Abnormal psychology is the clinical study or treatment or branch of the psychology study that is related to the psychopathology that include the mental disorder or illness and their cause that could be biological, social disorganization, genetically and others.
Obsessive compulsive disorder and depression is the example of such mental illness that is deal under these branches of clinical psychology.
Well, there are those medications on TV on ads, where they ALWAYS have these "side-effects", and the MAJORITY of them include heart-pain. I hope I helped! :-)