Potentiate the effects of lorazepam with otc. . . Drug-Drug Interactions of Common OTC DrugsSide effects that usually do not require medical . Posted: March 13 2007 Post subject: OTC . org » Discussion of Prescription and OTC Meds . . Levodopa may potentiate the . or even necrosis, which causes a further negative effect . . . . therapy, including prescription and OTC drugs . . so my question is does anybody know of any long term side effects . (opiates) clonazepam potentiate oxycodone? Other ... more