Not Medical Advice: Did you mean 6I? Pill imprint 6I has been identified as Ibuprofen 600 mg.
Ibuprofen is a nonsteroidal anti-inflammatory drug (NSAID) used to treat mild to moderate pain, and helps to relieve symptoms of arthritis (osteoarthritis, rheumatoid arthritis, or juvenile arthritis), such as inflammation, swelling, stiffness, and joint pain. This medicine does not cure arthritis and will help you only as long as you continue to take it.
In addition, ibuprofen can be used to treat fever, menstrual cramps, and other conditions as determined by your doctor.This medicine is available both over-the-counter (OTC) and with your doctor's prescription.
US Brand Names: Addaprin, Advil, A-G Profen, Bufen, Genpril, Haltran, Ibu, Ibu-2, Ibu-200, Ibu-4, Ibu-6, Ibu-8, Ibuprohm, Ibu-Tab, I-Prin, Midol, Motrin, Nuprin, Proprinal, and Q-Profen.