13 Popular Medications That Could Be Draining Your Energy Levels

2. Antihistamines - More Than Just Allergy Relief

Antihistamines are commonly used to combat allergic reactions, providing relief from symptoms such as sneezing, itching, and runny nose. Despite their effectiveness, many antihistamines, particularly first-generation types like diphenhydramine, are notorious for causing drowsiness. This sedative effect stems from their ability to cross the blood-brain barrier and block histamine receptors in the central nervous system. While this action helps alleviate allergy symptoms, it can also induce a profound sense of fatigue. For those relying on antihistamines for allergy management, this side effect can significantly impact daily energy levels. Newer antihistamines, known as second-generation, are less likely to cause drowsiness, offering a potential alternative for those seeking to maintain their vitality.