Drug Uses Generic Motrin is used for relief of the signs and symptoms of rheumatoid arthritis and osteoarthritis. It might also be used by your doctor in treatment of primary dysmenorrheal as he deems fit. Usage Following the dosage instructions of your doctor is the best way to use any medication. The dosage should not be more than 3200 mg a day. You may choose to take Generic Motrin with a meal or milk to avoid gastrointestinal toxicity. Drug Class and Mechanism Generic Motrin is classified as a NSAID. A certain type of chemical called prostaglandins (cyclooxygenase) is responsible for causing inflammation, pain and fever. Ibuprofen blocks the enzymes that produce prostaglandins thereby reducing inflammation, pain and fever. Missed Dose Despite your best attempts at remembering, if you still miss out on a dose, then take it as soon as you remember about it. But keep in mind that you will have to adjust your next dose by spacing it out by 4 to 5 hours. If this is not possible, then the best thing to do would be to skip the missed dose and continue with your normal dosage schedule. Never try to compensate for the missed dose by taking a double dose together. It may cause adverse effects. Storage Store Generic Motrin at room temperature, 20 to 25 degrees C (68 to 77 degrees F).