However, several drugs are used in controlling T2D, and these drugs can be classified into seven main types based on their structures and mechanisms, including biguanides, sulfonylureas, thiazolidinediones, glucagon-like peptide (GLP-1), dipeptidyl peptidase (DPP-4) inhibitors, sodium-glucose co-transporter-2 (SGLT2) inhibitors and enzyme inhibitors. This evidence concerns the gene SLC5A2 and type 2 diabetes mellitus.