What kind of syrup?
Read the labels of any medicines you take, even over the counter. Some are expectorants (loosen phlegm), some add antihistamines (dry up secretions), some add cough
suppressants, some add fever
, and some add decongestants.
The latter can get you speedy on their own, add coffee and you can feel like you describe. Now you weren't taking cough medicine to get high, were you? Bad idea, .