There's a reasonable chance the Diovan did cause the anaphylactic reaction. I would definitely not take it again before discussing this with an MD. While this sort of reaction is rare, there is a slightly greater statistical chance of it happening with an ACE inhibitor, and if it's being used only for blood pressure control there are certainly plenty of alternatives. Calcium channel blockers are less likely to cause this sort of reaction (and of course it may not have been the Diovan either, but you don't take it on a regular basis anyway). There are also beta blockers, athough if you're going to take the drug on an off-and-on basis this wouldn't be a great choice, because when it's stopped there is often a rebound effect and it needs to be tapered to avoid this. There are several other families of drugs that might work well that could be tried, and if you weren't feeling well anyway with the Diovan then you may just as well look for something more agreeable, especially after this episode.
Talk to your doctor about a change. ACE inhibitors are generally very good for BP control as well as post-coronary care, but they do have some potential odd side effects (a dry, tickling cough is another one seen frequently). I hope this is helpful. Good luck to you. Please follow up with us as needed.
John Kenyon, EMT, CCT
Non-invasive cardiology tech, Emergency and Critical Care technician, Critical Incident Stress Mgmt. specialist