This is a very common problem that a lot of people do not account for. When there are issues with medications it is important that you go to see a doctor who is also a gerontologist. Gerontologists have a better understanding of the effects and side effects that medications have on elderly people.
They will also know when medications are contra-indicated and can tell you if you should be taking vitamin supplements or over the counter medicines. Pharmacists also should know when medications conflict and cause problems. Before contacting anyone make list of all medications that are being taken. Together you should be able to put together a plan for you or the one you are caring for.