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

Orphenadrine XR — also known as orphenadrine citrate extended-release — is a prescription muscle relaxant used to help relieve the discomfort of acute painful muscle conditions. Whether you're newly prescribed this medication or just want to understand it better, this guide covers everything you need to know: what it does, how to take it, what to avoid, and what to expect.

What Is Orphenadrine XR?

Orphenadrine XR is the extended-release form of orphenadrine citrate — a centrally acting skeletal muscle relaxant that has been available in the U.S. since the 1940s. It was originally sold under the brand name Norflex, which has since been discontinued. Today it is available only as a generic medication.

Orphenadrine is derived from diphenhydramine (the antihistamine in Benadryl) and shares some of its properties — including its anticholinergic effects and sedation. The extended-release formulation allows the drug to work throughout the day with just two doses.

What Is Orphenadrine XR Used For?

Orphenadrine XR is FDA-approved as an adjunct to rest, physical therapy, and other measures for the relief of discomfort associated with acute painful musculoskeletal conditions. In plain language, it's used to help manage the pain and discomfort of:

Muscle strains and sprains

Acute back pain and neck pain caused by muscle injury

Muscle spasms and tightness following injury or overexertion

Musculoskeletal pain from work injuries, sports injuries, or accidents

Orphenadrine is prescribed as part of a broader treatment plan — not as a standalone cure. Rest, physical therapy, and other appropriate pain relievers are used alongside it.

There are also historical off-label uses, most notably in the management of tremors associated with Parkinson's disease. However, this use is largely superseded by newer, more effective medications today.

Orphenadrine XR Dosage: How to Take It

The standard dosage of Orphenadrine XR is:

Dose: 100 mg extended-release tablet, taken twice daily

Timing: One tablet in the morning and one tablet in the evening (approximately 12 hours apart)

With or without food: Can be taken with or without food; take with food if you experience stomach upset

Swallow whole: Do not crush, break, or chew the tablet — this destroys the extended-release mechanism and releases the dose too quickly, which can be harmful

Always follow your prescriber's specific instructions. Doses are determined by your doctor based on your condition and health history.

Who Should NOT Take Orphenadrine XR?

Orphenadrine XR is contraindicated in patients with the following conditions — meaning it should not be used if you have:

Glaucoma (orphenadrine can increase eye pressure)

Benign prostatic hypertrophy or bladder neck obstruction (can worsen urinary retention)

Myasthenia gravis (a neuromuscular disorder)

Pyloric or duodenal obstruction or stenosing peptic ulcers

Cardiospasm (megaesophagus)

Known allergy to orphenadrine

It should also be used with caution in elderly patients (65+) due to anticholinergic risk, and in patients with heart conditions like arrhythmias or cardiac decompensation.

Is Orphenadrine XR a Controlled Substance?

No. Orphenadrine XR is not a DEA-scheduled controlled substance. It does not require special prescribing forms, and prescriptions can be phoned in or sent electronically by your doctor to the pharmacy. However, orphenadrine has been noted to have chronic abuse potential for its euphoric and mood-elevating effects, so it's still important to take it exactly as prescribed.

Key Safety Points to Know Before Taking Orphenadrine XR

Avoid alcohol — it significantly worsens drowsiness and sedation.

Do not drive until you know how the medication affects you.

Tell your doctor about all other medications you take, especially opioids, antihistamines, sleep aids, and other anticholinergic drugs.

Blood work: If taking Orphenadrine XR long-term, periodic blood, urine, and liver function tests are recommended.

For a more detailed breakdown of side effects, see our full guide on Orphenadrine XR side effects.