NSAIDs are drugs that help to treat inflammation. These drugs act on some of the same biochemical pathways as steroids, but are both less potent, and have fewer side effects than steroids. Many of these drugs are well known and available over the counter, including ibuprofen (Advil), naproxen (Naprosyn) and aspirin, but there are several NSAIDs which are less well known. These drugs are often useful adjuncts in treating ocular inflammatory conditions such as scleritis and uveitis.
Like all drugs, NSAIDs have side effects that can be dangerous, most notably stomach irritation. Prolonged NSAID use may necessitate therapy with drugs that prevent gastritis or peptic ulcers.
The American College of Rheumatology has an excellent webpage on nonsteroidal drugs.