Letrozole is one of the cheapest drugs in oncology and one of the longest-running. A postmenopausal woman on adjuvant endocrine therapy for hormone receptor positive early breast cancer typically takes one 2.5 mg tablet a day for about five years, and at generic prices that entire five-year course costs less than a single month of almost any other cancer drug.
The complication is that letrozole has a second life. Fertility clinics use it off-label for ovulation induction, a use that a National Institutes of Health review describes as generally limited to five days at 2.5 to 7.5 mg daily. That is a completely different purchase: five to fifteen tablets instead of 1,826. This guide prices both, plus the brand (Femara) that Novartis still sells for roughly 67 times the generic. Every figure below was researched on September 3, 2026.
What Does Letrozole Cost Without Insurance?
The low column is the CMS National Average Drug Acquisition Cost, the federal survey of what retail pharmacies actually pay, at $0.15111 per generic 2.5 mg tablet effective August 19, 2026. The average column mixes Cost Plus Drugs and 2024 Medicare Part D average spending per dosage unit ($0.3358688). The high column is the Drugs.com cash retail price. Dosing comes from the FDA-approved Femara prescribing information, which specifies 2.5 mg once daily with a median adjuvant treatment duration of five years.
| Letrozole purchase | Low | Average | High |
|---|---|---|---|
| One generic 2.5 mg tablet | $0.15 | $0.25 | $0.40 |
| 30-day supply, 2.5 mg daily | $4.53 | $7.48 | $12.06 |
| 90-day supply, 2.5 mg daily | $13.60 | $20.58 | $30.23 |
| Five-year adjuvant course (1,826 tablets) | $275.93 | $613.30 | $734.05 |
| Brand Femara, 30 tablets | $750.78 | $782.13 | $813.48 |
| Generic anastrozole comparator, 30 tablets | $4.20 | $6.48 | $8.75 |
| Brand Arimidex, 30 tablets | $1,510.56 | $1,548.21 | $1,585.85 |
| Ovulation induction cycle, 2.5 mg for 5 days | $0.76 | $1.68 | $2.01 |
| Ovulation induction cycle, 7.5 mg for 5 days | $2.27 | $5.04 | $6.03 |
| Medicare Part D average per letrozole claim, 2024 | $22.30 | $22.30 | $22.30 |
On the brand and comparator rows, the low and high are two independent federal figures with the midpoint in between: 2024 Medicare Part D average spending per dosage unit at one end and the August 2026 NADAC acquisition cost at the other. They land in different orders depending on the product, which is itself worth noticing.
Two vintage notes matter here. The generic letrozole NADAC row is effective August 19, 2026, but the brand FEMARA 2.5 MG TABLET row in the same dataset is a January 7, 2026 vintage at $27.11602 per tablet, seven months older. This guide states that split rather than presenting the two as a matched pair. The generic anastrozole ($0.14007) and brand ARIMIDEX ($52.86163) rows are both August 19, 2026.
Treat the ovulation induction lines as the drug content of a cycle, not a purchasable package. The smallest quantity Drugs.com prices is 30 tablets at $12.06, and most pharmacies will dispense the bottle rather than count out five tablets.
For scale, Medicare Part D spent $19.19 million on generic letrozole across 860,689 claims for 213,551 beneficiaries in 2024, at an average of $22.30 per prescription claim. Brand Femara accounted for 905 claims from 208 beneficiaries at an average of $1,448.31 per claim. That is a small enough sample to read as directional, but the direction is unmistakable.
What Drives the Price
Eight marketed generics. FDA’s Drugs@FDA database lists 24 letrozole applications, of which eight products carry an active prescription marketing status and 14 are discontinued. That is a mature, crowded generic market, and crowded generic markets produce fifteen-cent tablets.
The brand never repriced. Femara is still actively marketed by Novartis and still costs about 180 times the generic per tablet in federal acquisition data. Brand Arimidex is worse: $52.86163 per tablet in the same NADAC file against $0.14007 for generic anastrozole, a 377x spread. Nothing about a cash payer’s situation makes either brand a sensible purchase, but both remain on pharmacy shelves and both will be dispensed if the prescription says “dispense as written.”
Fill length, not price per pill. The per-tablet price falls sharply with quantity. Drugs.com prices letrozole at $0.40 per tablet in a 30-count, $0.23 in a 90-count and $0.15 in a 1,000-count. On a five-year prescription, choosing 90-day fills over 30-day fills is worth roughly $316 by itself.
Which counter you walk up to. Cost Plus Drugs lists letrozole 2.5 mg at $7.48 for its default 30-tablet quantity, against a $216.00 retail comparison on its own page. That beats a 30-count retail fill. It does not beat a 90-count retail fill: three Cost Plus fills plus shipping run about $27.44 against $20.58 for 90 tablets at Drugs.com’s cash price. Cost Plus is a good default, not an automatic floor.
The monitoring costs more than the drug. Aromatase inhibitors accelerate bone loss, so a five-year course usually comes with periodic bone density scans and continued imaging. Those line items dwarf the pill. See DEXA scan costs and mammogram costs for what to expect there.
Cash Price vs. Insurance
This is one of the drugs where a cash price can genuinely beat a copay. If your plan has a $20 or $25 generic tier copay and a deductible you have not met, a $7.48 Cost Plus fill or a $12.06 retail cash fill is simply cheaper than running the claim. Ask the pharmacy for the cash price before handing over the card, and ask again at the 90-day fill, because the gap widens with quantity.
For Medicare beneficiaries the arithmetic is similar. Part D averaged $22.30 per letrozole claim in 2024, which includes both plan and patient dollars, against a $12.06 to $20.58 cash window depending on fill size. That is not a reason to drop coverage, but it is a reason to price the fill both ways.
The one place insurance clearly matters is the brand. If a prescriber has written for Femara specifically and a plan covers it, use the coverage. If you are paying cash, ask whether generic substitution is acceptable before you fill, because the difference between the two runs to hundreds of dollars a month.
Fertility use adds a wrinkle: because ovulation induction is an off-label use of letrozole, some plans deny it outright even though the tablet is a generic. At $2 to $6 of drug per cycle, that denial is not worth appealing. The cost of IUI and the cost of IVF without insurance are the numbers that decide a fertility budget.
How to Pay Less
Fill 90 days at a time. This is the single highest-value move on a five-year prescription. Drugs.com prices 90 tablets at $20.58 against $12.06 for 30, so the 90-day fill costs $0.23 per tablet instead of $0.40. Ask the prescriber to write the prescription that way from the start.
Price Cost Plus against a plain retail 90-count. Cost Plus Drugs charges $7.48 for letrozole 2.5 mg plus $5 shipping, which is excellent on a 30-day basis and mediocre on a 90-day basis. Run both numbers rather than assuming. Our comparison of GoodRx vs. SingleCare discount cards covers how to check a third option at your local pharmacy.
Do not assume the $4 list. Letrozole is not on the Walmart Prescription Program at any tier. Two independent text extractions of Walmart’s own program PDF, effective March 24, 2025, return zero matches for letrozole, anastrozole or tamoxifen, and the list carries no oncology or hormone-therapy category. Switching to anastrozole does not get you onto it either.
Refuse the brand unless someone else is paying. Femara and Arimidex are the two most expensive mistakes available on this page, and both are avoided by a single sentence at the pharmacy counter.
Get the drug through a safety-net pharmacy if you have no coverage at all. Federally qualified health centers buy at 340B prices and often pass the discount through on a sliding scale. Our guide to free and sliding-scale clinics explains how to find one, and it matters far more for the oncology visits and scans than for the tablet itself.
Negotiate the imaging and specialist bills, not the pharmacy bill. There is nothing to negotiate on a $12 prescription. There is a great deal to negotiate on the scans and visits that surround it, and on any hospital-based portion of cancer care. Start with how to negotiate medical bills and check a quoted price against national data with our fair price tool.
The Bottom Line
Generic letrozole is a $4.53 to $12.06 monthly purchase and a $276 to $734 five-year purchase, which makes it one of the few genuinely affordable drugs a cancer patient will encounter. The two ways to overpay are buying brand Femara at roughly $750 to $813 a month and filling 30 tablets at a time for five years instead of 90.
For fertility, the tablet is a rounding error and the cycle is not. Clomid costs covers the other first-line ovulation induction drug and prices the two side by side. If your treatment plan moves beyond endocrine therapy, chemotherapy costs and Ibrance costs cover what comes next, and tamoxifen costs cover the drug most premenopausal patients take instead of an aromatase inhibitor.