Common side effects may include a runny nose, sore throat, back pain, sinus pain, and diarrhea. Serious side effects may include: Eye pain, Vision problems, Feeling light-headed, Fainting, Swelling, Rapid weight gain, Fast or pounding heartbeats, Urinating less than usual or not at all, Jaundice (yellowing of the skin or eyes), Dry mouth, Increased thirst, Drowsiness, Restless feeling,, Confusion, Increased urination, Fast heart rate, Fainting, Seizure (convulsions) If any of the side effects persist or worsen, seek immediate medical help.