An open-label, comparative study of rivastigmine, donepezil and galantamine in a real-world setting.

OBJECTIVE

We analysed the effects of donepezil, rivastigmine and galantamine, prescribed for the treatment of Alzheimer disease in a real-world setting in Italy.

METHODS

Outcome measures included the MiniMental State Examination (MMSE), the Alzheimer Disease Assessment Scale cognitive subscale (ADAS-cog), Instrumental Activity of Daily Living (IADL) and ADL scales.

RESULTS

Seventy patients were treated with donepezil, 121 with rivastigmine and 51 with galantamine. At 6 months, rivastigmine-treated patients improved by 1.29 points from baseline on the ADAS-cog, while donepezil- and galantamine-treated patients showed 'no change' (changes of < 0.2 points). On the IADL, patients treated with rivastigmine, donepezil and galantamine showed decreases of 0.42, 0.58 and 0.75 points, respectively. On the ADL, donepezil- and galantamine-treated patients showed decreases of 0.44 and 0.86 points, respectively, while there was 'no change' with rivastigmine. On the MMSE, donepezil- and rivastigmine-treated patients showed 'no change' and galantamine-treated patients showed a mean decrease of 1.19 points. A subgroup analysis of 'pseudo-randomised' patients (rivastigmine, n = 63; donepezil, n = 55; galantamine, n = 51) supported the main findings. Side effects were similar (in type and frequency) in the three treatment groups.

CONCLUSIONS

This is the first study to compare the effects of the three most commonly-used cholinesterase inhibitors on the MMSE, ADAS-cog, IADL and ADL. Limitations included its small population size, its open-label design, and the fact that patients were randomised only after the introduction of galantamine. There were no statistically significant differences between the three drugs at 3 months. While numerical trends were observed suggesting the effect of rivastigmine > donepezil > galantamine, larger, longer-term prospective studies are needed to confirm whether there are important differences in the long-term efficacy of the three drugs.