Abstract: As disclosed herein, co-administration of pimavanserin with an agent that ameliorates one or more cholinergic abnormalities can have a synergistic effect on the efficacy of the agent. Disclosed herein are compositions which include pimavanserin in combination with an agent that ameliorates one or more cholinergic abnormalities. Also disclosed herein are methods for ameliorating or treating a disease condition characterized by one or more cholinergic abnormalities that can include administering pimavanserin in combination with an agent that ameliorates one or more cholinergic abnormalities.

Abstract: The invention relates to novel compounds of general formula (I), wherein R is a group of general formula (II) or (III), where X.sup.1 represents oxygen or sulphur and Y.sup.1 and Z.sup.1 both represent carbon, or X.sup.1 represents oxygen and one of Y.sup.1 and Z.sup.1 represents nitrogen and the other represents carbon, or X.sup.1 represents sulphur, Y.sup.1 represents nitrogen and Z.sup.1 represents carbon; one of X.sup.2, Y.sup.2 and Z.sup.2 represents oxygen or sulphur and the other two both represent carbon or one represents nitrogen and the other represents carbon, and the dotted line in formula (III) represents an optional additional carbon-carbon or carbon-nitrogen bond; A.sup.1, A.sup.2, A.sup.3 and A.sup.4 each represent carbon or, when one of X.sup.2, Y.sup.2 and Z.sup.2 represents oxygen or sulphur and the other two both represent carbon, one or two of A.sup.1, A.sup.2, A.sup.3 and A.sup.4 may represent nitrogen and the others carbon; and R.sup.1 to R.sup.5 are as defined in the description.