Loprin 150mg tablet is a non-steroidal anti-inflammatory drug (NSAID) that is used for the relief of mild to moderate pain, inflammation, fever, and headaches. It contains aspirin as the active ingredient. Aspirin works by inhibiting the production of prostaglandins, which are responsible for inflammation, pain, and fever. Loprin is commonly used for the treatment of conditions such as arthritis, menstrual cramps, toothache, and migraine. However, it is important to note that aspirin can cause serious side effects such as bleeding in the stomach or intestines, so it should be used with caution and only under the guidance of a doctor.