I have Tummy Tuck surgery in 8 months. Can I have take Alli now to lose more weight?

Each surgeon has their own pre operative and post operative recommendations. You should address this question with your chosen surgeon. Regards, 

Thank you for your excellent question.  Though I can understand the desire to lose weight in order to maximize your surgical results it is best to follow a healthy diet and exercise regimen to do so.  Though Alli may help you lose weight, it would be important that the lifestyle modifications needed to stay at that weight are in place so that your achieved results remain long-term. Hope this helps.

Patients interested to loose weight after at tummy weight loss with over the counter medications (e.g. Alli, etc) should ask the plastic surgeon that performed the procedure if it is safe to do so. Significant fast weight loss could potentially affect the results of a tummy tummy. 

Ideally, you should be at your minimum weight prior to your surgery.  While it is best to get there using diet and exercise, over the counter medications to "help" shouldn't be a problem.  However, all medications and supplements, with some exceptions should be stopped prior to your surgery,.  8 month prior to your surgery shouldn't be a problem.  I would discuss all medications and supplements with your physician before proceeding, Best of luck.