Two days ago, I went for my first Reclast infusion. The day after, I experienced fatigue, weakness, chills, headache, and nausea, but today I am feeling good and back to my old self! I also read in advance it is advisable to drink a ton of water the day before the infusion, the day of the infusion, and the day after the infusion, which I did. Also, it is important to get in your maximum calcium dose during these days.