Insulin lowers blood sugar by allowing it to leave the blood stream and enter the cells. People with type I diabetes cannot make their own insulin in the body and must take insulin injections to meet the regular requirement. They can survive without insulin injections, but many may take insulin injections to control blood glucose levels more effectively. Insulin is taken as an injection. Patients who need insulin is taught to give his/her injections themselves.
In type II diabetes, the patient's body makes insulin, but is not able to use it effectively. They use medicines to control blood sugar in the form of pills, usually once or twice a day. These medicines work by preventing the body from sending sugar into the bloodstream when the naturally produced insulin is not working properly, releasing more Insulin into the bloodstream, and helping the body's own insulin move glucose from the bloodstream into the cells. Some people need insulin in addition to oral medicines. Some people no longer need medicines if they lose weight because their own insulin output is sufficient after reducing weight, fat, and sugar.
Insulin is taken as an injection. It is not available in tablet form.