Five Ways to Satsify Patients in Less Time: "Put it in writing. For your patients who read, putting the simplest of instructions in writing enhances the likelihood that they will follow through on your advice. And you and your staff will save time spent on post-visit telephone calls, e.g. “What did Dr. Moore tell my husband he was supposed to do?”"
My preferred mode of communication with my patients is email. This way, everything is in writing, so the scope for errors and misunderstandings is much less. This is especially important when patients are flying to Bombay all the way from New York or London for IVF treatment !