What medicines,foods,should be avoided in patients with first degree av block? Medical mystery cardiologists and m.d. cannot find cause of first degree av block from boardeline to almost a second degree.Have flutters, low blood pressure most of time chest pain, sensitivity to almost any medicine antibiotics mainly, food sensitivities ugh collapsed while walking up hill had strep high blood pressure trouble breathing.everything “normal” now. Have first degree av block for 17 years has progressed some don’t know why.found out at 19 years old am now 36. Any thoughts?????