Which of the following is an example of an over-the-counter medication?

Ibuprofen is a widely recognized over-the-counter medication primarily used for pain relief, reducing fever, and alleviating inflammation. Its accessibility without a prescription makes it a common choice among consumers for treating mild to moderate pain, such as headaches or muscle aches, as well as for its anti-inflammatory properties in conditions like arthritis.

In contrast, Amoxicillin is an antibiotic that requires a prescription, as it is used to treat bacterial infections and requires medical oversight. Prednisone is a corticosteroid medication that is typically prescribed for conditions such as autoimmune disorders and severe allergies, necessitating close monitoring due to potential side effects. Lisinopril is primarily a prescription medication for managing high blood pressure and heart failure, also requiring medical supervision. Therefore, ibuprofen stands out as the sole over-the-counter option among the listed medications.