Type 2 diabetes mellitus (T2DM) is the metabolic disease with the highest morbidity rates worldwide. The condition is characterized by hyperglycemia, insulin resistance, hyperlipidemia, and chronic inflammation, among other detrimental conditions. These decrease the efficiency of the immune system, leading to an increase in the susceptibility to bacterial infections. Maintaining an optimal blood glucose level is crucial in relation to the treatment of T2DM, because if the level of this carbohydrate is lowered, the risk of infections can be reduced. Currently, this is achieved using synthetic drug treatments that seek to moderately inhibit digestive enzymes (e.g., α-amylase and α-glucosidase), such as acarbose, voglibose, miglitol, etc. However, the use of these compounds also generates unwanted side effects such as nausea, diarrhea, stomach aches and a loss of appetite. Therefore, there is an increasing demand to find effective and safe alternatives for treating T2DM, such as herbal treatments. As a result, there has been a search for possible drugs from plants with both antidiabetic and antibacterial activity. This study presents a review of the molecular and cellular mechanisms of T2DM, secondary effects of the disease such as bacterial infections, and general comprehension of synthetic and natural product treatments to help patients.