Before you receive a prescription for Glucagon, talk to your doctor about the following:, Your allergies, Your medications, Drug interactions can occur with certain medications, including beta blockers, indomethacin, anticholinergic drugs, warfarin, and insulin. Ask your doctor if you are unsure whether or not you take these medications., Your health problems, Your pregnancy or breastfeeding status, Low blood sugar may occur in patients with insulinoma. Oral or intravenous glucose may be necessary., Glucagon may cause severe allergic reactions. Seek emergency care immediately if you develop a rash, trouble breathing, low blood pressure, or swelling of your face, lips, tongue, or throat., Glucagon may not work as well in patients who do not have enough glycogen present in their liver. Patients who are in starvation, have adrenal insufficiency, or have chronic low blood sugar may not have enough glycogen. Glucose may be the treatment of choice in these patients., Continuous administration of glucagon may cause a skin rash called necrolytic migratory erythema. This condition goes away once glucagon is stopped., Glucagon as a diagnostic aid may cause high blood sugar in patients with diabetes., Glucagon as a diagnostic aid may cause high blood pressure and rapid heart rate in patients with heart disease., Secondary low blood sugar may occur in patients with glucagonoma who use glucagon. Your allergies, Your medications, Drug interactions can occur with certain medications, including beta blockers, indomethacin, anticholinergic drugs, warfarin, and insulin. Ask your doctor if you are unsure whether or not you take these medications., Your health problems, Your pregnancy or breastfeeding status Drug interactions can occur with certain medications, including beta blockers, indomethacin, anticholinergic drugs, warfarin, and insulin. Ask your doctor if you are unsure whether or not you take these medications.