ctconcerned,
A patient's medicine regimen should be discussed with the patient's physician. Sometimes, a patient's condition requires medicines to be used in ways that are not standard or are considered "off label".
It would be ill advised to offer recommendations or even opinions without knowing the patient's history, symptoms, physical exam, response to medicines and treatments.
However, for general information on the medicines and their possible interactions (not necessarily as they would apply to any one patient), you can always ask a pharmacist or use one of the many drug interaction websites available on the internet.
Good luck. Hope your relative is feeling better.