Valtrex ingredients? Compounding?

[Guest guest]

Can anyone tell me all the ingredients in commercial Valtrex? My son

is very allergic and we need to consider whether he can take these.

If he is allergic to say, the tiny amounts of casein in the lactose

that may be in the pills, or any soy-derived ingredients, what options

are there? Am I correct in understanding that Valtrex is still under

patent and cannot be compounded? Has anyone had a transdermal

formulation made?

Thanks,

Suzanne