetration and submucosal permeation.