Best Answer: Yes, they are two different medications that treat two different symptoms. Careful with the clonazepam because it can be very addictive. Use the smallest dosage possible for the therapeutic result you desire. The Clonazepam works quickly but the lexapro takes more time to work. Lexapro can take 6 weeks to help with anxiety and depression. clonazepam will work in about half an hour. It is actually an anticonvulsant (Used to treat seizures) that has tranquilizing properties. EDIT: Since you have racing thoughts, it is possible that you have bipolar disorder and not anxiety and depression alone.