Although not all of these side effects may occur, if they do occur they may need medical attention. Check with your doctor immediately if any of the following side effects occur while taking methocarbamol: Incidence not known Some side effects of methocarbamol may occur that usually do not need medical attention. Plaquenil and dental inplants Hydroxychloroquine tinnitus What type of drug is hydroxychloroquine Methocarbamol Robaxin is an oral medication used to treat muscle pain and stiffness. Learn about side effects, warnings, dosage, and more. Find information about common, infrequent and rare side effects of Methocarbamol Oral. How long does it take for 500mg methocarbamol to start working? I started taking it two days ago and I don't feel any difference. I had pre-existing back pain that I believed was caused from sitting in a chair for long hours at work. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. These side effects may go away during treatment as your body adjusts to the medicine. Is plaquenil with methocarbamol 500 mg Methocarbamol Robaxin - Side Effects, Dosage, Interactions., Common and Rare Side Effects for Methocarbamol Oral Leflunomide and plaquenil taken togetherHair loss hydroxychloroquine Aug 24, 2018 Methocarbamol is available in 500- and 750-milligram mg tablets. For adults with muscle stiffness, the typical dosage is 1,500 mg, four times daily. For adults with muscle stiffness, the typical. Is Methocarbamol a Narcotic? 11 FAQs About Dosage, Addiction, Mor. How long does it take for 500mg methocarbamol to start.. Methocarbamol Granules Pharmaceuticals Inc. FDA Package Insert. Be sure to get the pills that are just pure methocarbamol usually 500 mg and NOT the ones mixed with ibuprofen, aspirin, and especially acetaminophen. Methocarbamol seems to be harmless in therapeutic doses less than 2 or maybe 3 grams, and isn't known to cause severe damage when mixed with alcohol. Methocarbamol 500 mg tablet. color light orange shape round imprint G, 500 This medicine is a light orange, round, scored, film-coated, tablet imprinted with "G" and "500". ‹ Back to Gallery. Methocarbamol is a skeletal muscle relaxant with sedative effects. The exact mechanism of how methocarbamol works is not known. Methocarbamol is presumed to work by depressing the central nervous system, leading to relaxation of muscles. The FDA approved methocarbamol in July 1957.