Answer:
Drug tolerance.
Step-by-step explanation:
Drug tolerance occurs when an individual has taken drugs at a certain dosage continuously, causing its effects to decrease over time. Thus, to create the same effects, the individual must increase their dosage.
Unfortunately, a side effect from doing this is the possibility of drug dependence or addiction. However, it is possible manage the drug use responsibly to avoid drug tolerance by taking drug holidays - when an individual chooses to not take his or her drugs to decrease the risk of tolerance.