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.
Your sales and leases of merchandise to the United States government are generally exempt from California sales and use tax. This includes sales and leases to: 1  The United States or its unincorporated agencies and instrumentalities.ales to federal contractors. Businesses working under contract to the federal government are usually not considered agents of the United States. Consequently, your sales to those contractors do not qualify as tax-exempt sales to the U.S. government.