Key takeaways
Lexapro (escitalopram) and Prozac (fluoxetine) are prescription antidepressants that treat depression and anxiety-related conditions.
Prozac has a longer duration of action, while Lexapro can be better for those who are sensitive to side effects.
Your healthcare provider considers your mental health symptoms, health history, response to medication, and drug interactions to provide recommendations that would be safe and effective for you.
Lexapro (escitalopram oxalate) and Prozac (fluoxetine hydrochloride) are two prescription antidepressant drugs in the group of drugs called selective serotonin reuptake inhibitors (SSRIs). They’re both approved by the U.S. Food and Drug Administration (FDA) to treat depression and anxiety-related disorders. The two drugs have different active ingredients, which can produce different responses in people taking them. In this article, learn about Lexapro and Prozac, and how they compare in what they treat, how they work, side effects, and cost.
Compare Lexapro vs. Prozac key differences |
||
|---|---|---|
| Difference | Lexapro | Prozac |
| Drug class | Selective serotonin reuptake inhibitor | Selective serotonin reuptake inhibitor |
| Brand/generic status | Brand | Brand |
| What is the generic name? | Escitalopram oxalate | Fluoxetine hydrochloride |
| What form(s) does the drug come in? | Tablet, oral solution | Capsule, tablet, oral solution, delayed-release capsule |
| What is the standard dosage? | 10 mg once daily | 20–60 mg once daily in the morning |
| How long is the typical treatment? | Long-term | Long-term |
| Who typically uses the medication? |
|
|
RELATED: What is Prozac? │ What is Lexapro?
While Lexapro is only FDA approved to treat major depressive disorder (MDD) and generalized anxiety disorder (GAD), Prozac is approved to treat other depression and anxiety disorders in addition to MDD. The two medications also have a few off-label uses as well. Lexapro is used off-label for other anxiety disorders, premenstrual dysphoric disorder (PMDD), and hot flashes associated with menopause. Prozac is used off-label for PMDD, other psychiatric concerns, and Raynaud’s phenomenon.
Compare Lexapro vs. Prozac conditions treated |
||
|---|---|---|
| Condition | Lexapro | Prozac |
| Major depressive disorder (MDD) | Yes | Yes |
| Generalized anxiety disorder (GAD) | Yes | Off-label |
| Obsessive-compulsive disorder (OCD) | Off-label | Yes |
| Bulimia nervosa | No | Yes |
| Panic disorder | Off-label | Yes |
| Bipolar depression | Off-label | Yes, in combination with olanzapine |
| Treatment-resistant depression | No | Yes, in combination with olanzapine |
| Social anxiety disorder | Off-label | Off-label |
| Post-traumatic stress disorder (PTSD) | Off-label | Off-label |
| Premenstrual dysphoric disorder (PMDD) | Off-label | Off-label |
| Hot flashes during menopause | Off-label | Off-label |
| Binge eating disorder | No | Off-label |
| Borderline personality disorder | No | Off-label |
| Raynaud phenomenon | No | Off-label |
| Selective mutism | Off-label | Off-label |
Is Prozac better than Lexapro?
Whether Lexapro or Prozac is better for someone’s mood symptoms depends on factors such as their symptoms, how they react to the drug, and the side effects they may experience.
SSRIs like Prozac and Lexapro are commonly prescribed as first-line treatments for depression and many related mental health conditions in adults, adolescents, and children. SSRIs increase the amount of serotonin, a chemical that helps to regulate mood, in the brain. Lexapro and Prozac have very different durations of action and, as a result, can produce different effects in individuals taking them.
In clinical studies, Lexapro was found to be better than other antidepressants during the acute phase of depression, but there’s no significant difference between Lexapro and other antidepressants during the maintenance phase of treatment. The acute phase of depression treatment is the first six to 12 weeks of treatment, where symptoms are treated to remission, meaning the person’s depressive symptoms are resolved. In studies comparing fluoxetine and escitalopram in people with MDD, there was no significant difference in how well the two drugs controlled psychological distress.
Prozac is less likely to cause withdrawal symptoms
“There are two main differences between escitalopram and fluoxetine,” says Douglas McWilliams, MD, board-certified psychiatrist at McWilliams Psychiatry in Columbia, Maryland. “The primary difference is in their length of action. Fluoxetine is much longer-lasting and has a much longer half-life. Because of this, it tends to stay in people’s systems longer, even after discontinuation,” Dr. McWilliams says. Lexapro has a half-life of between 27 and 32 hours, while Prozac has a half-life of two to four days. When Prozac is metabolized, the active chemical has an even longer half-life of seven to nine days.
“Because of the long half-life of fluoxetine, it tends to be more forgiving in people who sometimes forget their medication. The long half-life keeps blood concentrations more stable, so if a dose is missed, it is less likely to cause withdrawal symptoms,” he says.
RELATED: Lexapro dosage │Prozac dosage
Which drug is best for you can vary by individual. Seek medical advice from your healthcare provider to build the treatment plan that’s safest and most effective for you.
Lexapro vs. Prozac: Insurance coverage and cost comparison
Lexapro and Prozac are brand-name products with generic versions widely available and more affordable. On average, Lexapro costs $570 for 30, 10 mg tablets, but its generic Lexapro (escitalopram) is less expensive at an average retail price of $122 for 30, 10 mg tablets without insurance or coupons.
Brand-name Prozac has been discontinued, but generic Prozac (fluoxetine) costs about $67 for 30, 20 mg capsules without insurance or coupons.
RELATED: Lexapro generic │ Prozac generic
Because of the cost difference between brand-name and generic versions of the two drugs, most insurance plans, including Medicaid and Medicare plans, cover generic escitalopram and fluoxetine over Lexapro and Prozac. Coverage varies by individual plan, so contacting your plan administrator can be helpful to check whether your Lexapro or Prozac prescriptions are covered.
If your insurance plan doesn’t cover Lexapro or Prozac, there are still ways to save. One of them is using a SingleCare coupon, which is free to get and can be used at many retail pharmacies like Kroger, Walgreens, and Walmart pharmacies. With a SingleCare coupon, Lexapro can cost less, $476 for 30, 10 mg tablets, and escitalopram can cost $9 for 30, 10 mg tablets. Fluoxetine can cost about 10 times less, $6 for 30, 20 mg capsules, with a SingleCare coupon.
Compare Lexapro vs. Prozac cost & coverage |
||
|---|---|---|
| Coverage and cost | Lexapro (escitalopram) | Prozac (fluoxetine) |
| Typically covered by insurance? | Yes (as generic escitalopram) | Yes (as generic fluoxetine) |
| Typically covered by Medicare Part D? | Yes (as generic escitalopram) | Yes (as generic fluoxetine) |
| Typically covered by Medicaid? | Yes (as generic escitalopram) | Yes (as generic fluoxetine) |
| Cost without insurance | $570 for 30, 10 mg tablets | $67 for 30, 20 mg capsule |
| SingleCare cost | $9 per 30, 10 mg tablets at Kroger or Harris Teeter | $6 for 30, 20 mg capsules at Kroger or Harris Teeter |
| How to save | Get coupon | Get coupon |
Lexapro vs. Prozac side effects
SSRIs are preferred treatments because they’re better tolerated compared to other antidepressants such as tricyclic antidepressants (TCAs) and monoamine oxidase inhibitors (MAOIs). Lexapro and Prozac have similar side effect profiles, but their differences might help someone and their healthcare provider choose the right treatment.
Both Lexapro and Prozac share the following common side effects:
- Decreased libido
- Increased trouble sleeping or restlessness
- Stomach upset or loss of appetite
- Increased sweating
While Lexapro has a higher risk of causing weight gain and drowsiness compared to Prozac, Prozac has a slightly higher risk of causing insomnia compared to Lexapro. Both can be used in people who have high blood pressure.
Healthcare providers consider side effect profiles and your medical conditions when choosing treatments. For example, healthcare providers may prescribe Lexapro instead of Prozac for anxiety in some patients. “Patients who have more anxiety symptoms who are more sensitive to side effects may benefit more from Lexapro (escitalopram),” says Brian Zachariah, MD, psychiatrist with Mindpath Health in Katy, Texas. “Whereas those with depression plus OCD, panic disorder, at risk for medication withdrawal or difficulty remembering to take medications (since fluoxetine has a once-weekly option) may benefit from Prozac (fluoxetine) use,” he says.
Since Lexapro has a lower risk of causing insomnia, healthcare providers may recommend it for those with sleep and anxiety issues. “I often prescribe it to be taken at night for patients who have trouble sleeping or who experience a lot of anxiety along with their depression. That calming effect can be very helpful for the right patient,” says Ritu Goel, MD, board-certified psychiatrist and founder and CEO of MindClaire in Long Beach, California.
Having certain genes makes the body break down some drugs faster. This can influence what side effects they experience on antidepressants like Lexapro and Prozac. “This matters if patients have genetic factors that impact their metabolism of medications and can increase the risk of side effects if there are abnormalities,” Dr. McWilliams explains.
RELATED: Lexapro side effects │Prozac side effects
Lexapro and Prozac drug interactions and warnings
Since Lexapro and Prozac prolong the activity of serotonin in the nervous system, any drugs or conditions that increase serotonin levels may increase the risk of serotonin syndrome, which can show as agitation, fever, and confusion. Drugs that can increase the risk of serotonin syndrome with Lexapro or Prozac include tricyclic antidepressants, buspirone, amphetamines, lithium, and triptans.
Taking Lexapro and Prozac can also interact with platelet function, and taking them with nonsteroidal antiinflammatory drugs (NSAIDs) or aspirin or other blood thinners like warfarin may increase the risk of bleeding. Those taking antiarrhythmic medications like quinidine and procainamide should know that Prozac and Lexapro can increase the QT interval of the heart rhythm.
There are risks associated with taking either Prozac or Lexapro during pregnancy or breastfeeding.
SSRIs, including Prozac and Lexapro, come with a black box warning about their potential to increase suicidal thoughts and behavior in children, adolescents, and young adults under 24 years old. Patients on these medications should know about this risk so their families, caregivers, and health team can watch for the signs and symptoms of increased suicidality. If you notice worsening symptoms of depression and suicidal thoughts, help is available immediately. Text or call 988 to get help right away or 911 to activate emergency services.
Bottom line: Which is better?
Lexapro and Prozac are two antidepressants that can help people with depression and certain anxiety disorders. They work similarly but come with slightly different risks of side effects. Though there is some research on Lexapro and its generic being better for the initial phase of treatment, there isn’t a significant difference between how well Lexapro and Prozac work on average. Lexapro’s side effect profile makes it better for people who are sensitive to side effects, while Prozac’s duration of action might be better for those who tend to forget regular dosing.
Work with your healthcare professional to understand the options that could be for you. Your healthcare provider will consider your symptoms, response to medications, health history, and drug interactions to recommend safe and effective treatment options for you. “The best antidepressant is ultimately the one the patient will take consistently, tolerate, and that fits the clinical picture. That requires a genuine conversation, not just a prescription pad,” Dr. Goel says.
Frequently asked questions
How long does it take for Prozac to work?
It takes four to eight weeks for Prozac to make significant improvements in mood and anxiety, but some people experience an improvement in physical symptoms sooner.
How long does it take for Lexapro to work?
While some symptoms show improvement within the first couple of weeks, it could take about six to eight weeks for depressed mood and lack of interest in activities to fully improve.
Does Prozac cause weight gain?
No. Weight gain is not a listed side effect on Prozac’s prescribing information. Significant weight gain is relatively uncommon in people taking Prozac.
Does Lexapro cause weight gain?
No. Even though weight changes are associated with some antidepressants, weight gain is not a reported side effect of Lexapro.
Can you drink on Prozac?
It isn’t recommended to drink on Prozac. Combining Prozac and alcohol can increase the risk of side effects like drowsiness and worsen mental health symptoms.
Can you drink on Lexapro?
You shouldn’t drink on Lexapro. Combining Lexapro and alcohol can increase the risk of side effects and worsen symptoms of depression.
The SingleCare prices in this article are the most accurate at the time of publishing in ZIP code 23666 as of May. 5, 2026. Prices vary by pharmacy. Visit our coupon page for updated drug prices at pharmacies near you.
- Lexapro – escitalopram oxalate tablet, film coated, DailyMed (2023)
- Prozac – fluoxetine hydrochloride capsule, DailyMed (2026)
- Escitalopram, StatPearls [Internet] (2023)
- Fluoxetine, StatPearls [Internet] (2024)
- Selective serotonin reuptake inhibitors, StatPearls [Internet] (2023)
- Escitalopram versus other antidepressive agents for Major Depressive Disorder: a systematic review and meta-analysis, BMC Psychiatry (2023)
- Nonpharmacologic and pharmacologic treatments of adults in the acute phase of Major Depressive Disorder: A living clinical guideline from the American College of Physicians, Annals of Internal Medicine (2023)
- Impact of sertraline, fluoxetine, and escitalopram on psychological distress among United States adult outpatients with a Major Depressive Disorder, Healthcare (2023)
- Comparison of antidepressant medications and their possible side effects, UpToDate (2026)
- Escitalopram (Lexapro), National Alliance on Mental Illness
- Medically accurate: SingleCare’s Medical Review Board analyzes all of our content to confirm it’s in line with current medical advice.
- Evidence-based: Our content is sourced from reputable U.S.-based healthcare professionals and peer-reviewed research.
- Trustworthy: All of SingleCare’s content goes through a multi-phase review process by our writers, editors, and Medical Board in order to provide clear and credible information.