The patient should not use this drug if he is being treated with methylene blue injection or if he also takes pimozide, if you have taken an MAO inhibitor in the past forteen days. MAO inhibitors include linezolid, isocarboxazid, tranylcypromine, phenelzine, selegiline,rasagiline. A dangerous medicines interaction could occur. Some young patients have thoughts about suicide when first taking an Lexapro. Becaus while the patient is using Lexapro, his doctor will need to check him progress at regular visits . The patient's relatives should also be alert to changes in his symptoms or mood.