I can only speak from experience with what I saw during the 2 months my boyfriend was on Alli.
#1. Please check with your doctor to see if this pill will interract with others. A pharmacist may not always be correct.
My boyfriend has a condition similar to bipolar disorder. He is on medication which the pharmacist said would not interfere with Alli. He was on Alli for 2 months. It was literally making his medications noneffective. He became a monster after about 2 weeks of taking and all the while I thought maybe he wasn't taking his meds.
We went to his psychiatrist and he noted Alli was very dangerous for anyone taking medications for mental or behavioral disorders.
He stopped taking Alli and shortly became himself. I'm not saying don't take it, I'm not knocking it. I just wanted to share what I witnessed.
Oh and he also had a very loose stomach while taking it...