If i overdose on neo-synephrine, what will happen?

Heart effects: Symptoms of Neo-Synephrine overdose include rapid heart rate, irregular heart rate, palpitations, anxiety, hallucinations, abdominal cramps, diarrhea, vomiting & sweating. Your nose may sting a lot. Not everyone gets all of these symptoms. Neo-synephrine is a highly addictive drug & should not be used routinely. There are better medications for treating your chronic symptoms. See your doctor.

Nasal Problems: In addition to dr. Machtinger's answers, neosynephrine nose drops if overused can result in a paradoxical swelling of the tissue within the nasal passages that may cause severe discomfort, worse than the original problem. This may be very difficult to correct as it does not disappear when the drops are stopped.