Motrin IB is a brand name for ibuprofen, a nonsteroidal anti-inflammatory drug (NSAID) used to relieve pain and reduce fever. It works by blocking the production of prostaglandins, substances in the body that cause pain and inflammation.  

Common uses of Motrin IB include:

• Headaches
• Muscle aches
• Back pain
• Arthritis pain
• Dental pain
• Menstrual cramps
• Fever

Important considerations when using Motrin IB:

• Overdose: Avoid overdosing on ibuprofen, as it can cause stomach bleeding and other serious side effects.
• Stomach irritation: Ibuprofen can irritate the stomach lining, especially in people with a history of stomach ulcers or gastritis.
• Interactions: Ibuprofen may interact with other medications, such as blood thinners and certain heart medications.
• Pregnancy and breastfeeding: Consult a doctor before using ibuprofen if you are pregnant or breastfeeding.