Hi: The cough medicine he prescribed for me is "hydrocodone compound syrup" (for Hycodan syrup) may cause drowsiness, says not to drive or use dangerous machinery, can't use alcohol. 1-2 tsp orally every 4-6 hours. I used it maybe 6 times, 2 tsp. the first couple of times, then 1 tsp. in a.m. and p.m. on the last of the 3 days I used it. I do take 2 eldepryls a day plus 1 25/100 sinemet. I did not have a bad reaction. I am very sensitive to medicine generally and avoid it as much as possible. When I questioned him about its safety, he said he has a lot of patients with Parkinson's and has prescribed it to them without any problems. I did not check any further, felt more reassured except that I am so sensitive, but I decided to try it. It did make me sleepy, and it did help!! Best, Liz S/