Treatment of Tendinitis and Tenosynovitis Rest or immobilization, heat or cold, followed by exercise High-dose nonsteroidal anti-inflammatory drugs (NSAIDs) Sometimes corticosteroid injection Symptoms are relieved by rest or immobilization (eg, splint or sling) of the tendon, application of heat (usually for chronic inflammation) or cold (usually for acute inflammation), and high-dose NSAIDs (see table) for 7 to 10 days.