[dennisw]

I took maybe 100 in one month. 4700 pills would mean he had to average 156 pills per day (30 day period)........

He might have been experimenting with different ones and flushed a lot down the toilet in fits of remorse and paranoia. He was trying to hide his pill habit from Marta

[Chancellor Palpatine]

He might have been experimenting with different ones and flushed a lot down the toilet in fits of remorse and paranoia. He was trying to hide his pill habit from Marta

That's pretty plausible.