What is the effect of taking two major tranquilizers, namely thorazine and haldol (haloperidol)?

Variety of Effects: I am not sure if you are asking about taking them together, or just their effects in general. On the positive side, these older antipsychotic medications can help to decrease hallucinations and bizarre thoughts. They can also decrease agitation. On the negative side, there are a variety of possible side effects, most common of which are sedation and various problems related to abnormal movements.