Letrozole for fertility requires a prescription from a doctor, so you’ll get it through a healthcare provider who then sends the prescription to a pharmacy. You cannot buy it over the counter or order it legally without a prescription. The good news: it’s widely available as a generic medication, and a full cycle’s supply can cost under $10 with a discount card.
Who Can Prescribe Letrozole for Fertility
Several types of doctors can write you a prescription for letrozole. Reproductive endocrinologists (fertility specialists) prescribe it most frequently, but OB-GYNs also prescribe it regularly for patients struggling to ovulate. In some cases, your primary care doctor may be willing to prescribe it as well, though most will refer you to a specialist first.
Your path typically starts with a fertility evaluation. A doctor will assess why you’re not conceiving, check your hormone levels, and confirm that letrozole is appropriate for your situation. If you have polycystic ovary syndrome (PCOS) or unexplained infertility, letrozole is often a first-line option. For women with PCOS specifically, letrozole produces a live birth rate of about 25%, compared to roughly 11% with clomiphene (the older, more traditional ovulation-inducing medication).
Where to Fill the Prescription
Once you have a prescription, you can fill it at virtually any retail pharmacy: CVS, Walgreens, Rite Aid, Walmart, or independent pharmacies. Letrozole is available as a generic, so you don’t need a brand-name version. Specialty or fertility pharmacies also carry it, but they’re not necessary for this particular medication.
Online pharmacies that operate with a valid prescription can fill it too. Some telehealth fertility services will evaluate you remotely, write the prescription if appropriate, and send it directly to your local pharmacy or a mail-order pharmacy. This can be a convenient option if you don’t have easy access to a fertility clinic nearby.
What It Costs
Letrozole is one of the most affordable fertility medications available. The retail price for a 30-tablet supply of 2.5 mg tablets is listed around $544, but almost nobody pays that. With pharmacy discount programs or coupons, a 30-tablet supply drops to as low as $7 to $18. Since a single fertility cycle only requires five tablets, your out-of-pocket cost per cycle is minimal.
Insurance coverage varies. Some plans cover letrozole when prescribed for fertility, while others don’t cover fertility treatments at all. Even without insurance, the discounted generic price is low enough that cost is rarely a barrier. Ask your pharmacist about available discount programs if your insurance doesn’t cover it.
Why It Requires a Prescription
Letrozole was originally developed and FDA-approved to treat breast cancer in postmenopausal women. Its use for fertility is considered “off-label,” meaning fertility specialists prescribe it based on strong clinical evidence, but the drug manufacturer never applied for official approval for that purpose. This is a common and well-accepted practice in medicine.
The medication works by temporarily blocking your body’s production of estrogen. When estrogen drops, your brain responds by releasing more follicle-stimulating hormone, which triggers your ovaries to develop and release an egg. Because this process needs monitoring, doctors typically track your response through ultrasound to see how many follicles are developing and when ovulation is likely to occur.
Monitoring matters because letrozole can sometimes cause more than one egg to develop. About 13% of pregnancies from letrozole cycles involve twins, and unlike injectable fertility drugs, letrozole doesn’t carry a meaningful risk of triplets or higher-order multiples.
What to Expect During Treatment
The standard protocol is straightforward. You’ll take 2.5 mg of letrozole daily for five days, starting on day 3 or day 5 of your menstrual cycle. Your doctor may increase the dose in later cycles if you don’t respond to the initial amount. Most women complete the five-day course and then have a monitoring appointment a few days later to check follicle development.
Side effects are generally mild and short-lived since you’re only taking the medication for five days per cycle. The most common ones include hot flashes, headaches, and joint or back pain. Some women experience fatigue, dizziness, or mild nausea. These effects typically resolve within a day or two of finishing the medication.
If you don’t conceive in the first cycle, doctors often continue letrozole for up to three to six ovulatory cycles before considering other approaches. Each cycle is a fresh five-day course timed to the start of your period.
Getting Started
If you don’t already have a fertility doctor, start with your OB-GYN. They can run initial bloodwork and an ultrasound, and either prescribe letrozole themselves or refer you to a reproductive endocrinologist. Many fertility clinics offer an initial consultation within a few weeks, and since letrozole is a simple oral medication rather than an injectable, treatment can begin as soon as your next menstrual cycle after the prescription is written.
For those exploring telehealth, several fertility-focused platforms now offer remote consultations and can prescribe letrozole if your medical history and lab results support it. You’ll still need local monitoring (ultrasounds to track follicle growth), so having a nearby clinic or imaging center is important even if your prescribing doctor is remote.