Chronic abuse of PCP can lead to a psychological and physical dependence on the drug, creating compulsive drug-seeking behavior and drug cravings. Repetitive use of PCP creates a physical dependence, and the brain will become tolerant to its effects, needing more of the drug each time in order to produce the same outcome. Users will then feel out of balance without PCP and seek the drug in order to maintain a feeling of normalcy. Excessive amounts of time will be spent obtaining, using, and recovering from PCP. Addicts will also suffer from withdrawal symptoms when PCP is not in their system; symptoms include depression, drug cravings, changes in appetite, anxiety, and lack of energy. Chronic PCP abuse can lead to serious and permanent brain damage and health concerns, so early intervention is important. PCP abuse can also mimic the symptoms of schizophrenia and cause psychosis as well as make symptoms of mental health disorders worse. The National Alliance on Mental Illness (NAMI) estimates that as many as 50 percent of all drug abusers also suffer from mental illness, and half of those suffering from a severe mental illness also abuse substances. Those suffering from a mental health disorder and a substance abuse disorder simultaneously are considered to have co-occurring disorders that require integrated and specialized treatment in order to promote a successful recovery of both disorders. When to Seek Help Some of the warning signs to watch for if you suspect PCP abuse include: Aggressive Behavior Blank Stare Decreased Coordination Dilated Pupils Drop in Work or School Performance Financial Difficulties Interpersonal Relationship Issues Impaired Sensory Perceptions Inability to Communicate Effectively Legal Trouble Outbursts of Violence Rapid and Uncontrollable Eye Movement Unpredictable Behavior Weight Fluctuations Withdrawal from Social Situations