Has more side effects than Allegra since it has pseudoephedrine in it. The antihistamine (fexofenadine) can cause dizziness, drowsiness, dry eyes/mouth, and constipation. The decongestant (pseudoephedrine) can make your blood pressure higher and can make it harder to sleep.
Food preservatives (or additives) contained in certain foods can trigger headaches. Nitrates and nitrites are additives in: 1  Hot dogs. 2  Ham. 3  Sausage. 4  Bacon. 5  Lunch meats and deli-style meats.6  Pepperoni.7  Other cured or processed meats. 8  Some heart medicines.ood preservatives (or additives) contained in certain foods can trigger headaches. Nitrates and nitrites are additives in: 1  Hot dogs. 2  Ham. 3  Sausage. 4  Bacon. 5  Lunch meats and deli-style meats. 6  Pepperoni. 7  Other cured or processed meats.
Root vegetables can contain high amounts of sodium nitrate. Many vegetables contain sodium nitrate, a small percentage of which converts to sodium nitrite after you eat it. Sodium nitrite can form nitrosamines, a potential cancer-causing agent, in the intestines.But vegetables also contain antioxidants that prevent the formation of nitrosaomines.itrosamines have shown cancer-causing potential in animal studies. Nitrates and nitrites themselves do not have cancer-causing potential. Vegetables contain ascorbic acid, a form of vitamin C and an antioxidant which helps prevent nitrosamine formation, although it might not completely prevent it.