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.
Normally, sodium nitrate in vegetables does not pose the same health risk as nitrites found in processed meat. The nitrites added to processed meats as preservatives and color enhancers can combine with proteins called amines to form compounds called nitrosamines.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.