Tony starts with 50 pills and takes 2 pills each 3 times a day, meaning he takes 2*3=6 pills in total.
Tony repeats this process for two days in total, meaning over those two days he takes 2*6= <<2*6=12>>12 pills
Tony then cuts down his pill usage in half, meaning he's now taking 6/2= <<6/2=3>>3 pills a day.
Since he repeats this process for three days, that means he takes 3*3= <<3*3=9>>9 pills for that period.
Adding in the two pills Tony took on the final day, that means he took 12+9+2=<<12+9+2=23>>23 pills.
Since there were 50 pills in the bottle to begin with, this means Tony has 50-23=<<50-23=27>>27 pills remaining.
#### 27