will have to continue the search, i guess
This drug does not, in and of itself, make one sleepy.
It is often combined with medications for pain or for cold or allergy symptoms, and those
may make one sleepy.
It is my belief that you can search all you want, but you will not find anything different.
May I make three suggestions that will at least abbreviate your search process?
1) Look the drug up in your drug book. Look especially in the area of adverse effects or complications. Liver damage will be there, but not sleepiness.
2) Look at the insert provided by the manufacturer and included in the drug's packaging. You probably will not find anything about drowsiness there.
3) Ask a professional face to face: a nurse you know and trust, or perhaps your own physician. This may be especially helpful, since it seems you are rather convinced that the drug has this effect and that person may be able to clarify whatever it is that has contributed so strongly to your opinion.
Any drowsiness resulting from giving this drug is due to the giving
of the drug, not the drug itself. This is the "placebo" effect, and can be a very strong factor. It arises from the patient's trust in the medication and in the person administering it (so if this has been happening when you give this drug to your patients, you can consider that a sort of compliment!).
If you should
find that this drug causes sleepiness, I hope you will post your findings (and citation, of course) on this BB.