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Prozac is the commercial name for the active ingredient fluoxetine, which belongs to the class of antidepressant medications known as selective serotonin reuptake inhibitors (SSRIs). This drug has been widely accepted and used for the treatment of various mental health disorders, such as depression, anxiety disorders, obsessive-compulsive disorder (OCD), and panic disorder.

Also called:

Fluoxetine Sarafem Prozac Weekly Rapiflux Selfemra Oxactin Fontex Lovan Fludac Prodep Prozep Zactin Serta
How the drug works varies from person to person

How you might feel

People taking Prozac often report an improvement in their mood over time. However, in the initial stages, they might experience heightened anxiety or irritability. Some users also mention feeling emotionally “numb” or detached. It generally takes a few weeks for the full effects to kick in. Patience is often required as the medication takes time to adjust serotonin levels in the brain.

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Effects on your body

Common physical side effects include nausea, dizziness, dry mouth, and sleep disturbances like insomnia. These effects are generally mild and often subside after the first few weeks of treatment. However, if they persist or worsen, it’s important to consult a healthcare provider.

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How long it takes to work

Prozac typically takes several weeks to show its full effects. Some people may start to notice an improvement in symptoms like mood and energy levels after 1–2 weeks, but it may take up to 4–6 weeks for the medication to exert its full effects.

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How long the effects last

The effects of Prozac can last for a variable period, depending on individual factors like metabolism and the specific condition being treated. For some people, it may be necessary to take the medication long-term to manage symptoms effectively.

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Common risks

Some of the risks associated with taking Prozac include serotonin syndrome when combined with other medications affecting serotonin levels, and an initial increase in anxiety or suicidal thoughts. People with certain preexisting conditions like liver disease may need regular monitoring.

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Prozac is the commercial name for the active ingredient fluoxetine, which belongs to the class of antidepressant medications known as selective serotonin reuptake inhibitors (SSRIs). This drug has been widely accepted and used for the treatment of various mental health disorders, such as depression, anxiety disorders, obsessive-compulsive disorder (OCD), and panic disorder.1 Fluoxetine’s primary function lies in increasing the serotonin levels in the brain, a neurotransmitter associated with mood regulation.4 Fluoxetine alters the balance of serotonin by inhibiting its reuptake, making more of this chemical available in the synapses between neurons. It’s also prescribed to treat bulimia nervosa and premenstrual dysphoric disorder (PMDD).3 The drug comes in various forms, including tablets, capsules, and liquid, and is available only on prescription.

The development of fluoxetine marked a significant turning point in psychiatric medication history. Eli Lilly and Company were the original developers, and when Prozac was introduced, it represented a leap in the medical treatment of depression. Before Prozac, the primary treatments for depression were tricyclic antidepressants and MAOIs, which often came with a series of undesirable side effects.1 Prozac’s discovery revolutionised the mental healthcare landscape, as it generally had fewer side effects and was better tolerated by a wider range of patients.

During the late 1980s and 1990s, Prozac received considerable media attention, often being referred to as the “happy pill” for its purported ability to improve mood.5 Prozac became one of the most prescribed medications in the United States, generating significant profits for Eli Lilly.1 It was also among the first SSRIs to become available as a generic medication, making it more accessible to a broader population.

Prozac is lauded for its efficacy in improving mood, increasing energy levels, and promoting better sleep, thereby contributing to the betterment of life quality in those who suffer from various mental health conditions. The drug affects the balance of neurotransmitters in the brain, specifically serotonin, which plays a vital role in mood, emotion, and sleep.2

However, Prozac also has a range of side effects that can vary in intensity. Common side effects include nausea, headache, drowsiness, and sexual dysfunction.6 In rare cases, Prozac has been associated with increased suicidal thoughts, especially in younger adults and teenagers. 7 Despite these risks, it’s important to note that Prozac is generally not considered addictive.8 Although not addictive, sudden discontinuation of the medication can result in withdrawal symptoms like irritability and dizziness, which is why tapering off under medical supervision is advised.

How it looks, tastes and smells


Prozac usually comes in capsule form, although it is also available as a liquid and tablet. The capsules are often green and white and contain a white powder.9 The liquid form is clear and colourless. If you are prescribed tablets, these are generally round and white.3 Always note that the appearance may vary depending on the manufacturer.


The taste of Prozac is not typically described in medical literature, but it’s worth noting that the capsules are designed to be swallowed whole and not broken, chewed, or crushed.3 Therefore, the taste is generally not experienced. The liquid is usually flavoured to mask the medicinal taste, often described as mint-flavoured.


Information on how Prozac smells is not commonly provided in medical literature or from the sources you’ve provided. Medications like Prozac are generally sealed in airtight packaging to maintain efficacy and prevent contamination. Therefore, any smell it might have is usually not perceptible unless the medication has gone bad, in which case it should not be consumed.3


Prozac is primarily available in capsule form, which is meant for oral administration. Some people are also prescribed the medication in tablet form or as a liquid.9

Generally, the capsules are swallowed whole with water and are not meant to be broken, chewed, or crushed. It is usually recommended to take Prozac at the same time every day to maintain a consistent level of the drug in the bloodstream. It can be taken with or without food, but taking it with food may help to mitigate some gastrointestinal side effects like nausea.3 The liquid form of Prozac should be measured carefully using a dosing syringe or other accurate measurement device. Your healthcare provider may also adjust the dose over time, depending on the response to the treatment and the nature of the condition being treated.

It is crucial to follow the guidelines healthcare professionals provide to get the most benefit from the medication while minimising potential risks.

  • Minimum to Feel Something (mg): The minimum effective dose for Prozac often varies based on the condition being treated. For adults with depression or OCD, treatment often starts at a dosage of 20 mg per day. 9 Initial doses for children and adolescents are generally lower.
  • Low Dose: A low dose for treating depression in adults usually starts at 20 mg per day but may be lower for children or individuals being treated for other conditions.
  • Common Dose: The most common dose for treating conditions like depression and OCD in adults is usually around 20-60 mg per day.3 Again, these dosages can be different depending on the individual and the condition being treated.
  • High Dose: A high dose of Prozac would generally be above 60 mg per day, but this level is typically only reached under close medical supervision. It is crucial to remember that exceeding the recommended dose can result in severe side effects and could be dangerous.3

Notes on What May Happen When Exceeding the High Dose

Exceeding the high dose of Prozac can lead to severe consequences, including an increased risk of overdose. Overdose symptoms can vary but commonly include nausea, vomiting, and seizures. An increased heart rate is also commonly reported, and the individual may suffer from irregular heartbeats in severe instances.9 High doses can also induce serotonin syndrome, a life-threatening condition that requires immediate medical intervention.

Symptoms of serotonin syndrome include agitation, confusion, rapid heart rate, and high fever. 3 In extreme cases, overdose can lead to coma or death if not treated immediately. It is important to always adhere to the dosage prescribed by a healthcare provider and consult them if you experience any unusual symptoms. Exceeding the prescribed dosage also has the potential to exacerbate side effects, including gastrointestinal issues and sleep disturbances. If an overdose is suspected, immediate medical attention is necessary.

How you might feel

After the initial period when the drug is getting into the system, most users report an improvement in mood, increased energy levels, and a decrease in symptoms such as anxiety and sadness. It often helps people to engage better with daily activities and improves overall well-being.3 However, some users have reported side effects, including nausea, a decrease in sexual drive, and sometimes headaches.6 Importantly, these effects can vary from person to person, and some may experience side effects that others do not. As the medication alters brain chemistry, some users have reported feeling emotionally ‘numb’ or said that they don’t feel like ‘themselves’. It is important to discuss any changes in emotional or physical well-being with healthcare providers.

How long it takes to work

Prozac is not an immediate relief medication; it usually takes about 4 to 6 weeks for the drug’s full effects to become apparent. Some individuals may experience a slight improvement in their symptoms within the first week or two, but this is not the full extent of the drug’s efficacy.3 The delayed onset means patients must exercise patience and continue their prescribed regimen, even if immediate results are not apparent. This aspect can be particularly challenging for individuals suffering from depression or anxiety, as they may be eager for fast relief. Consequently, healthcare providers usually emphasize the importance of compliance and setting realistic expectations for the treatment period. It is crucial to consult the healthcare provider about any concerns about the onset of the drug’s effects.

How long the effects last

The half-life of Prozac is about 4 to 6 days, meaning it takes about this long for half of the drug to be eliminated from the body.2 The long half-life contributes to a steady-state level of the drug in the body, which helps to maintain its effects over time. However, this also means it takes a similar amount of time to clear from the system, so healthcare providers usually recommend a gradual tapering off of the medication rather than abrupt cessation.3 The effects of the drug can last for a variable period depending on the individual’s metabolism, other medications they may be taking, and their overall health. It’s crucial to follow healthcare advice regarding the duration of treatment, which can vary depending on the medical condition being treated.

Common risks

While Prozac is generally considered safe when taken as prescribed, it comes with its own set of risks. Common side effects include nausea, sleep disturbances, and dizziness. However, some risks are more severe, such as the increased risk of suicidal thoughts, particularly among younger users.7 Another severe risk is serotonin syndrome, a potentially life-threatening condition if not treated promptly.3 High doses can lead to this syndrome, marked by symptoms such as agitation, hallucinations, and rapid heart rate. It is also important to note that Prozac can interact with other medications, which can either enhance or diminish its effects or lead to other health complications.


Certainly, Prozac, which contains the active ingredient fluoxetine, is generally not considered to be addictive. Unlike substances such as opioids or benzodiazepines, which have a high potential for abuse and dependency, Prozac doesn’t produce the ‘high’ that is often associated with addictive substances.8 However, it’s crucial to point out that stopping Prozac suddenly can lead to withdrawal symptoms, which are sometimes misunderstood as signs of addiction. These symptoms may include irritability, nausea, dizziness, and a sensation of electric shocks, commonly referred to as “brain zaps”.7

It’s important to distinguish between physical dependence and addiction. Physical dependence can occur with many medications and means that the body has adapted to the drug’s presence. It doesn’t necessarily mean the person is addicted, which involves compulsive drug use despite harmful consequences. With Prozac, physical dependence is not usually a concern, but abrupt discontinuation can lead to uncomfortable symptoms.3 For this reason, medical professionals usually recommend tapering off the medication gradually under supervision.

Withdrawal symptoms are generally not life-threatening but can be quite uncomfortable. These symptoms are a part of what is sometimes referred to as “antidepressant discontinuation syndrome” and can be mistaken for a relapse into depression or another mental health condition for which Prozac was prescribed. To manage this, healthcare providers often create a tapering schedule to help patients gradually decrease their dosage to minimise withdrawal symptoms.

There is also another dimension to consider. Some users have reported feeling emotionally “numb” while on Prozac, and this effect can sometimes lead to concerns about dependency, as people might feel unable to function emotionally without the medication.3 However, this is a topic of ongoing research and debate within the medical community.

In summary, while Prozac is not considered addictive in the conventional sense, it’s essential to follow the healthcare provider’s guidelines for starting or stopping the medication to avoid potential withdrawal symptoms. It’s also crucial to engage in open communication with healthcare providers about any concerns related to dependency or other aspects of medication use.

The Law in the UK

In the United Kingdom, fluoxetine (Prozac) is classified as a prescription-only medication. This means it can only be obtained legally if prescribed by a qualified medical practitioner. The medication falls under the category of selective serotonin reuptake inhibitors (SSRIs), which are commonly used to treat conditions like depression and anxiety disorders.3 Unlike some other substances used in the treatment of mental health conditions, SSRIs like Prozac are not classified under the UK’s Misuse of Drugs Act, which means they are not a controlled substance in the way that some other drugs are.

However, the prescribing and dispensing Prozac are governed by UK medicine laws, including the Medicines Act 1968 and the Human Medicines Regulations 2012. These laws ensure that the medication is only prescribed following an appropriate medical diagnosis and dispensed by a qualified pharmacist.

In terms of legal restrictions, it’s essential to note that possession of Prozac without a prescription is illegal and can result in legal repercussions. Furthermore, the prescription must be made out to the person taking the medicine; giving your medication to someone else is illegal. Failure to comply with these regulations can result in a fine or other legal penalties.

Also, driving while taking Prozac is generally permitted, but if the medication impairs your ability to drive, then doing so is illegal. Patients are advised to see how the medication affects them before driving or operating heavy machinery. 3

For international travel, it is recommended to consult with healthcare providers and check foreign regulations, as carrying prescription medications across borders may have specific requirements or restrictions.

Mixing Drugs

Mixing Prozac (fluoxetine) with other drugs or substances can lead to various interactions, some of which can be serious. For instance, combining Prozac with other medications that affect serotonin levels, such as certain other antidepressants or triptans for migraines, can elevate the risk of serotonin syndrome. This is a potentially life-threatening condition characterised by symptoms like high body temperature, agitation, increased reflexes, and nausea.3

Alcohol is another substance that is commonly questioned in combination with Prozac. While Prozac doesn’t necessarily interact with alcohol, drinking can exacerbate the side effects of the medication, such as drowsiness or impaired judgement. Additionally, alcohol is a depressant, which can counteract the beneficial effects of an antidepressant and potentially worsen the underlying mental health condition.

Another category of drugs to be cautious about is anticoagulants like warfarin. Prozac can increase the effectiveness of these drugs, thereby increasing the risk of bleeding.9 Individuals on anticoagulants should have their blood clotting monitored more frequently if they start taking Prozac.

It’s also critical to be aware of over-the-counter medications and supplements. For example, taking nonsteroidal anti-inflammatory drugs (NSAIDs) can increase the risk of gastrointestinal bleeding when taken with Prozac. 2

When it comes to illicit drugs, the interactions can be even more unpredictable and risky. Stimulants like cocaine or amphetamines can have severe cardiovascular interactions with Prozac, while sedatives can increase the risk of respiratory depression and sedation.

Furthermore, Prozac can interact with Monoamine oxidase inhibitors (MAOIs), a class of antidepressants. Combining these can lead to a dangerous rise in serotonin levels, causing serotonin syndrome.3

Given the complexities associated with drug interactions, it’s imperative to consult healthcare providers when considering any new medication, supplement, or substance while taking Prozac. Physicians usually conduct a thorough review of all medications a patient is taking, including over-the-counter drugs and supplements, to assess the risk of drug interactions.

In summary, mixing Prozac with other drugs can lead to a variety of interactions, ranging from an increase in side effects to severe, life-threatening conditions. Always consult a healthcare provider for personalised medical advice, especially if you’re considering combining Prozac with other medications or substances.


  1. Nature. (n.d.). SSRIs: The history of SSRIs. Retrieved from
  2. DrugBank. (n.d.). Fluoxetine. Retrieved from
  3. NHS. (n.d.). Fluoxetine (Prozac). Retrieved from
  4. Medical News Today. (n.d.). What is Prozac? Retrieved from
  5. NYTimes. (n.d.). Prozac Drug. Retrieved from
  6. Renaissance Recovery. (n.d.). Prozac Side Effects, Addictions, FAQs. Retrieved from
  7. Mind. (n.d.). Fluoxetine. Retrieved from
  8. Harmony Stuart. (n.d.). Is Prozac Addictive? Retrieved from
  9. WebMD. (n.d.). Prozac Oral: Uses, Side Effects, Interactions, Pictures, Warnings & Dosing. Retrieved from

What people ask

Prozac is primarily prescribed for treating various conditions such as depression, obsessive-compulsive disorder (OCD), and panic disorder. The medication can also be used to treat other issues like bulimia nervosa and premenstrual dysphoric disorder (PMDD).

Prozac functions by inhibiting the reuptake of serotonin, a neurotransmitter in the brain. This action increases the availability of serotonin, thereby enhancing mood and reducing symptoms of depression and other mental health conditions.

The medication is usually available in capsule or liquid form. It should be taken as prescribed by a healthcare provider. Typically, it is taken once daily, either in the morning or evening. Patients are advised to follow their doctor’s instructions and not to stop taking the medication abruptly without medical advice.

The common side effects associated with Prozac use include nausea, insomnia, headaches, dizziness, and fatigue. While most of these are mild and temporary, some can be more severe and may require medical attention.

Prozac has the potential to interact with a range of other medications. These include other types of antidepressants, anticoagulants, and certain over-the-counter drugs like nonsteroidal anti-inflammatory drugs (NSAIDs). It is crucial to consult a healthcare provider before combining Prozac with other medications.

Prozac is generally not considered to be addictive. However, stopping the medication abruptly may result in withdrawal symptoms, such as irritability, nausea, and dizziness.

Drinking alcohol while taking Prozac is generally not recommended. Alcohol can worsen the medication’s side effects and may also counteract its effectiveness.

Pregnant women should consult their healthcare provider for a detailed risk-benefit analysis before taking Prozac, as the medication may pose certain risks during pregnancy.

The medication generally takes several weeks to exhibit its full effects. Patients are often advised to continue taking the medication, even if they don’t experience immediate improvements.

If a dose is missed, it should be taken as soon as it is remembered unless it’s almost time for the next scheduled dose. Taking a double dose to compensate for a missed one is not advised.

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What to do in an emergency

If you or a someone else requires urgent help after consuming alcohol or drugs, do not hesitate – call 999 immediately and speak to a person trained to assist you. It could be the difference between life and death.