Serious side effects Seroquel. Stop using Seroquel and call your doctor at once if you have a serious side effect such as:
- very stiff (rigid) muscles, high fever, sweating, confusion, fast or uneven heartbeats, tremors
- feeling like you might pass out
- jerky muscle movements you cannot control, trouble swallowing, problems with speech
- tremors, or restless muscle movements in your eyes, tongue, jaw, neck, arms, or legs
- mask-like appearance of the face, trouble swallowing, problems with speech
- blurred vision, eye pain, or seeing halos around lights
- increased thirst and urination, excessive hunger, fruity breath odor, weakness, nausea and vomiting
- fever, chills, body aches, flu symptoms, white patches or sores inside your mouth or on your lips