Sangfroid,

If they are prescription drugs, how about the legality of carrying those drugs (obviously it depends on the quantity as well) inside the luggage?  You should clerify them about the safe carry of your medcine.

In my understanding, you are trying to have somebody hand over your medicine, which is difficult to get prescribed here,  in kathmandu and mail that after being at US.

Make everything clear if somebody is interested and good luck for your search.