... , and swelling . Acetylsalicylic Acid, also known by trade name Aspirin, is an acetyl derivative of salicylic acid that is a ... in the relief of headache and muscle and joint aches. Aspirin is also effective in reducing fever, inflammation, and swelling ... does lower fever and relieve pain, is often substituted for Aspirin.Acetylsalicylic Acid is used in analgesics, anti-inflammatories, antipyretics, ...