What is the most appropriate treatment for insomnia in a patient concerned about future addiction?

Doxepin is a suitable choice for treating insomnia, particularly for patients who are concerned about the risk of future addiction. Doxepin is a tricyclic antidepressant that is used at low doses specifically for insomnia, and it has a sedating effect due to its antihistaminic properties. It offers an alternative to traditional benzodiazepines and non-benzodiazepine sleep aids, which often carry a higher risk of dependence and abuse.

The other options provided largely include medications that may have a higher potential for addiction. Zaleplon and Zolpidem are both non-benzodiazepine sleep medications that can be effective for short-term management of insomnia but may lead to dependence with long-term use. Flurazepam is a benzodiazepine that is associated with a greater risk of tolerance and addiction, which may not align with the patient's concerns about future addiction.

In conclusion, Doxepin serves as a safer alternative for patients worried about dependency, while still effectively addressing their insomnia.