Methocarbamol is a muscle relaxant that is used primarily to treat skeletal and muscle conditions due to injury, according to Drugs.com, and "750 mg" refers to the dosage. The drug works by blocking nerve and pain impulses that the muscle sends to the brain.
Other conditions methocarbamol can be used for include muscles spasms and tetanus, according to Drugs.com. Common side effects associated with this substance include dizziness, drowsiness, headache, loss of memory or coordination, nausea, upset stomach, insomnia, or mild itching. Individuals should stop taking methocarbamol and call a doctor if they experience symptoms such as fever, chills, slow heart rate, jaundice or if they feel like they will pass out. Anyone who experiences difficulty breathing, hives, or swelling of the face or mouth, should seek immediate medical attention.