Alzheimer's Disease Causes, Stages, and Symptoms (cont.)
Howard Crystal, MD
Melissa Conrad Stöppler, MD
Melissa Conrad Stöppler, MD
Melissa Conrad Stöppler, MD, is a U.S. board-certified Anatomic Pathologist with subspecialty training in the fields of Experimental and Molecular Pathology. Dr. Stöppler's educational background includes a BA with Highest Distinction from the University of Virginia and an MD from the University of North Carolina. She completed residency training in Anatomic Pathology at Georgetown University followed by subspecialty fellowship training in molecular diagnostics and experimental pathology.
In this Article
What treatment and management options are available for Alzheimer's disease patients?
The management of Alzheimer's disease consists of medication based and non-medication based treatments. Two different classes of pharmaceuticals are approved by the FDA for treating Alzheimer's disease: cholinesterase inhibitors and partial glutamate antagonists. Neither class of drugs has been proven to slow the rate of progression of Alzheimer's disease. Nonetheless, many clinical trials suggest that these medications are superior to placebos (sugar pills) in relieving some symptoms.
Alzheimer's disease medications
Cholinesterase inhibitors (ChEIs)
In patients with Alzheimer's disease there is a relative lack of a brain chemical neurotransmitter called acetylcholine. (Neurotransmitters are chemical messengers produced by nerves that the nerves use to communicate with each other in order to carry out their functions.) Substantial research has demonstrated that acetylcholine is important in the ability to form new memories. The cholinesterase inhibitors (ChEIs) block the breakdown of acetylcholine. As a result, more acetylcholine is available in the brain, and it may become easier to form new memories.
Four ChEIs have been approved by the FDA, but only donepezil hydrochloride (Aricept), rivastigmine (Exelon), and galantamine (Razadyne - previously called Reminyl) are used by most physicians because the fourth drug, tacrine (Cognex) has more undesirable side effects than the other three. Most experts in Alzheimer's disease do not believe there is an important difference in the effectiveness of these three drugs. Several studies suggest that the progression of symptoms of patients on these drugs seems to plateau for six to 12 months, but inevitably progression then begins again.
Of the three widely used ChEIs, rivastigmine and galantamine are only approved by the FDA for mild to moderate Alzheimer's disease, whereas donepezil is approved for mild, moderate, and severe Alzheimer's disease. It is not known whether rivastigmine and galantamine are also effective in severe Alzheimer's disease, although there does not appear to be any good reason why they shouldn't.
The principal side effects of ChEIs involve the gastrointestinal system and include nausea, vomiting, cramping, and diarrhea. Usually these side effects can be controlled with change in size or timing of the dose or administering the medications with a small amount of food. A majority of patients will tolerate therapeutic doses of ChEIs.
Partial glutamate antagonists
Glutamate is the major excitatory neurotransmitter in the brain. One theory suggests that too much glutamate may be bad for the brain and cause deterioration of nerve cells. Memantine (Namenda) works by partially decreasing the effect of glutamate to activate nerve cells. Studies have demonstrated that some patients on memantine can care for themselves better than patients on sugar pills (placebos). Memantine is approved for treatment of moderate and severe dementia, and studies did not show it was helpful in mild dementia. It is also possible to treat patients with both AchEs and memantine without loss of effectiveness of either medication or an increase in side effects.
Other medications for Alzheimer's disease
In 2014, Namzaric was FDA approved for use as a fixed-dose combination of memantine hydrochloride extended-release (an NMDA receptor antagonist) and donepezil hydrochloride (an acetylcholinesterase inhibitor) for treatment of moderate to severe Alzheimer's.
Memantine ER (extended release) is currently marketed under the name Namenda XR, and it is used to treat moderate to severe Alzheimer's.
Medically Reviewed by a Doctor on 8/13/2015
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