The doctor's office told me they want me to take this cocktail 1 hr before tumescent lipo, is this safe?

Everyone has their own protocols. If you have concerns, I recommend following up with your Doctor. For best results with liposuction, I recommend a hi definition procedure like VASER liposuction. I use VASER HI DEF with ThermiRF and fat grafting to get the most fat removal, skin tightening, contour and definition. This combination will give you the most toned result. I recommend getting a formal evaluation with a hi definition physique expert. Best, Dr. Emer

Dear eunit,every plastic surgeon has his own preoperative protocol which he recommends to his patients. I would suggest you to discuss this with your plastic surgeon.Daniel Barrett, MD
Certified, American Board of Plastic Surgery
Member, American Society of Plastic Surgery
Member, American Society of Aesthetic Plastic Surgery

Thank you for your question. It is not uncommon to give these meds if it is done under local. Most important is the dose. Please talk to your PS for clarification as everybody has their own protocol.

You do not mentionb your height and weight which has a lot to do with how safe some drugs might be for you. Also don't mention the dose of the lorazepam. If you are concerned or have questions, I would check with your physician who I presume is a board certified plastic surgeon.

It is hard to answer without knowing your body weight and the doses but I would say that if you are not confident in the medications or doses that a physician recommends then maybe you would be better off seeking another opinion. 
Liposuction can be performed under a local anesthetic but it is much more comfortable and can be more aggressive and thorough under a general anesthetic and it is very safe.
Sometimes patients think that a local is safer then a general, and in the strictest terms it is true, but when you are going to a facility that doesn’t have the equipment to adequately take care of your air way, or anesthesia personnel that manage patients, and you take a lot of sedation before hand then one must really ask if it is safer?

You have chosen a surgeon to take care of you. Now it seems you do not trust his advice. If that is the case you would be wise to see another physician that you trust.