Yes, reducing your doses of Nexito (escitalopram) and clonazepam can indeed cause these symptoms. Decreasing these medications can trigger withdrawal effects, including tingling or altered sensations in your hands and fingers, as well as increased muscle tension or jaw clenching, which might feel like tooth pain. Since you mentioned pain in your left hand, it is very important to have your ECG reviewed by a doctor to rule out any heart-related concerns, even though these symptoms are likely linked to your medication adjustment. Please share your ECG results with your healthcare provider as soon as possible so they can safely guide your dose reduction.