I went to donate blood plasma last week, and during the medical exam I told them I was in pain management. I had to show them what medications I was on. Since I was on gabapentin, hydrocodone and flexiril I was told I would have to have my doctors consent to donate. My doctor filled out the necessary forms and cleared me to donate. The nurse and director of the center said even though the doctor had cleared me, they would not because of my hydrocodone use. When I asked for an explanation, I basically got a "because I said so" explanation. I would really like to know a medical explanation. Even the Mayo Clinic does not list hydrocodone as one of their "banned" medications for plasma donations.