, says Lillian Min, an associate professor of geriatric and palliative medicine at the University of Michigan at Ann Arbor.One common offender is diphenhydramine, found in some over-the-counter cold medications and allergy drugs like Benadryl. Beta-blockers for high blood pressure, such as acebutolol and metoprolol , may also make you tired.
Older adults may be more likely to be dehydrated. “As you age, your thirst cues become blunted,” says Jessica Sylvester, a clinical dietitian and national media spokesperson for the Academy of Nutrition and Dietetics. As a result, you’re less likely to drink enough fluids, and one small study suggests that even minimal dehydration can cause fatigue, at least in young women.