Clonazepam vs. Quetiapine fumarate


We compare the side effects and drug effectiveness of Clonazepam and Quetiapine fumarate. The study is created by eHealthMe based on reports of 259,579 people who take Clonazepam and Quetiapine fumarate, and is updated regularly.

What's eHealthMe?

eHealthMe is a health data analysis company based in Mountain View, California. eHealthMe monitors and analyzes the outcomes of drugs and supplements that are currently on the market. The results are readily available to health care professionals and consumers.

eHealthMe has released original studies on market drugs and worked with leading universities and institutions such as IBM, London Health Science Centre, Mayo Clinic, Northwestern University and VA. eHealthMe studies have now been referenced in over 500 peer-reviewed medical publications.

How we gather our data?

Healthcare data is obtained from a number of sources including the Food and Drug Administration (FDA). This information is aggregated and used to produce personalized reports that patients can reference.

The information that eHealthMe collects includes:

  • Side effects (including severity and how people recover from them)
  • Associated conditions or symptoms
  • Drug effectiveness
  • Demographic data regarding drug use

How the study uses the data?

The study is based on clonazepam and quetiapine fumarate (the active ingredients of Clonazepam and Quetiapine fumarate, respectively). Other drugs that have the same active ingredients (e.g. generic drugs or brand names) are also considered.

What is Clonazepam?

Clonazepam has active ingredients of clonazepam. It is often used in stress and anxiety. (latest outcomes from Clonazepam 83,696 users)

What is Quetiapine fumarate?

Quetiapine fumarate has active ingredients of quetiapine fumarate. It is often used in bipolar disorder. (latest outcomes from Quetiapine fumarate 10,860 users)

How to use the study?

Patients can bring a copy of the report to their healthcare provider to ensure that all drug risks and benefits are fully discussed and understood. It is recommended that patients use the information presented as a part of a broader decision-making process.

On Feb, 21, 2019

259,579 people who take Clonazepam and Quetiapine fumarate are studied.

Number of reports submitted per year:

Clonazepam vs Quetiapine fumarate drug comparison reports.

Drugs in this study:

  • Clonazepam (clonazepam)
  • Quetiapine Fumarate (quetiapine fumarate)

Most common side effects:

  1. Diabetes Mellitus (diabetes, caused by a deficiency of the pancreatic hormone insulin)
  2. Weight Increased
  3. Type 2 Diabetes Mellitus
  4. Drug Ineffective
  5. Somnolence (a state of near-sleep, a strong desire for sleep)
  6. Completed Suicide (act of taking one's own life)
  7. Pancreatitis (inflammation of pancreas)
  8. Nausea (feeling of having an urge to vomit)
  9. Fatigue (feeling of tiredness)
  10. Malaise (a feeling of general discomfort or uneasiness)
Quetiapine Fumarate:
  1. Drug Ineffective
  2. Nausea (feeling of having an urge to vomit)
  3. Fatigue (feeling of tiredness)
  4. Headache (pain in head)
  5. Pain
  6. Dizziness
  7. Diarrhoea
  8. Fall
  9. Dyspnoea (difficult or laboured respiration)
  10. Vomiting

Most common side effects experienced by people in long term use:

  1. Diabetes Mellitus (diabetes, caused by a deficiency of the pancreatic hormone insulin)
  2. Type 2 Diabetes Mellitus
  3. Blood Cholesterol Increased
  4. Obesity (a medical condition in which excess body fat)
  5. Pancreatitis (inflammation of pancreas)
  6. Weight Increased
  7. Hyperlipidaemia (presence of excess lipids in the blood)
  8. Hyperglycaemia (high blood sugar)
  9. Diabetes Mellitus Inadequate Control
  10. Diabetic Ketoacidosis (diabetic ketoacidosis (dka) is high concentrations of ketone bodies)
Quetiapine Fumarate:
  1. Pain
  2. Headache (pain in head)
  3. Fatigue (feeling of tiredness)
  4. Nausea (feeling of having an urge to vomit)
  5. Dizziness
  6. Suicidal Ideation
  7. Drug Withdrawal Syndrome (interfere with normal social, occupational, or other functioning. are not due to another medical condition, drug use, or discontinuation)
  8. Suicide Attempt
  9. Emotional Distress
  10. Dyspnoea (difficult or laboured respiration)

Drug effectiveness:

  • not at all: 5.55 %
  • somewhat: 21.7 %
  • moderate: 31.28 %
  • high: 28.5 %
  • very high: 12.97 %
Quetiapine Fumarate:
  • not at all: 2.36 %
  • somewhat: 17.36 %
  • moderate: 33.54 %
  • high: 33.17 %
  • very high: 13.57 %

Do you take Clonazepam or Quetiapine fumarate?

You are not alone:

Related publications that referenced our studies

Related studies:

Compare Clonazepam with similar drugs
Compare Quetiapine fumarate with similar drugs

Recent updates

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WARNING: Please DO NOT STOP MEDICATIONS without first consulting a physician since doing so could be hazardous to your health.

DISCLAIMER: All material available on is for informational purposes only, and is not a substitute for medical advice, diagnosis, or treatment provided by a qualified healthcare provider. All information is observation-only, and has not been supported by scientific studies or clinical trials unless otherwise stated. Different individuals may respond to medication in different ways. Every effort has been made to ensure that all information is accurate, up-to-date, and complete, but no guarantee is made to that effect. The use of the eHealthMe site and its content is at your own risk.

You may report adverse side effects to the FDA at or 1-800-FDA-1088 (1-800-332-1088).

If you use this eHealthMe study on publication, please acknowledge it with a citation: study title, URL, accessed date.