This section provides information on the proper use of a number of products that contain ibuprofen.  It may not be specific to Motrin. Please read with care.
For safe and effective use of this medicine, do not take more of it, do not take it more often, and do not take it for a longer time than ordered by your doctor. Taking too much of this medicine may increase the chance of unwanted effects, especially in elderly patients .
When used for severe or continuing arthritis, this medicine must be taken regularly as ordered by your doctor in order for it to help you. This medicine usually begins to work within one week, but in severe cases up to two weeks or even longer may pass before you begin to feel better. Also, several weeks may pass before you feel the full effects of this medicine .
To lessen stomach upset, you may take this medicine with food or milk .
Dosing
The dose of this medicine will be different for different patients. Follow your doctor's orders or the directions on the label. The following information includes only the average doses of this medicine. If your dose is different, do not change it unless your doctor tells you to do so.
The amount of medicine that you take depends on the strength of the medicine. Also, the number of doses you take each day, the time allowed between doses, and the length of time you take the medicine depend on the medical problem for which you are using the medicine.
For oral dosage form (tablets and suspension):
For fever:
Children over 2 years of age—Use and dose must be determined by your doctor.
Children 6 months of age up to 2 years—Dose is based on body weight and body temperature, and must be determined by your doctor. For fever lower than 102.5 °F (39.2 °C), the dose usually is 5 milligrams (mg) per kilogram (kg) (about 2.2 mg per pound) of body weight. For higher fever, the dose usually is 10 mg per kg (about 4.5 mg per pound) of body weight. The medicine may be given every six to eight hours, as needed, up to 40 mg per kg per day.
Infants younger than 6 months of age—Use and dose must be determined by your doctor .
For menstrual cramps:
Adults—400 milligrams (mg) every four hours, as needed.
Children—Use and dose must be determined by your doctor .
For mild to moderate pain:
Adults and teenagers—400 milligrams (mg) every four to six hours, as needed.
Children over 6 months of age—Dose is based on body weight and must be determined by your doctor. The dose usually is 10 milligrams (mg) per kilogram (kg) of body weight every six to eight hours, as needed, up to 40 mg per kg per day.
Infants younger than 6 months of age—Use and dose must be determined by your doctor .
For osteoarthritis and rheumatoid arthritis:
Adults and teenagers—1200 milligrams (mg) up to 3200 mg per day divided into three or four equal doses.
Children—Dose is based on body weight and must be determined by your doctor. The dose usually is 30 milligrams (mg) to 40 mg per kilogram (kg) of body weight per day, divided into three or four doses.
Infants younger than 6 months of age—Use and dose must be determined by your doctor .
Missed dose
If you miss a dose of this medicine, take it as soon as possible. However, if it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Do not double doses.
Storage
Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light. Keep from freezing.
Ask your healthcare professional how you should dispose of any medicine you do not use.
Keep out of the reach of children.
Do not keep outdated medicine or medicine no longer needed.
 Detailed Motrin dosage information
