Anti-inflammatory drugs can be classified into two main categories: steroidal and non-steroidal anti-inflammatory drugs (NSAIDs). Steroidal drugs are commonly used to relieve inflammation, swelling, and pain in conditions such as arthritis and asthma, while NSAIDs are primarily used to relieve pain and inflammation associated with headaches, muscle aches, and menstrual cramps. Some common NSAIDs include ibuprofen, aspirin, and naproxen.