Some evidence indicates other drugs such as amantadine and anticholinergics may be useful as treatment of motor symptoms in early and late PD, but since the quality of evidence on efficacy is reduced, they are not first-choice treatments. In addition to motor symptoms, PD is accompanied by a range of different symptoms. Different compounds are used to improve some of these problems. Examples are the use of clozapine for psychosis, cholinesterase inhibitors for dementia, modafinil for day somnolence, and atomoxetine for executive dysfunction.