Patients with Parkinson's disease (PD) may be able to continue taking their medications without risking cognitive decline, new evidence suggests. In spite of recent concerns, a new study found that PD patients taking anticholinergic medications were not at an increased risk of developing dementia. Previous studies have suggested a greater risk of dementia, in particular Alzheimer's disease (AD), among patients who use anticholinergics regularly. Anticholinergics are a class of medications commonly used to treat diseases like PD, asthma, bladder dysfunction, chronic obstructive pulmonary disease (COPD). These drugs help block the involuntary muscle spasms caused by these conditions. They are also prescribed for some mood and sleep disorders.