<qa>  What is the name of the drug that is used to describe the drug?18. If not using duloxetine Cymbalta, any antidepressants e.g. amitriptyline and venlafaxine, any other antiepileptics e.g., valproic acid, carbamazepine, vigabatrin, subjects must agree not to start these drugs for the first 6 months of the study. 