after oral administration of metformin tablets , drug recovery in urines was only 37.6 % , possibly not as a consequence of low bioavailability ( a similar low recovery was found after oral administration of the metformin solution used for the intravenous studies ) , but of binding to the intestinal wall , as shown in animal and clinical studies with metformin and other biguanides .
C0025598
metformin
C0005382
biguanides