Fluoxetine (Prozac) is an antidepressant medication used in the treatment of depression, obsessive-compulsive disorder, and other mental health conditions. Fluoxetine can be a safe and effective medication when used as prescribed. Taking too much fluoxetine can result in an overdose.
- Fluoxetine should be taken exactly as prescribed to reduce the risk of adverse effects and overdose.
- The symptoms of a fluoxetine overdose are often mild and transient and are rarely fatal. However, fatalities can occur, particularly among higher-risk individuals.
- Fluoxetine overdose symptoms can be managed with professional advice, supportive care, and monitoring.
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Can you overdose on fluoxetine (Prozac)?
Taking more fluoxetine than prescribed or combining it with other substances can lead to overdose.
Fluoxetine (Prozac) is an antidepressant medication classed as a selective serotonin reuptake inhibitor (SSRI). It is prescribed to treat various mental health conditions, including depression, panic disorder, obsessive-compulsive disorder (OCD), PMDD, and bulimia nervosa. [1]
SSRIs, such as fluoxetine, are the most commonly prescribed antidepressants as they have a safer side effect profile and lower risk of overdose than other antidepressants. However, it is possible to overdose on fluoxetine, although this is unlikely to be fatal. [2]
A typical daily dose of fluoxetine for an adult is 20 mg. Taking larger doses than this, or more frequent doses than prescribed, can result in an overdose. [1] Prozac overdoses are most severe in instances where other drugs or medications are involved, including alcohol or other antidepressants.
Symptoms of a Prozac overdose
Symptoms of a fluoxetine overdose are typically mild and short-lived, and often include: [1][3][4]
- Increased or irregular heartbeat
- Drowsiness
- Shaking
- Nausea or vomiting
Seek medical advice if these symptoms emerge.
Severe or emergency symptoms
In some cases, a fluoxetine overdose can cause severe symptoms, such as: [1][3]
- SeizuresÂ
- Loss of consciousness
- Very fast heartbeat
- Fever and sweating
- HallucinationsÂ
- Difficulty breathing
- Stopped breathing
- ArrhythmiaÂ
- Muscle stiffness
- Twitching, spasms, shaking, or other unusual movements that emerge suddenly and may be painful
- Extreme changes in mood or behavior, including manic or psychotic symptoms
In the event of any of these symptoms, call 911 immediately or attend the emergency department. Urgent medical attention may be required.
Prozac overdose vs. Common side effects
Side effects are common when commencing Prozac treatment or when the dose is increased. Typically, these will be alleviated within a few weeks and can include insomnia, nausea, dry mouth, tiredness, and shaking. [1][3]
However, severe side effects of Prozac can be similar to overdose symptoms, including signs of serotonin syndrome, trouble breathing, seizures, and loss of consciousness. [3]
If treatment has been ongoing for more than a few months, new symptoms may be a sign of fluoxetine overdose or issues with the safety and effectiveness of the treatment. If concerning symptoms emerge, it is best to consult a professional to determine the safety of the medication and whether intervention or treatment changes are required.Â
Is a Prozac overdose fatal?
In most cases, a Prozac overdose will not be fatal. Among all reported cases, a small number of fluoxetine-only overdoses have resulted in death, and most fatalities have involved polysubstance ingestion or underlying factors. Often, fluoxetine overdose will result in mild symptoms that will resolve quickly with minimal intervention. [1][4][5]
Factors that increase overdose risk
Taking a larger dose or more frequent doses than prescribed can lead to overdose. Reports of severe and fatal overdoses involve varying amounts, with some nonfatal cases involving larger doses than some fatal cases, highlighting the impact of individual differences in medication safety. [4][5]
Various factors can influence the risk and severity of overdose. For example:
- Using larger doses than prescribed in a short period.
- Using other drugs or alcohol alongside fluoxetine.
- Taking other medications that affect serotonin levels.
- Underlying health conditions, such as heart, respiratory, or seizure conditions.
- Age, as children and older adults, may be more vulnerable.
What to do if you think someone took too much Prozac
If a Prozac overdose is suspected, call Poison Control on 1-800-222-1222 or a medical professional for advice on managing the symptoms. If severe symptoms emerge or in case of an emergency, such as seizures, loss of consciousness, or breathing issues, call 911 or attend an emergency department immediately. [1][3]
If the information is available, report to the physician the time and amount of fluoxetine used, any other substances ingested and in what amounts, and information about the individual’s condition being treated, along with their prescribed dose.
Activated charcoal is likely to be administered, which helps to decontaminate the stomach and prevent further absorption of the medication. The individual will likely require monitoring and general supportive care, such as ensuring breathing and vital signs are within normal range, to ensure their symptoms are managed effectively and do not worsen. Further care is not typically required, and symptoms will generally resolve quickly. [1]
A mental health professional may review the individual to ascertain whether the overdose was intentional and the individual's risk of suicide. They may require inpatient mental health care or follow-up mental health treatment.Â
Preventing accidental overdose
To prevent accidental fluoxetine overdose: [1][6]
- Use the medication exactly as it has been prescribed. Never take a larger dose than prescribed or more frequently than prescribed. If a dose is missed and it is close to the next prescribed dosage time, skip the missed dose and take the next one at the correct time. Do not take a double dose.
- Use a pill box with allotted daily doses to avoid accidentally forgetting to take the medication or taking it more than once.
- Do not use fluoxetine with illicit substances or any other medications (unless directed by a clinician).Â
- Drinking alcohol while on fluoxetine is not recommended due to the increased risk of adverse effects, overdose, and worsening of mental health symptoms. However, those who wish to drink alcohol during treatment should avoid it at the start of a new or increased treatment, limit their intake, and be aware of the potential risks.
- Store fluoxetine in a safe place, where it cannot be accessed by children or others.Â
