Final answer:
A person taking an anti-inflammatory drug for a torn muscle is most likely treating a muscle strain. This injury involves torn muscle fibers due to overstretching and can be treated with NSAIDs post-initial bleeding.
Step-by-step explanation:
If a person takes an anti-inflammatory drug to treat a torn muscle, the kind of injury that is most likely present is a muscle strain. A muscle strain is an injury where muscle fibers tear due to overstretching. A strain differs from a sprain, which involves the ligaments. Among other treatments, non-steroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen are often prescribed to reduce inflammation and relieve pain.
For a muscle strain, first aid may include the steps represented by the acronym PRICE (protection, rest, ice, compression, and elevation). Moreover, strains may present with symptoms such as pain, stiffness, and bruising. NSAIDs are recommended after the bleeding in the muscle has stopped, as they can interfere with blood clotting. Professional medical care might be necessary for severe muscle strains.