intramuscular medication

例句：

1. 1. This medication is for treating muscle pain after an intense workout.
   这种药物用于治疗剧烈运动后的肌肉疼痛。
2. 2. The doctor administered the intramuscular injection to the patient.
   医生给病人进行了肌肉内注射。
3. 3.Intramuscular injections are often used to treat infections in the muscles.
   肌肉内注射常用于治疗肌肉感染。