Wednesday, 1 April 2015

Aricept

Aricept
Aricept(donepezil) was the second cholinesterase inhibitor approved by the FDA for the treatment of mild to moderate dementia of the Alzheimer\'s type.

Unlike the first generation cholinesterase inhibitor, Cognex, Aricept has a higher potency and lower incidence of peripheral adverse effect. 

In clinical studies, Aricept® has been demonstrated to improve memory, language and praxis (the performance of an action).  

Furthermore, Aricept® has not been associated with liver toxicity which was a major concern among physicians prescribing the first generation cholinesterase inhibitor.

Even though Aricept® has a convenient dosing schedule (the only once-daily chlolinesterase inhibitor) and better tolerability than other products such as Exelon®, it does not offer any significant additional clinical benefits compared with other cholinesterase inhibitors.

 All the existing cholinesterase inhibitor possess similar efficacy and none of them alter the long-term prognosis of Alzheimer\'s disease.  As a result, patients who have started taking Aricept® 2 to 4 years ago may experience reduced efficacy and may be required to switch to other drugs. 

In fact, a recent study demonstrated that 56of AD patients who have previously failed to benefit from Aricept, responded to Exelon®

Cognex

Cognex® 
Cognex® (tacrine) is the first reversible cholineseterase inhibitor drug approved for improving cognitive symptoms (i.e., memory, attention, reason, language, and the ability to perform simple tasks) associated with Alzheimer\'s disease.

The use of Cognex® has been limited by its liver toxicity and an inconvenient dosing schedule.  It has been reported that 50of patients taking Cognex® experienced liver toxicity.

 As a result, patients on Cognex® require periodic liver function tests to monitor their liver enzyme level.

Furthermore, Cognex® has a cumbersome dosing schedule.  While other cholinesterase inhibitors are required to be taken once or twice a daily, Cognex® has to be administered four times daily on an empty stomach.
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