Why Is Urocit-K XR So Hard to Find? [Explained for 2026]

If you have been standing at a pharmacy counter hearing "we're out of that" when you try to fill your Urocit-K XR prescription, you are not alone. Potassium citrate extended release — sold under the brand name Urocit-K — can be surprisingly difficult to locate at certain pharmacies, despite not being on the FDA's official drug shortage list. Here's what's actually going on, and what you can do about it.

What Is Urocit-K XR and Who Uses It?

Urocit-K XR is the brand name for potassium citrate extended-release tablets, manufactured by Mission Pharmacal. It has been FDA-approved since 1985 to treat three conditions: renal tubular acidosis, hypocitraturic calcium oxalate kidney stones, and uric acid kidney stones with or without calcium stones. The drug works by alkalinizing the urine — raising urinary pH and increasing citrate levels — which makes it harder for kidney stones to form or grow.

Kidney stones are extremely common: they affect roughly 1 in 11 Americans at some point in their lives, and recurrence rates without treatment are high. That makes Urocit-K XR a widely prescribed medication, particularly by urologists and nephrologists. Yet despite solid demand, patients regularly run into availability problems.

Is Urocit-K XR Currently in Shortage?

As of 2026, potassium citrate extended release is not listed on the FDA's official drug shortage database. However, that doesn't mean it's always sitting on the shelf at your local pharmacy. Drugs.com notes that stock shortages and other unknown variables can affect availability for specific strengths like the 15 mEq tablet. This is different from a formal FDA-declared shortage — it's more of a spotty stocking problem.

Why Do Pharmacies Sometimes Run Out of Potassium Citrate ER?

Several factors explain why Urocit-K XR can be difficult to find at a given pharmacy on a given day:

Low stocking priority at smaller pharmacies. Potassium citrate ER is not a top-10 seller at most chains. Small pharmacies often stock only the most common strengths (usually 10 mEq), leaving patients who need 5 mEq or 15 mEq tablets without options.

Brand vs. generic confusion. The brand-name Urocit-K and multiple generic versions are both available. A pharmacy may stock the generic but not the brand, or vice versa. If your prescription is written for a specific brand, the pharmacist may say it's unavailable even when the generic equivalent is in stock.

Intermittent manufacturer supply issues. Like many specialty tablets, potassium citrate ER uses a wax-matrix extended-release formulation that requires precise manufacturing. Occasional production slowdowns can temporarily reduce supply to distributors.

High cash price deters stocking. Brand-name Urocit-K can cost $217–$364 for 100 tablets, which discourages pharmacies from keeping large quantities on hand. Generic potassium citrate ER retails around $84–$99 for a 30-day supply without discounts, though GoodRx coupons can drop that to $13–$15.

Upstream distribution delays. Sometimes the drug is available at the wholesaler level but a pharmacy hasn't received its weekly shipment yet, creating a brief gap that can last a few days to a week.

Which Strengths Are Hardest to Find?

The 10 mEq tablet is generally the easiest to find because it is the most commonly prescribed strength. The 5 mEq and 15 mEq tablets see lower demand and may require calling multiple pharmacies to locate, especially in rural areas. The brand-name Urocit-K (all strengths) tends to be harder to find than generic potassium citrate ER, simply because fewer pharmacies stock it at full inventory levels.

What Should You Do if You Can't Find Urocit-K XR?

Here are the most effective steps patients can take:

Use medfinder. medfinder calls pharmacies near you to check which ones can fill your Urocit-K XR prescription — saving you hours of phone calls.

Ask about generic substitution. If brand-name Urocit-K is unavailable, ask your pharmacist whether generic potassium citrate ER is in stock and whether your prescription allows substitution.

Try independent pharmacies. Independent and compounding pharmacies often have more flexibility in ordering specific medications and may be able to source your prescription faster than chain pharmacies.

Ask your prescriber about alternative strengths. If 15 mEq tablets are unavailable, your doctor may be able to adjust your prescription to equivalent doses using 5 mEq or 10 mEq tablets.

Consider mail-order pharmacy. Mail-order pharmacies like those through Express Scripts, CVS Caremark, or OptumRx often have better inventory of less common strengths and may be more reliable for long-term fills.

Should You Stop Taking Urocit-K XR if You Can't Find It?

Do not stop taking Urocit-K XR without talking to your prescriber first. Missing doses increases your risk of new kidney stone formation, especially if you have a history of recurrent stones. A few days without the medication is unlikely to cause immediate harm, but longer gaps can allow stone-forming conditions to return. Ask your doctor how to manage a supply gap, and see our guide to

alternatives to Urocit-K XR if you're facing an extended supply gap.

How medfinder Can Help

Rather than spending your afternoon calling every pharmacy in town, medfinder does the legwork for you. You provide your medication, dosage, and zip code — medfinder contacts pharmacies in your area to find which ones can fill your Urocit-K XR prescription. Results are sent directly to your phone, so you know exactly where to go before you leave the house. For more tips on locating Urocit-K XR, see our guide on

how to find Urocit-K XR in stock near you