I had my infusion at the cancer center of pamidronate last Friday, four days ago. When I pushed back the recliner as I watched the clear drip, drip, drip that is supposed to help strengthen my bones in preparation for my future craniocervical fusion, the burning taste of the chemical leached into the back of my mouth and throat. I know the sensation well, as I've felt it several times when being infused with contrast for an MRI or CT scan.
Today, I still have this taste all the way down my esophagus. A sort of slightly-burning presence and a bitter flavor that is not sensed by the taste buds in my mouth, but absorbed into my brain through the esophagus. In other words, I can't taste the chemical on my tongue or inside my mouth, but it's a taste that is powerfully present nonetheless. It creates an ever-present nausea, as well.
I just called the nurse and asked her, and she is going to question the doctor and get back to me. I imagine it is normal, but always think it's good to make sure.