The present invention relates to the use of inhibitors or blockers of Ih (hyperpolarization-activated cationic current) channels in the treatment of cognitive disorders. In preferred aspects of the present invention, an effective amount of a compound is administered to a patient in need, wherein the compound has the
chemical structure: Where R1 is H, or an optionally substituted C1-C3
alkyl, preferably a C2
alkyl (ethyl) group; R2 is an optionally substituted C1-C3
alkyl group, preferably a
methyl group; R3 is H, an optionally substituted C1-C3 alkyl (preferably methyl), a
halogen or 0(Ci-Ca) alkyl; R4 is an optionally substituted C1-C6 alkyl, C(O)—(C1-C5)alkyl, C(O)-
aryl, C(O)O—(C1-C4)alkyl, C(O)O-
aryl, or an optionally substituted heterocyclic,
aryl or heteroaryl group; R4 is H or an optionally substituted C1-C6 (preferably a C1-C3) alkyl; R5, R6 and R7 are each independently H,
halogen, an optionally substituted C1-C6 alkyl (preferably, an optionally substituted C1-C3 alkyl), 0-(C1-C3) alkyl, or an optionally substituted heterocyclic, aryl or heteroaryl group; Y− is an anion of a pharmaceutically acceptable salt (a physiologically acceptable anion, preferably a Cl−, Br−, I−, OAc−); or a solvate or polymorph thereof, optionally, in combination with guanfacine and / or
chelerythrine, and a pharmaceutically acceptable carrier, additive or
excipient to a patient in need of therapy.