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Long-term donepezil treatment in 565 patients with Alzheimer's disease (AD2000): randomised double-blind trial.
Lancet 2004; 363(9427):2105-15Lct

Abstract

BACKGROUND

Cholinesterase inhibitors produce small improvements in cognitive and global assessments in Alzheimer's disease. We aimed to determine whether donepezil produces worthwhile improvements in disability, dependency, behavioural and psychological symptoms, carers' psychological wellbeing, or delay in institutionalisation. If so, which patients benefit, from what dose, and for how long?

METHODS

565 community-resident patients with mild to moderate Alzheimer's disease entered a 12-week run-in period in which they were randomly allocated donepezil (5 mg/day) or placebo. 486 who completed this period were rerandomised to either donepezil (5 or 10 mg/day) or placebo, with double-blind treatment continuing as long as judged appropriate. Primary endpoints were entry to institutional care and progression of disability, defined by loss of either two of four basic, or six of 11 instrumental, activities on the Bristol activities of daily living scale (BADLS). Outcome assessments were sought for all patients and analysed by logrank and multilevel models.

FINDINGS

Cognition averaged 0.8 MMSE (mini-mental state examination) points better (95% CI 0.5-1.2; p<0.0001) and functionality 1.0 BADLS points better (0.5-1.6; p<0.0001) with donepezil over the first 2 years. No significant benefits were seen with donepezil compared with placebo in institutionalisation (42% vs 44% at 3 years; p=0.4) or progression of disability (58% vs 59% at 3 years; p=0.4). The relative risk of entering institutional care in the donepezil group compared with placebo was 0.97 (95% CI 0.72-1.30; p=0.8); the relative risk of progression of disability or entering institutional care was 0.96 (95% CI 0.74-1.24; p=0.7). Similarly, no significant differences were seen between donepezil and placebo in behavioural and psychological symptoms, carer psychopathology, formal care costs, unpaid caregiver time, adverse events or deaths, or between 5 mg and 10 mg donepezil.

INTERPRETATION

Donepezil is not cost effective, with benefits below minimally relevant thresholds. More effective treatments than cholinesterase inhibitors are needed for Alzheimer's disease.

Authors+Show Affiliations

Trials Unit, University of Birmingham, Birmingham, UK.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Clinical Trial
Journal Article
Multicenter Study
Randomized Controlled Trial
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

15220031

Citation

Courtney, C, et al. "Long-term Donepezil Treatment in 565 Patients With Alzheimer's Disease (AD2000): Randomised Double-blind Trial." Lancet (London, England), vol. 363, no. 9427, 2004, pp. 2105-15.
Courtney C, Farrell D, Gray R, et al. Long-term donepezil treatment in 565 patients with Alzheimer's disease (AD2000): randomised double-blind trial. Lancet. 2004;363(9427):2105-15.
Courtney, C., Farrell, D., Gray, R., Hills, R., Lynch, L., Sellwood, E., ... Bentham, P. (2004). Long-term donepezil treatment in 565 patients with Alzheimer's disease (AD2000): randomised double-blind trial. Lancet (London, England), 363(9427), pp. 2105-15.
Courtney C, et al. Long-term Donepezil Treatment in 565 Patients With Alzheimer's Disease (AD2000): Randomised Double-blind Trial. Lancet. 2004 Jun 26;363(9427):2105-15. PubMed PMID: 15220031.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Long-term donepezil treatment in 565 patients with Alzheimer's disease (AD2000): randomised double-blind trial. AU - Courtney,C, AU - Farrell,D, AU - Gray,R, AU - Hills,R, AU - Lynch,L, AU - Sellwood,E, AU - Edwards,S, AU - Hardyman,W, AU - Raftery,J, AU - Crome,P, AU - Lendon,C, AU - Shaw,H, AU - Bentham,P, AU - ,, PY - 2004/6/29/pubmed PY - 2004/7/14/medline PY - 2004/6/29/entrez SP - 2105 EP - 15 JF - Lancet (London, England) JO - Lancet VL - 363 IS - 9427 N2 - BACKGROUND: Cholinesterase inhibitors produce small improvements in cognitive and global assessments in Alzheimer's disease. We aimed to determine whether donepezil produces worthwhile improvements in disability, dependency, behavioural and psychological symptoms, carers' psychological wellbeing, or delay in institutionalisation. If so, which patients benefit, from what dose, and for how long? METHODS: 565 community-resident patients with mild to moderate Alzheimer's disease entered a 12-week run-in period in which they were randomly allocated donepezil (5 mg/day) or placebo. 486 who completed this period were rerandomised to either donepezil (5 or 10 mg/day) or placebo, with double-blind treatment continuing as long as judged appropriate. Primary endpoints were entry to institutional care and progression of disability, defined by loss of either two of four basic, or six of 11 instrumental, activities on the Bristol activities of daily living scale (BADLS). Outcome assessments were sought for all patients and analysed by logrank and multilevel models. FINDINGS: Cognition averaged 0.8 MMSE (mini-mental state examination) points better (95% CI 0.5-1.2; p<0.0001) and functionality 1.0 BADLS points better (0.5-1.6; p<0.0001) with donepezil over the first 2 years. No significant benefits were seen with donepezil compared with placebo in institutionalisation (42% vs 44% at 3 years; p=0.4) or progression of disability (58% vs 59% at 3 years; p=0.4). The relative risk of entering institutional care in the donepezil group compared with placebo was 0.97 (95% CI 0.72-1.30; p=0.8); the relative risk of progression of disability or entering institutional care was 0.96 (95% CI 0.74-1.24; p=0.7). Similarly, no significant differences were seen between donepezil and placebo in behavioural and psychological symptoms, carer psychopathology, formal care costs, unpaid caregiver time, adverse events or deaths, or between 5 mg and 10 mg donepezil. INTERPRETATION: Donepezil is not cost effective, with benefits below minimally relevant thresholds. More effective treatments than cholinesterase inhibitors are needed for Alzheimer's disease. SN - 1474-547X UR - https://www.unboundmedicine.com/medline/citation/15220031/full_citation L2 - https://linkinghub.elsevier.com/retrieve/pii/S0140673604164994 DB - PRIME DP - Unbound Medicine ER -