The biomedical approach is based on the assumption that if a neurochemical imbalance causes a disorder like OCD, drugs can be used to alleviate the symptoms. For example, genetic abnormalities that affect the neurotransmitter serotonin can increase vulnerability to OCD, thus drugs that increase serotonin levels - such as SSRIs - may be effective in reducing obsessive thoughts and compulsions.Initially, tricyclic antidepressants...