Doctors have prescribed Dilantin to people over 65 for many years with good results. These seniors do have a few special problems, however.

Most seniors take more medicines than younger people, so there's a greater risk that the medicines may affect each other. Dilantin interacts with a number of medicines often used by seniors, such as warfarin (Coumadin) and aspirin.

Seniors also tend to be more sensitive than younger adults to medicines and their side effects. For instance, many seniors have a problem with unsteadiness even before they start taking Dilantin. Since it also can be a side effect of this medicine, the problem may become worse and cause real trouble, especially since seniors are more likely to be seriously hurt if they fall.

To reduce side effects, the doctor probably will prescribe a low dose of Dilantin to start and then be very cautious about any increases. It's especially important for seniors keep the doctor informed about any changes that they notice.

The bodies of older people do not always digest Dilantin completely, and it is more slowly eliminated. This means that it may be difficult to achieve a constant, appropriate level. As a rule, older people require smaller doses than younger adults and most of them need to take the pills only once a day.