I doubt if any medication associated with an angiogram would be in the best interest of the patient or doctor. I understand your question is subsequent to the procedure, but if it occurs subsequent there could be a risk of having a coughing spell during the procedure. I have never heard the contrast dye or IV has caused a cough, but some individuals under specific circumstances could have the coughing episode as you describe.
Thanks for your question, maybe someone else has an answer or the experience.
Ken