Rituximab (Rituxan and MabThera) is a drug used to treat rheumatoid arthritis that has not improved with other types of medications, as well as certain forms of vasculitis. It works by turning off a part of the immune system that is not working properly in autoimmune diseases.
For the purpose of this sales tax exemption, âdirectlyâ means having an immediate effect on an item or in an activity, without an intervening, ancillary or prior effect.
Each state offers its own unique set of exemptions from its sales tax. In general, exemptions are provided on the based upon: 1  the type of property being sold, 2  the identity of the purchaser, or. 3  the use to which the property will be put.