Diagnosed with probable AD according to NINCDS-ADRDA criteria,
MMSE score of 10 to 24,
Receiving the same AChEI or Memantine for the past 6 months prior to screening and on a stable dose for the past 4 months (stable dose is defined as 5 to 10mg/day for Donepezil, 3, 4.5 or 6 mg twice daily for rivastigmine capsules, 4.6 or 9.5 mg for rivastigmine transdermal patch once daily, 8 or 12 mg twice daily for galantamine tablets, 16 to 24 mg once daily for galantamine capsules XL, 10 mg OD or 10 mg BD for Memantine)
Patient or legal representative is able to provide informed consent
You may not be if
Patients receiving any investigational product within 60 days or 5 half-lives prior to screening
Any serious medical or psychiatric condition which in the investigator's judgement may jeopardize the patient by his/her participation in this study or may hamper his/her ability to perform and complete procedures required in the study.