Cocaine is another drug that can make a person addicted to it, if taken over a long period of time. The affect of this drug can be seen on both the physical and mental health and these results can be devastating. Cocaine affects the nervous system badly and the patients who come to drug treatment center share their experience of restlessness, headaches and irritation when they do not get the drug. The drug treatment focuses relieving the patients from these sensations when they are not allowed to take cocaine and replace it with the medicines.