Intramuscular pain relief injection is usually divided into two types, that is, antipyretic and anti-inflammatory drugs and central analgesics, of which the main antipyretic and anti-inflammatory drugs are lysergic acid injection, diclofenac sodium injection or Anacin injection, which are usually applied to systemic joint pain caused by sterile inflammation, or muscle pain caused by fever, and the effect is relatively good. The other is the central analgesic, mainly acting on the central nervous system, reducing the pain threshold and thus producing effects, commonly used are cranial pain, tramadol, diazoxide, dulcolax, morphine and other drugs. Generally, for moderate pain, cranial analgesics and tramadol can be used, but for severe pain, such as renal colic or pain caused by cancer, diazoxide, morphine or dulcolax must be used.