Hello and hope you are doing well.
The liver enzymes like you mentioned could be raised due to medications. Alanine aminotranferease (ALT) and aspartate aminotransferase (AST) are enzymes located in liver cells that leak out into the general circulation when liver cells are damaged. AST (SGOT) and ALT (SGPT) are sensitive indicators of liver damage or injury. Normal values for SGOT is 0-35 and SGPT is 4-36, once you stop the medications it should normalize, recheck after four weeks.
A GFR of 90 - 120 mL/min is normal. Levels below 60 mL/min for greater than three months are a sign of chronic kidney disease. Please follow up and discuss this with your doctor am sure he will provide further assistance.
Hope this helped and do keep us posted.