What common side effect is expected with the use of Lomotil?

Lomotil, which contains diphenoxylate and atropine, is primarily used to treat diarrhea. One common side effect associated with its use is drowsiness. This occurs because diphenoxylate, a narcotic analgesic derivative, can depress the central nervous system, leading to sedation. Additionally, atropine, which is included to discourage misuse, can also contribute to feelings of drowsiness.

While other potential side effects of Lomotil may include dry mouth or constipation, drowsiness is a particularly notable effect, making it important for users to be cautious when performing tasks that require alertness, such as driving.