Final answer:
Document Selma's weight loss after starting topiramate and discuss its implications, considering whether it's a beneficial side effect or if there are health concerns.
Step-by-step explanation:
The appropriate action when noting that Selma, who is overweight and has recently started taking topiramate for seizures, has lost 3 kg, would be to document the weight loss and discuss it with her. Topiramate is known to cause weight loss in some individuals. Considering Selma's baseline weight, a loss of 3 kg might be significant, but it is also important to assess whether the weight loss is a beneficial side effect given her overweight condition or if it poses any health concerns. A healthcare professional should evaluate her overall health, the effectiveness of the seizure control, and consider if any behavioral interventions are needed to help her achieve and maintain a healthy weight.