Chlorzoxazone is a muscle relaxant sold in the U.S. under 3 brand and generic names, for muscle cramp, muscle rigidity and myositis. Below: what the FDA label says, every product that contains it, what the pills look like, and its recall record.
From the FDA label for Chlorzoxazone (application ANDA081298). Other chlorzoxazone products — different forms, different strengths — are dosed differently. Follow the label for the one you were prescribed.
Usual Adult Dosage One tablet three or four times daily. If adequate response is not obtained with this dose, it may be increased to one and one-half tablets (750 mg) three or four times daily. As improvement occurs dosage can usually be reduced.
Chlorzoxazone containing products are usually well tolerated. It is possible in rare instances that chlorzoxazone may have been associated with gastrointestinal bleeding. Drowsiness, dizziness, lightheadedness, malaise, or over-stimulation may be noted by an occasional patient. Rarely, allergic type skin rashes, petechiae, or ecchymoses may develop during treatment. Angioneurotic edema or anaphylactic reactions are extremely rare. There is no evidence that the drug will cause renal damage. Rarely, a patient may note discoloration of the urine resulting from a phenolic metabolite of chlorzoxazone. This finding is of no known clinical significance. To report SUSPECTED ADVERSE EVENTS, contact Aurobindo Pharma USA, Inc. at 1-866-850-2876 or FDA at 1-800- FDA-1088 or http://www.fda.gov/ for voluntary reporting of adverse reactions.
Chlorzoxazone is contraindicated in patients with known intolerance to the drug.
Same active ingredient — different manufacturer, form, price and FDA recall record. That last one is what our independent score measures.
| # | Drug | Rating | Type | Form | Generic? | Typical price | |
|---|---|---|---|---|---|---|---|
| 1 | 68/100 | Prescription | Tablet | Generic | $16 | View → | |
| 2 | Not yet rated | Prescription | Tablet | Generic | $16 |
Imprint codes, colour and shape from the FDA’s labelling data. Match the imprint on your pill — or search any imprint.
| Imprint | Strength | Colour | Shape | Maker |
|---|---|---|---|---|
| A13;500 | 500 mg | white | capsule | — |
| N;500 | 500 mg | orange | round | — |
| A26;250 | 250 mg | white | capsule | — |
| ADG;250 | 250 mg | white | oval | — |
| WPI;39;68 | 500 mg | white | oval | — |
Sources: FDA openFDA drug label, National Drug Code Directory, and Enforcement (recall) database. This page reproduces public FDA data and is not medical advice. Dosing is set by your prescriber.
| View → |
| 3 | Not yet rated | Prescription | Tablet | Generic | $16 | View → |