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Bin card · Muscle relaxant ยท half-life

Methocarbamol plasma half-life in healthy volunteers

3 min read · Reviewed

Two methocarbamol tablets laid out beside a muscle-spasm information panel

01Cirrhosis after alcohol abuse

In 8 people whose cirrhosis followed alcohol abuse, mean elimination half-life was 3.38 hours. In 8 age- and weight-matched subjects without that liver disease, the mean was 1.11 hours. Mean total clearance in the cirrhotic group was about 70% lower.

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Generic methocarbamol 750 mg x 30, GoodRx tablet table, 2026 board.

Generic methocarbamol 750 mg, thirty tablets - the strength used for the short courses described above, checked October 2026. GoodRx lists 750 mg x 30 at $29.94 average retail and $2.00 with a coupon. The 500 mg tablet is priced separately. Kaelis Med does not dispense.

02Plasma half-life

In healthy volunteers, the mean plasma elimination half-life of methocarbamol was 1 to 2 hours. In elderly volunteers the mean was 1.5 hours. In younger volunteers the mean was 1.1 hours. Plasma protein binding sat between 46% and 50%. The labeled indication is as an adjunct to rest, physical therapy, and other measures for the relief of discomfort associated with acute, painful musculoskeletal conditions.

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Sources

  1. FDA / Robaxin (methocarbamol) prescribing information, DailyMed set 5666ece8-9a10-4dcc-a7dc-3cd29df10e28

Checked against the current label and reviewed by Dr. Priya Natarajan. See Pick → Check → Tag → Bin.

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