Like any other medication Veramyst also has its fair share of side effects, therefore make sure to go to your doctor if you have any signs of an allergic reaction to the medication. Some side effects include: Nosebleeds, Sores in the nose, A constant whistling sound from the nose, Facial pain, Eye pain, White patches on your nose and at the back of your throat, A persistent sore throat, Difficulty in swallowing, Fatigue, Weight loss, Headaches, Swelling of feet and ankles, Increased thirst, Increased urination, Vision problems, Allergic reaction, Rashes, Swelling of face, tongue, and throat, Severe dizziness, Troubled breathing The list mentioned above does not mention all of the possible side defects that one is likely to experience.