Hi,
I've been on Alli for a few weeks and experienced constipation and bloating the first week.
On a Friday night I had to take a laxative because I was so unconfortable even though I was drinking lots of water.
I went back to check on what I'd been eating differently and noticed I had substituded a lot of crunchy healthy sweets for the soft and gooey baked goods I used to eat. I'd eat maybe 3 chocolate rice cakes a day and maybe some flatbread crackers when I'd never eaten these kinds of things in the past.
I replaced those crunchy foods with healthy fruity milkshakes, 1 cup fat free milk, 1 cup of fresh berries, 2 cups of ice, maybe a little splenda in a blender( you can also use low fat fruit juice and fruit). I havent had problems since, but if I do I'll take a laxative no more then once a week.
Also if you enjoy coffee that may help a bit too. I started back with 1 large cup a day. I bring my own evaporated milk (I love cream, this is my subtitute). Coffee can help the digestion.
Good Luck