My son tapered off far too quickly on gp's advice and had to go back up for a while.
He tried again, this time going much more slowly, even more slowly than the dr recommended.
I can't remember exactly how he did it, but IIRC, when he got down to 25mg (half a tablet) he then started missing one day in four, then one day in three, then taking on alternate days, then taking one day in three, one in four, one day in five... this was over several weeks. I don't remember how far he got before he stopped altogether, but when he did there were no side effects.
I want to say it took about three months?
So something like:
Days 1, 2, 3: 25mg
Day 4: nothing
Days 5, 6, 7: 25mg
Day 8: nothing
Days 9, 10, 11: 25mg
Day 12: nothing
Days 13, 14, 15: 25mg
Day 16: nothing
Days 17, 18: 25mg
Day 19: nothing
Days 20, 21: 25mg
Day 22: nothing
Days 23, 24: 25mg
Day 25: nothing
Days 26, 27: 25mg
Day 28: nothing
Day 29: 25mg
Day 30: nothing
Day 31: 25mg
Day 32: nothing
Day 33: 25mg
Day 34: nothing
Etc....
Day 40: 25mg
Days 41, 42: nothing
Day 43: 25mg
Days 44-45: nothing
Etc....
Day 50: 25mg
Days 51, 52, 53: nothing
Day 54: 25mg
Days 55, 56, 57: nothing
Etc, etc...