I took this product a while back for mild coughing and the Normethdane was like a stimulant to me back when i was 17 and i had head shakes and hand shaking along with tremors. That night i went to the hospital cuz they had told me 5 drops every night. Apparently this amount of drops is wayyyy too much for a person my age and they told me i needed to go do a blood test and it was really annoying to go through all that