Some clinics claim its no big deal, some give meds, some put you under (seems extreme). Ibuprofin will in no way alter the results, so definitely take 800 -1000 mg (3-4 200 dose pills) an hour before. It really helped me.
It seems crazy to me they would not recommend it. It's easy enough to take. Just don't have any wine or alcohol for 24 hours, that's a lot of ibuprofin for the liver to process.