Which of the following can be an indication of a potential drug interaction?

Increased side effects and changes in vital signs can be crucial indicators of a potential drug interaction. When medications interact, they may enhance or diminish each other's effects, leading to unexpected side effects. For instance, if two medications that have sedative properties are taken together, the user may experience excessive drowsiness, which is a side effect. Similarly, an interaction could also lead to changes in vital signs like heart rate or blood pressure.

Monitoring these changes is vital as they can signal an unsafe combination of medications, warranting immediate evaluation and potential adjustment of the treatment plan by healthcare professionals. Other symptoms or experiences, such as stable moods or consistent vital signs, do not suggest the presence of drug interactions. Instead, they indicate that the medications may be working effectively without adverse interactions.