Hey Everyone, Why do they make you sleepy? These medications are "first-generation" antihistamines, meaning they easily cross the blood-brain barrier and interact with histamine receptors in your brain that regulate wakefulness. By blocking these, they make you feel drowsy. They also often have "anticholinergic" effects that contribute to sedation and other side effects like dry mouth. Important Note: Because these medications cause drowsiness, it's crucial to never drive or operate heavy machinery after taking them. Avoid combining them with alcohol or other sedatives, as this can dangerously increase sedation. They are generally recommended for nighttime use or when you can safely afford to be drowsy. For daytime allergy relief, "non-drowsy" second-generation antihistamines (like loratadine, cetirizine, or fexofenadine) are usually preferred. Visit : https://buymedlife.com/blog/allergy-medication-that-makes-you-sleepy