Unfinished prescribed medication happens mostly due to the irresponsible behavior of patients. The effect of interrupted treatment course depends on the type of medication. With some drugs, the worst aftermath would be the complete absence of any medical effect. On the one hand, it may look like nothing dangerous, however, it could be most unfortunate for people who took costly drugs and did not use them as prescribed. In this case, people shall pay twice to start the course from the very beginning and let it pass to the end.
An improper intake of antibiotics will have much more dramatic consequences for the patients. It is not a rare case when the patient feels sufficient relief yet before the course of medication is completed and decides not to abuse their organism with chemicals. However right it may seem, bacteria have specific time ramifications to be killed by antibiotics. Thus, the patient may think that they are healthy when bacteria which caused their disease only slowed its activity.
Improper intake of antibiotics causes habituation of bacteria to a certain medication. Microorganisms which has not been killed mutate immediately and make up new germs which are resistant to the medicine which did not kill them entirely. This is a major concern of the pharmacists who constantly work on the development of new antibiotics which will be able to kill the resistant bacteria.