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Robaxisal: Extra Strength Caplets. Robaxisal Extra Strength pain relief medication for temporary relief of pain associated with muscle spasm such as back pain, tense neck muscles, sprains, and strains. The #1 Pharmacist recommended brand, Robax features a unique dualaction formula that gets to the source of back pain by relaxing tight muscles providing effective relief of both back pain and muscle spasms. Robaxisal Extra Strength caplets contain 500 mg of Acetylsalicylic Acid (ASA) to relieve pain and 400 mg of Methocarbamol to relax tense back muscles. Directions: Adult dosage (12 years and older): 2 caplets, every 6 hours. Do not exceed 8 caplets in 24 hours. Use only on the advice of a physician. Not a standard dosage unit. Medicinal Ingredients: Each caplet contains: Methocarbamol (muscle relaxant): 400 mg, Acetylsalicylic acid (analgesic): 500 mg Non-medicinal Ingredients: Corn starch, hypromellose, magnesium stearate, methylcellulose, modified starch, polyethylene glycol, povidone, sodium lauryl sulfate, sodium starch glycolate, stearic acid.