Left side rib pain chooses different drugs according to different causes, common causes include rib fracture, pleurisy, costochondritis, infectious diseases, etc. You can choose drugs such as celecoxib, penicillin, acyclovir and so on. 1. Rib fracture: trauma such as fall and impact may cause rib fracture, resulting in rib pain, non-steroidal anti-inflammatory and analgesic drugs can be taken, such as celecoxib, ibuprofen and so on. 2. Pleurisy: Inflammation or infection of the lungs may cause inflammation of the pleura, resulting in pain on the surface of the nearby ribs, which can be treated with antibiotics such as penicillin. 3. Costochondritis: The attack of costochondritis can be manifested as severe pain in the ribs, which can be treated with antibiotics such as penicillin. 4. Infectious diseases: Infectious diseases such as herpes zoster can also cause rib pain if it occurs in the back of the chest, you can choose to take antiviral drugs such as acyclovir, famciclovir and so on. All of the above medications should be used under a doctor’s supervision. Rib pain on the left side can also be caused by other reasons, and should be treated in a timely manner in the hospital to identify the cause and provide targeted treatment.