Not Medical Advice: We think that you are pertaining to the white capsule-shaped pill 6I (you must have read it upside down). It has been identified as Ibuprofen 600 mg.
Ibuprofen is a non-steroidal anti-inflammatory drug (NSAID). It works by reducing hormones that cause inflammation and pain in the body. Ibuprofen is used to reduce fever and treat pain or inflammation caused by many conditions such as headache, toothache, back pain, arthritis, menstrual cramps and more.
Headaches can be debilitating, but you can help keep the headache pain at bay. Check out some tips that can help you reduce frequent headaches at WebMD.