Increased Risk in Older Adults With Dementia-Related Psychosis
Seroquel XR is not approved for the treatment of dementia-related psychosis.
Older adults with dementia-related psychosis who are treated with antipsychotic medications may have an increased risk of death. There may also be an increased risk of stroke or other serious cardiovascular events in this population.
Suicidal Thoughts and Behaviors
Seroquel XR may increase the risk of suicidal thoughts and behaviors, especially in children, adolescents, and young adults being treated for depression or other psychiatric conditions.
Patients should be monitored closely, particularly when treatment is started or when the dose is changed.
Contact a healthcare provider promptly if you notice new or worsening depression, unusual changes in mood or behavior, or thoughts of self-harm.
Low Blood Pressure and Dizziness
Seroquel XR can cause orthostatic hypotension, which is a drop in blood pressure when standing up.
This may cause:
- Dizziness
- Lightheadedness
- Fainting
- Increased risk of falls
These effects are more likely when treatment is first started or when the dose is increased.
Stand up slowly from sitting or lying down, especially if you feel dizzy.
Seizures
Seroquel XR may lower the seizure threshold in some people.
Tell your healthcare provider if you have a history of seizures or other conditions that may increase your seizure risk.
Drowsiness and Impaired Thinking
Seroquel XR can cause drowsiness, dizziness, slowed thinking, and problems with coordination.
Until you know how the medication affects you, avoid driving, operating machinery, or doing other activities that require full alertness.
Alcohol can make these effects worse and should generally be avoided or limited as directed by your healthcare provider.
High Blood Sugar and Diabetes
Seroquel XR can increase blood sugar levels.
This may lead to hyperglycemia and, in some cases, diabetes.
The risk may be higher if you already have diabetes or have other risk factors for diabetes.
Contact your healthcare provider if you develop symptoms such as:
- Increased thirst
- Frequent urination
- Unusual hunger
- Weakness or fatigue
Your healthcare provider may monitor your blood glucose during treatment.
Weight Gain and Cholesterol Changes
Seroquel XR may cause weight gain and changes in cholesterol or triglyceride levels.
Your healthcare provider may monitor:
- Body weight
- Blood sugar
- Cholesterol
- Triglycerides
Regular monitoring is especially important during long-term treatment.
Neuroleptic Malignant Syndrome
Seroquel XR can rarely cause neuroleptic malignant syndrome (NMS), a serious and potentially life-threatening reaction.
Seek immediate medical attention if you develop:
- High fever
- Severe muscle stiffness
- Confusion
- Heavy sweating
- Changes in heart rate or blood pressure
NMS requires urgent medical treatment.
Tardive Dyskinesia
Long-term use of antipsychotic medications may cause tardive dyskinesia, a movement disorder that can sometimes be permanent.
Symptoms may include repetitive or uncontrollable movements of the:
- Face
- Tongue
- Mouth
- Arms
- Legs
Tell your healthcare provider if you notice any new or unusual movements.
Drug Interactions
Seroquel XR can interact with other medications and substances.
Some medicines may increase quetiapine levels and raise the risk of side effects, while others may reduce its effectiveness.
Important interactions may occur with:
- Certain antibiotics
- Antifungal medications
- Seizure medications
- Sedatives or sleeping medications
- Blood pressure medications
- Other medications that affect heart rhythm
- Alcohol
Tell your healthcare provider about all prescription medications, over-the-counter products, vitamins, supplements, and herbal products you use.
Heart Rhythm Changes
Seroquel XR can affect the electrical activity of the heart and may increase the risk of an abnormal heart rhythm in some people.
The risk may be higher if you have heart disease, low potassium or magnesium levels, or take other medications that affect heart rhythm.
Tell your healthcare provider if you have a history of heart problems or fainting.
Increased Risk of Falls
Drowsiness, dizziness, low blood pressure, and problems with coordination can increase the risk of falls.
This may be especially important in older adults.
Use caution when standing, walking, or changing position until you know how Seroquel XR affects you.
Do Not Stop Suddenly
Do not stop taking Seroquel XR suddenly unless your healthcare provider tells you to.
Stopping too quickly can cause withdrawal symptoms such as nausea, headache, diarrhea, dizziness, irritability, and trouble sleeping.
Your healthcare provider may recommend gradually reducing the dose when treatment is discontinued.
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