Each medication has its own list of known side effects. A side effect can be defined as unwanted responses to a medication when it is taken in normal doses. They can range from mild or severe, temporary or permanent. The side effects listed below are not experienced by everyone who takes this Seroquel. Many of these side effects can be managed, while others may decrease over time. Common side effects include dizziness, lightheadedness, dry mouth,constipation, upset stomach, stomach pain, headache, tiredness, excessive weight gain, runny nose, rash, ear pain, flu symptoms, swollen ankles and blurred vision. More serious side effects include very stiff muscles, high fever, sweating, confusion, fast or uneven heartbeats, tremors, extreme fatigue, involuntary muscle movements, 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 or white patches or sores inside your mouth or on your lips. If you experience any of the above noted side effects, stop taking the medication and seek immediate medical attention. Immediately contact your doctor if you notice any of your symptoms worsen. Symptoms may include mood or behavior changes, panic attacks,anxiety, insomnia, irritability, hostility, aggressiveness, restlessness, hyperactivity, increased depression or thought of suicide. This is not a complete list of side effects. If you notice other effects not listed above, contact your doctor or pharmacist.