Explain how double- blind studies researchers evaluate a drug's effectiveness, and describe the use of antipsychotic, antianxiety, antidepressants, and mood-stabilizing drugs in treating psychological disorders

The study of drug effects on mind and behavior is called psychopharmacology, it helps make drug therapy the most widely used biomedical therapy.
The drugs that use in treating schizophrenia is antipsychotic drugs. Antianxiety drugs, which depress central nervous system activity, are used to treat anxiety disorders, obsessive-compulsive disorder, and post-traumatic stress disorder. These drugs can be physically and psychologically addictive.
Antidepressant drugs used for depression with a modest effectiveness beyond that of placebo drugs. It is known as selective serotonin reuptake inhibitors are now used to treat other disorders including strokes and anxiety disorders. Lithium and Depakote are mood stabilizers prescribed for those who have bipolar disorder.