Randomized, Double-blind Study to Evaluate the Tolerability of 2 Different Titration Methods of Rivastigmine Patch in AD Patients (MMSE 10-20)

Change From Baseline in the Alzheimer's Disease Assessment Scale - Japan Cognitive Subscale (ADAS-J Cog)

The Alzheimer's Disease Assessment Scale - Japan cognitive subscale (ADAS-J cog) was used to measure change in cognitive function. The ADAS-J cog score ranges from 0-70, with higher total scores indicating more impairment. A negative change score indicates improvement from baseline.

Time frame: Baseline, 8,16, and 24 weeks

Change From Baseline in Mini-Mental State Examination (MMSE)

The MMSE was used to measure severity of Alzheimer's disease. The test consists of 2 parts: language (time orientation, registration and attention) and performance (recall, response to written/verbal commands, sriting ability and reproduction of complex polygons); the total score can range from 0 to 30, with a higher score indicating better function. A positive change score indicates improvement from baseline.

Time frame: Baseline and 24 weeks

Number of Participants With Improvement in Japanese Clinical Global Impression of Change (J-CGIC). Patients With "Improvement": a Total of 1. Markedly Improved, 2. Improved, and 3. Slightly

The J-CGIC is simple 7 grade investigator's impression scale (1. Markedly improved, 2. Improved, 3. Slightly improved, 4. No change, 5. Slightly aggravated, 6. Aggravated, 7. Markedly aggravated) and a patient is defined to have improvement if J-CGIC tool the values 1, 2, or 3.

Time frame: 4, 8, 12,16, 20 and 24 weeks

The Percentage of Treatment Retention.

Treatment retention rate at effective dose is defined as the proportion of patients who met all the followings - 1) completed the study, 2) received rivastigmine patch 18 mg/day throughout the last 8 weeks 3) received 18 mg/day for ≥75% of the days during the last 8 weeks