Hello and welcome to Healthcare Magic.
The adult dose of Amoxycillin
is actually 500 mg three times a day. So, the dosage prescribed to you is not excessive. Pain below the ribs due to frequent coughing is quite common. So, your pain is most likely due to the muscle strain
due to the cough. You don't have to be worried about it as it will subside on its own within a few days. I would suggest that you continue the course of antibiotic for the prescribed time period. In addition, you can also take a cough syrup so that your cough subsides and the associated pain also gets relieved.
Dr. Sheeba Stephen