19 yo cousin takes these: naproxen, levothyroxine, gabapentin, propanolol, & allegra (fexofenadine). She is considering taking st. John's wart as well. Is this safe?

Not a podiatry ? Direct this to your family doctor.
Appears safe. Thre are some relative interactions of two of the drugs already being taken. Naproxen may increase the blood levels of gabapentin. Some caution advised with the use of Naproxen with Propranolol (may decrease the effectiveness of propranolol) but no known probem of st. Johns wort with any of the medications. As wilth all medicatons check first with your pcp, specialist physician or pharmacist.