Algesal Cream is a treatment for muscle or rheumatic pain which helps to relieve aches and pains wherever they may be. It uses the active ingredient diethylamine salicylate, which helps to relieve pain, leaving you feeling relieved and comfortable. Algesal Cream contains the active ingredient diethylamine salicylate, which is a local analgesic. Analgesic medications are pain killers, and diethylamine salicylate works to relieve aches and pains in your muscles, soothing symptoms of conditions such as lumbago, fibrositis, and sciatica.