What are the most common side effects of quetiapine?

Quetiapine, like any medication, can cause side effects. Here are some more detailed descriptions of the most common side effects of quetiapine:

  1. Drowsiness: Quetiapine can cause drowsiness, which may interfere with daily activities. This side effect is more common when starting the medication or when the dosage is increased, and may improve over time.
  2. Dizziness: Quetiapine can cause dizziness, especially when standing up quickly or changing positions. This side effect may also improve over time.
  3. Dry mouth: Quetiapine can cause a dry mouth, which may increase the risk of dental problems and infections. Drinking water and chewing gum may help to alleviate this side effect.
  4. Constipation: Quetiapine can cause constipation, which may be relieved by increasing fiber and fluid intake and exercising regularly.
  5. Weight gain: Quetiapine can cause weight gain, especially when taken for long periods of time. This side effect may be due to increased appetite and metabolic changes.
  6. Blurred vision: Quetiapine can cause blurred vision, which may be temporary or persistent. This side effect may be more common in older individuals or those with pre-existing eye conditions.
  7. Headache: Quetiapine can cause headaches, which may be mild or severe. This side effect may improve over time or with the use of over-the-counter pain relievers.
  8. Stomach upset: Quetiapine can cause stomach upset, including nausea, vomiting, and diarrhea. This side effect may be relieved by taking the medication with food or adjusting the dosage.
  9. Muscle stiffness: Quetiapine can cause muscle stiffness or rigidity, especially in the neck, shoulders, and back. This side effect may be more common in older individuals or those with pre-existing muscle or joint conditions.
  10. Tiredness: Quetiapine can cause tiredness or fatigue, which may interfere with daily activities. This side effect may improve over time or with adjustments to the dosage or timing of the medication.

It is important to discuss any side effects of quetiapine with a healthcare provider, who can help determine the most appropriate treatment plan based on individual needs and medical history.


There are various forms of drugs available, such as tablets or liquids, and each may have a separate patient information leaflet (PIL) for different doses. It is important to refer to the PIL for the specific form and dose of the drug that you have been prescribed.

You can search for further information and PILs on websites such as:

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What are the long term side effects of quetiapine?

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