My husband is 82 years old has Alzeheimers disease. He take Namenda, 10 mg, 2x a day; Aricept, 10mg, once daily. This along with blood pressure medicine and a baby aspirin. His phychiatrist recently put him on Risperidone, .025 mg, once daily and then changed it to 2x a day. Is this dangerous for him. Will it help?