What Is Tolterodine XR? Uses, Dosage, and What You Need to Know in 2026

Tolterodine XR (tolterodine tartrate extended-release capsules) is a once-daily prescription medication used to treat overactive bladder (OAB). It was previously sold under the brand name Detrol LA, which was discontinued by Pfizer — but the generic version remains widely available from multiple manufacturers. Here's everything you need to know about Tolterodine XR in 2026.

What Is Tolterodine XR Used For?

Tolterodine XR is FDA-approved for the treatment of overactive bladder (OAB) with the following symptoms:

Urinary urgency — a sudden, strong urge to urinate that's hard to delay

Urinary frequency — urinating more than 8 times per day

Urge urinary incontinence — leaking urine when you feel an urgent need to go

OAB affects approximately 33 million Americans, particularly adults over 40. It is more common in women, but affects men and women of all ages. Tolterodine XR is one of the most commonly prescribed treatments for this condition.

What Type of Drug Is Tolterodine XR?

Tolterodine XR belongs to the drug class called antimuscarinics (also called anticholinergics or antispasmodics). It works by blocking muscarinic receptors in the bladder, reducing the bladder's tendency to contract inappropriately. This decreases the urgency, frequency, and leakage associated with OAB.

Tolterodine XR Dosage and How to Take It

Tolterodine XR comes in two strengths: 2 mg and 4 mg extended-release capsules.

Standard adult dose: 4 mg once daily

Reduced dose (2 mg once daily) for: Patients with mild-to-moderate liver disease, severe kidney disease (CrCl 10–30 mL/min), or those taking strong CYP3A4 inhibitors (e.g., ketoconazole, clarithromycin, ritonavir)

How to take tolterodine XR:

Swallow the capsule whole with water — do NOT crush, chew, or open the capsule

Can be taken with or without food

Take at the same time each day for consistent blood levels

If you miss a dose, take it when you remember unless it's almost time for your next dose — never double up

Who Should NOT Take Tolterodine XR?

Tolterodine XR is contraindicated (should not be used) in patients with:

Urinary retention (inability to empty the bladder)

Gastric retention (slow stomach emptying)

Uncontrolled narrow-angle glaucoma

Known allergy to tolterodine or fesoterodine (Toviaz)

Severe liver disease (Child-Pugh Class C)

Use with caution in patients with: myasthenia gravis, controlled narrow-angle glaucoma, significant bladder outflow obstruction, gastrointestinal disorders, kidney disease, or a history of QT prolongation.

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Is Tolterodine XR a Controlled Substance?

No. Tolterodine XR is not a DEA scheduled/controlled substance. You can fill it at any pharmacy, get it through telehealth, and transfer your prescription without any controlled substance restrictions.

How Long Does It Take for Tolterodine XR to Work?

Most patients begin to notice some improvement in OAB symptoms within 1–2 weeks of starting Tolterodine XR. The full therapeutic effect may take 4–8 weeks to become apparent. If your symptoms haven't improved after 8–12 weeks at the recommended dose, talk to your doctor about adjusting treatment.

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What If I Can't Find Tolterodine XR at My Pharmacy?

Tolterodine XR is not in a national shortage in 2026, but some pharmacies may be temporarily out of stock. medfinder.com calls pharmacies near you to find which ones have it in stock. For a complete guide to locating it, see How to Find Tolterodine XR in Stock Near You.