Diclofenac sodium extended-release tablets are long-acting pain relievers, which usually take effect after 2-3 hours of administration. Diclofenac sodium extended-release tablets are non-steroidal anti-inflammatory and analgesic drugs, mainly used for sterile chronic inflammatory diseases, such as osteoarthritis, lumbar strain, tenosynovitis, etc. The pain-relieving effect is very significant, which usually takes effect 2-3 hours after taking, and the effect will continue for about 12 hours. The most common side effect is gastrointestinal reaction, which may lead to abdominal pain and stomach discomfort, so patients with combined digestive system diseases and gastric ulcer should not take it as much as possible. At the same time, patients need to pay attention to the dose selection, not to take the combination of drugs, continuous use of drugs is not recommended for more than two weeks. Therefore, the clinical use of diclofenac sodium extended-release tablets requires strict compliance with medical advice and clear contraindications and indications for the drug to obtain the best results.