LEXAPRO vs PROZAC
Independent side-by-side comparison.
Two SSRIs that are far more alike than the internet pretends. Two labelled differences worth knowing are what each is approved to treat, and how long fluoxetine lingers in the body — and the choice belongs to your prescriber.
The key difference
One difference that matters is how long the drug stays in you. Prozac's label carries a warning headed "Long Elimination Half-Life": fluoxetine and its active metabolite clear slowly, so a dose change is not fully reflected in the blood for several weeks, affecting both titration and withdrawal. The label's own arithmetic shows it — an MAOI must not be started until 5 weeks after stopping Prozac, versus 14 days after stopping Lexapro.
Their approved uses also differ. Lexapro is approved for major depressive disorder and generalized anxiety disorder. Prozac is approved for major depressive disorder, OCD, bulimia nervosa, and panic disorder.
Both labels name SEROTONIN SYNDROME, which can occur even on the drug alone and is why both are contraindicated with MAOIs, linezolid, and intravenous methylene blue. Both carry the antidepressant BOXED WARNING on suicidal thoughts and behaviors in children, adolescents, and young adults. Both warn of DISCONTINUATION SYNDROME: the labels say to taper gradually and watch for symptoms — do not stop on your own.
What favours Lexapro (escitalopram)
Escitalopram is the one with a generalized anxiety disorder indication (adults and children 7 and older), so a GAD diagnosis points here. Its shorter clearance also means dose changes show up faster and an MAOI washout is 14 days rather than 5 weeks — relevant if your prescriber may need to switch you. It has no thioridazine contraindication.
What favours Prozac (fluoxetine)
Fluoxetine is the one approved for OCD, bulimia nervosa, and panic disorder, and the one used with olanzapine for bipolar I depression and treatment-resistant depression. Its long half-life is a labelled caution, not a feature, but it means the drug leaves slowly. Its label adds a thioridazine contraindication and QT-prolongation warnings that escitalopram's does not.
Bottom line
For plain depression, these two are close cousins, and the honest answer is that neither is "better" — prescribers pick on your specific diagnosis, your other medicines, and what you have tolerated before. Labelled splits include the indications (GAD points to Lexapro; OCD, bulimia, or panic points to Prozac) and fluoxetine's long elimination half-life. Bring your full medication list, including St. John's wort, triptans, tramadol, and linezolid, because serotonin syndrome is the risk both share. Never stop either abruptly. We do not sell these drugs or coupons — we rate them on their FDA recall record, which is why we can say "these are basically the same, ask your doctor."
This is not a summary of either drug’s FDA label, and it is not complete. Both labels carry warnings, contraindications and interactions that are not on this page. Read the label for the drug you are actually taking — we link both above — and take the decision to your prescriber.
Possible drug interaction. LEXAPRO and PROZAC are different prescription medicines. Combining or switching between them can cause interactions — talk to a pharmacist or prescriber before making changes. This page is not medical advice.
Rating
Pharmacy pays
Type
Active ingredient
Manufacturer
Dosage forms
Drug class
Boxed warning
Half-life
Treats
Frequently asked questions
Which is cheaper, Lexapro or Prozac?
Prozac costs pharmacies less to acquire — about $0.05 vs $0.14 per ml, per the CMS NADAC survey. That gap is in the pharmacy's cost of goods, not necessarily in what you pay: your price is set afterwards by your insurer and the pharmacy.
What is the difference between Lexapro and Prozac?
Lexapro contains Escitalopram Oxalate, while Prozac contains Fluoxetine Hydrochloride — they have different active ingredients.
Ratings are based on FDA regulatory (recall-safety) data. This comparison is for general reference only — not medical advice. Always consult a licensed professional before choosing or switching a medication.