For ten days before I took calcium 600mg twice a day, and I always take vitamin D. I also increased water a few days before, but day before I drank at least 64 ounces. Day of reclast infusion I drank 32 ounces before going in and took tylenol. I did not need tylenol afterwards, but tried to drink more water for the first five days and continued calcium and vitamin D. They did the reclast infusion for 15 minutes and then watched me for 30 minutes. I asked about the 15 minutes but they said that is what the manufacturer recommended and they always do it that way. Concerned me, but it was all good.