Final answer:
The word that completes the sentence is withdrawal. When a person who is addicted to drugs gives them up, they often suffer from withdrawal symptoms.
Step-by-step explanation:
The word that completes the sentence is withdrawal. When a person who is addicted to drugs gives them up, they often suffer from withdrawal symptoms. These symptoms occur when a drug user requires more and more of a given drug in order to experience the same effects. Physical dependence produces physical withdrawal symptoms, such as insomnia, tremors, pain, or seizures; while psychological dependence produces psychological withdrawal symptoms, such as anxiety, depression, paranoia, or hallucinations.