 [ Symptoms ] what are the side effects of weight loss pills [ Disease ] this question i have to tell you that is kind of one of those things that i guess asked all the time and i have to ask if they are taking the over the counter one which is alli or are they taking a prescription one some of the prescription ones work a little differently and it depends on the type of medication that they are on so as a pharmacist i am going to ask you to tell me which one you are on before i give you this type of information common side effects with some of the stimulant forms that are used to weight loss can include things like heart palpitations rises in blood pressure nausea dizziness constipation abdominal pain so you want to be really careful when patients are taking these to make sure they are not taking any other medications that they do not have any chronic conditions like high blood pressure or cardiovascular disease products like alli have more treatment effects which could include some fatty oils that will come out when they actually go in the bathroom they might experience some flatulence or gas we call them treatment effects but once again if they are just part of the medication doing its job it is actually helping you train to eat better and avoiding foods that are high in fat so just come and talk to me i will be more than happy to tell you what might happen to you if you have any additional questions we can always call your doctor and get you switched to something else