There are many reasons to be honest with the person that does your DOT Physical.
Do not falsify an application! It will come back to haunt you. You may be able to drive if you do not take one of the 5 drugs you will be tested for.
(I have the list in my office and will try to post it tomorrow). Also you are subject to random drug and alcohol testing everyday.
I suggest you talk with your doctor and ask that he/she do your DOT Physical if the doc is DOT approved.
If you plan to go to driving school you need the DOT physical and the school will require a Level-5 drug test at their MRO. You are also subject to random drug and alcohol testing while in school. Schools are under the same law as carriers when it comes to DOT Testing.
I don't want to discourage you. Ask your doctor if it is safe for you to drive a commercial motor vehicle. If the answer is yes that's a good start.
I send people for DOT Level-5 drug test everyday. Ask the collector if they want a list of meds you take. Some will take the information, some will not. My collection company works for the lab and will not take medical information. The MRO will contact you if your test is positive. You will have the opportunity to discuss your test results with him/her.
You can look up driver physical requirements at
Federal Motor Carrier Safety Administration
Good luck and be safe.