The nicotine patch is a common, low cost stop smoking aid.  Available by prescription, the nicotine patch delivers nicotine to the bloodstream via skin contact.  Though largely safe and effective, the nicotine patch should not be used by those on the following medications:•    Beta blockers•    Insulin•    Propoxyphene•    Xanthines•    Large doses of aspirin•    Ulcer medications•    Some antibioticsStop smoking aids frequently contain nicotine in time-release formula.  Nicotine has been shown to interact with some over-the-counter and prescription drugs.  For more information about the appropriate stop smoking aid for you, consult your family doctor.