Arimidex Shortage Update: What Patients Need to Know in 2026

If you're taking Arimidex (anastrozole) for breast cancer treatment and you've run into trouble filling your prescription, you're naturally wondering: is this a real shortage? Is it going to get worse? What should I do right now? Here's the complete, factual picture as of 2026.

Current Shortage Status: Is Arimidex in Shortage in 2026?

As of 2026, anastrozole is NOT on the FDA's official drug shortage list. The FDA maintains a public database of active drug shortages, and anastrozole does not appear on that list. Generic anastrozole is manufactured by multiple companies — including Teva, Mylan (Viatris), Hikma, and Sun Pharma — providing meaningful redundancy in the supply chain.

Brand-name Arimidex, originally developed and sold by AstraZeneca, is still available through specialty channels, but its patent expired around 2010-2012, and the market has largely shifted to generic anastrozole. Both the brand and generic are considered widely available from a national supply standpoint.

Why Are Some Patients Still Having Trouble Finding It?

Even when a drug isn't in a national shortage, individual patients may still struggle to fill their prescription. Here are the real reasons anastrozole can be hard to find at a specific pharmacy:

• Localized inventory gaps. A pharmacy may carry one specific manufacturer's generic and temporarily run out when that supplier has a delay. Another pharmacy a few miles away may have plenty.
• Temporary manufacturing hiccups. In early 2025, a brief manufacturing delay at one supplier caused a roughly 12% price and supply bump nationally for a few weeks. This resolved without becoming an official shortage.
• Insurance formulary issues. Some insurance plans specify a particular manufacturer's generic, and if that manufacturer has a supply issue, the pharmacy may not be authorized to substitute another without prior authorization.
• Pharmacy ordering patterns. Smaller or less-busy pharmacies may not keep large quantities of anastrozole on hand, ordering only enough for their regular patients. If you're new to their pharmacy or they've had an unexpected rush, they may be temporarily out.

Historical Context: Has Anastrozole Ever Been in Shortage?

Anastrozole has been on the FDA shortage list in the past, but these periods have been relatively brief and have resolved without long-term supply disruption. The availability of multiple generic manufacturers has generally provided a buffer against sustained shortages. Compare this to some other oncology drugs, where a single manufacturer's production problem can cause nationwide crises — anastrozole's multi-manufacturer landscape makes it more resilient.

What Patients Should Do Right Now

Whether you're dealing with a current availability problem or just want to be prepared, here are the most important steps:

1. Don't skip doses. If you run low, contact your oncologist immediately. Skipping doses of a breast cancer medication without medical guidance is not the right response.
2. Call multiple pharmacies. Inventory varies dramatically by location. Try chain pharmacies, independent pharmacies, and hospital pharmacies in your area.
3. Use medfinder. medfinder.com calls pharmacies near you to find who can fill your anastrozole prescription — without you spending hours on hold.
4. Ask about 90-day supplies. If you find a pharmacy that has it, ask for a 90-day supply to reduce the frequency of future refill challenges.
5. Contact your oncologist. If anastrozole is genuinely not available in your area, your oncologist can consider a temporary switch to letrozole or exemestane — both are clinically similar aromatase inhibitors.

How to Check Official FDA Shortage Information

The FDA maintains a public drug shortage database at fda.gov/drugs/drug-safety-and-availability/drug-shortages. You can search for anastrozole to see if it has been added since the publication of this article. ASHP (American Society of Health-System Pharmacists) also maintains a drug shortage database at ashp.org that is frequently updated with additional detail.

The Bottom Line for Arimidex Availability in 2026

There is no national shortage of anastrozole in 2026. The drug is widely available as a generic from multiple manufacturers. However, localized pharmacy inventory issues do occur, and some patients may have difficulty at their specific pharmacy. The solution is to check other nearby pharmacies, use a service like medfinder to do the calling for you, and involve your oncologist if there is a genuine prolonged supply problem in your area. Read our guide on how to find Arimidex in stock near you or learn about alternatives to Arimidex in case your pharmacy is completely out.